Materials Today Physics最新文献_第3页

Lasagne-like Bi2O3/Bi dual-carbon composites for high-capacity and long-life lithium storage 宽面条状Bi2O3/Bi双碳复合材料用于高容量和长寿命锂存储

IF 9.7 2区材料科学

Materials Today Physics Pub Date : 2025-09-20 DOI: 10.1016/j.mtphys.2025.101862

Yuhan Li , Xinmei Liu , Gang Liu , Dongbo Wang , Yicheng Feng , Mingyang Wu , Yuewu Huang , Liancheng Zhao

{"title":"Lasagne-like Bi2O3/Bi dual-carbon composites for high-capacity and long-life lithium storage","authors":"Yuhan Li , Xinmei Liu , Gang Liu , Dongbo Wang , Yicheng Feng , Mingyang Wu , Yuewu Huang , Liancheng Zhao","doi":"10.1016/j.mtphys.2025.101862","DOIUrl":"10.1016/j.mtphys.2025.101862","url":null,"abstract":"<div><div>Bismuth, as an alloy-type anode material for lithium-ion batteries, demonstrates high specific capacity and volumetric energy density. Nonetheless, the substantial volume expansion and capacity fade arising from prolonged charge-discharge cycling have impeded its commercial implementation. In this study, we constructed graphene, amorphous carbon layer double-coated Bi<sub>2</sub>O<sub>3</sub>/Bi composites (Gr@Bi<sub>2</sub>O<sub>3</sub>/Bi@AC) with approximate lasagna structure as anode for lithium-ion batteries. The incorporation of Bi<sub>2</sub>O<sub>3</sub> not only facilitates lithium-ion adsorption but also mitigates volume fluctuations via conversion reactions. Multilayer graphene increases the specific surface area and enhances ion/electron transport, while its combination with amorphous carbon provides robust dual-layer protection and structural integrity. As a result, the Gr@Bi<sub>2</sub>O<sub>3</sub>/Bi@AC anode delivers a high initial coulombic efficiency (69.3 %), remarkable rate performance (466 mAh g<sup>−1</sup> at 2000 mA g<sup>−1</sup>), and outstanding long-term cycling stability (1012.1 mAh g<sup>−1</sup> at 500 mA g<sup>−1</sup> over 500 cycles). This work provides a novel design to cope with the capacity decay of Bi-based materials by optimizing the dual carbon layer structure and multi-component synergistic engineering. The obtained conclusion would provide an innovative approach to design anode materials with both high capacity and stability.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"58 ","pages":"Article 101862"},"PeriodicalIF":9.7,"publicationDate":"2025-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145089181","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tunable properties of carbonitride Ti3C2-yNyTx MXene with varying N contents 碳氮化物Ti3C2-yNyTx MXene随N含量变化的可调性质

IF 9.7 2区材料科学

Materials Today Physics Pub Date : 2025-09-20 DOI: 10.1016/j.mtphys.2025.101870

Weiwei Zhang , Shibo Li , Xuejin Zhang , Qi Shi , Zhiyi Zhao

{"title":"Tunable properties of carbonitride Ti3C2-yNyTx MXene with varying N contents","authors":"Weiwei Zhang , Shibo Li , Xuejin Zhang , Qi Shi , Zhiyi Zhao","doi":"10.1016/j.mtphys.2025.101870","DOIUrl":"10.1016/j.mtphys.2025.101870","url":null,"abstract":"<div><div>Ti<sub>3</sub>C<sub>2-y</sub>N<sub>y</sub>T<sub>x</sub> is a two-dimensional (2D) titanium carbonitride in the MXene family, and exhibits tunable physicochemical properties via varying N content. So far, most studies have focused on the synthesis and properties of Ti<sub>3</sub>CNT<sub>x</sub> (y = 1), while the impact of N/C ratio on the properties of Ti<sub>3</sub>C<sub>2-y</sub>N<sub>y</sub>T<sub>x</sub> has not been previously reported, possibly due to the difficult preparation of Ti<sub>3</sub>AlC<sub>2-y</sub>N<sub>y</sub> precursors. In the present study, high-quality Ti<sub>3</sub>AlC<sub>2-y</sub>N<sub>y</sub> MAX precursors were achieved, and the corresponding 2D Ti<sub>3</sub>C<sub>2-y</sub>N<sub>y</sub>T<sub>x</sub> MXene flakes were obtained through the HF-etching method. Systematic analysis revealed that varying N content modulates lattice parameters, electrical conductivity, magnetism, and electromagnetic wave (EMW) absorption. Notably, N introduction induces them with room-temperature magnetism, and the synergy of magnetic and dielectric losses enables outstanding EMW absorption across S-, C-, X-, and Ku-bands. This study provides new insights into the controllable synthesis and electromagnetic property regulation of carbonitride MXenes, highlighting their great potential in EMW absorption applications.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"58 ","pages":"Article 101870"},"PeriodicalIF":9.7,"publicationDate":"2025-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145089179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Stabilized negative capacitance for near-theoretical efficiency and high reliability in charge trap flash memory 稳定负电容在电荷阱快闪存储器中的接近理论效率和高可靠性

IF 9.7 2区材料科学

Materials Today Physics Pub Date : 2025-09-19 DOI: 10.1016/j.mtphys.2025.101865

Sangho Lee , Giuk Kim , Yunseok Nam , Yangjin Jeong , Hyunjun Kang , Woongjin Kim , Hunbeom Shin , Mincheol Shin , Sanghyun Park , Kwangyou Seo , Kwangsoo Kim , Wanki Kim , Daewon Ha , Jinho Ahn , Sanghun Jeon

{"title":"Stabilized negative capacitance for near-theoretical efficiency and high reliability in charge trap flash memory","authors":"Sangho Lee , Giuk Kim , Yunseok Nam , Yangjin Jeong , Hyunjun Kang , Woongjin Kim , Hunbeom Shin , Mincheol Shin , Sanghyun Park , Kwangyou Seo , Kwangsoo Kim , Wanki Kim , Daewon Ha , Jinho Ahn , Sanghun Jeon","doi":"10.1016/j.mtphys.2025.101865","DOIUrl":"10.1016/j.mtphys.2025.101865","url":null,"abstract":"<div><div>Negative capacitance (NC) in ferroelectric heterostructures offers a promising pathway to internal voltage application for energy-efficient electronics. However, its adoption in non-volatile memory has been hindered by instability and limited endurance. Here, we demonstrate a stabilized NC-enhanced charge trap flash (NC-CTF) memory that simultaneously achieves high programming efficiency, long retention, and robust cycling endurance through dual interfacial engineering. An ultrathin Al<sub>2</sub>O<sub>3</sub> interlayer in Hf<sub>0.5</sub>Zr<sub>0.5</sub>O<sub>2</sub> (HZO) modulates domain configurations and promotes energy redistribution into depolarization energy, reinforcing the NC effect. Simultaneously, a TiO<sub>2</sub> layer between the charge trap layer (CTL) and blocking oxide (BO) increases the conduction band offset, suppressing parasitic charge injection and degradation. As a result, the NC-CTF device achieves a near-ideal incremental step pulse programming (ISPP) slope of ∼0.95, a 13.4 V memory window enabling quad-level cell (QLC) operation, and endurance exceeding 10<sup>4</sup> program/erase cycles. The integration of NC physics with flash memory architecture offers a scalable and CMOS-compatible platform for ultra-low-power memory and neuromorphic computing, contributing to the advancement of energy-efficient and intelligent nano-electronic systems.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"58 ","pages":"Article 101865"},"PeriodicalIF":9.7,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145083661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The C/N ratio as a lever for infrared properties tuning in carbonitride MXenes 碳氮比作为碳氮化物MXenes红外特性调整的杠杆

IF 9.7 2区材料科学

Materials Today Physics Pub Date : 2025-09-18 DOI: 10.1016/j.mtphys.2025.101860

Kevin Kim , Tetiana Parker , B. Moses Abraham , Teng Zhang , Aurélien Bruyant , Jérémy Mallet , Yury Gogotsi

{"title":"The C/N ratio as a lever for infrared properties tuning in carbonitride MXenes","authors":"Kevin Kim , Tetiana Parker , B. Moses Abraham , Teng Zhang , Aurélien Bruyant , Jérémy Mallet , Yury Gogotsi","doi":"10.1016/j.mtphys.2025.101860","DOIUrl":"10.1016/j.mtphys.2025.101860","url":null,"abstract":"<div><div>MXenes have demonstrated a broad range of properties in the infrared (IR) range being either efficient thermal emitters of IR light, or highly reflective, similar to polished metals. A combination of tunable IR reflectivity with the unique physical and chemical properties of MXenes, such as low thermal conductivity and efficient light-to-heat conversion, offer opportunities for a range of applications. However, one needs to know the effect of elemental composition, particularly carbon and nitrogen content, to obtain IR properties meeting the needs of specific applications. This work investigates the tunability of properties in titanium carbonitride MXenes by varying their carbon-to-nitrogen ratio across four distinct compositions (2C:0N, 1.75C:0.25N, 1.5C:0.5N, and 1C:1N). Multiple experimental characterization techniques, including X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, and thermal emissivity measurements, were combined with density functional theory (DFT) calculations to understand the influence of C/N ratio on infrared properties. The study reveals that the C/N ratio significantly affects the IR response of MXenes in the 1-<span><math><mrow><mn>25</mn><mspace></mspace><mi>μ</mi><mi>m</mi></mrow></math></span> range. Higher carbon content enhances IR reflectance, supporting superior thermal management and IR stealth, while increased nitrogen content elevates the emissivity and alters the phonon absorption bands. These findings demonstrate that C/N ratio modulations enable precise tuning of IR properties in titanium carbonitride MXenes, making them promising materials for thermal management, sensing, and multispectral electromagnetic shielding applications.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"58 ","pages":"Article 101860"},"PeriodicalIF":9.7,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145078524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Screw symmetry induced low-frequency optical phonons in heat-insulating CsCu2I3 绝热CsCu2I3中螺旋对称诱导的低频光学声子

IF 9.7 2区材料科学

Materials Today Physics Pub Date : 2025-09-17 DOI: 10.1016/j.mtphys.2025.101868

Qingyu Bai , Zhiwei Chen , Changyuan Li , Siu Ting Tai , Chen Wang , Te Kang , Shuxian Zhang , Yue Chen , Wan Jiang , Jun Luo , Yanzhong Pei

{"title":"Screw symmetry induced low-frequency optical phonons in heat-insulating CsCu2I3","authors":"Qingyu Bai , Zhiwei Chen , Changyuan Li , Siu Ting Tai , Chen Wang , Te Kang , Shuxian Zhang , Yue Chen , Wan Jiang , Jun Luo , Yanzhong Pei","doi":"10.1016/j.mtphys.2025.101868","DOIUrl":"10.1016/j.mtphys.2025.101868","url":null,"abstract":"<div><div>The existence of low-lying local vibrational modes is critical for increasing phonon scattering channels, thus leading to a significant enhancement in heat insulation of crystals. Proven mechanisms include rattling vibrations in clathrates and skutterudites, and ferroelectric instability in chalcogenides, of which the low-frequency optical phonons are generated by characteristic vibrations of either an individual atom or an atom pair. Here, we report a mechanism for forming low-lying vibrational modes, in which the screw symmetry of the lattice triggers the low-frequency vibrations of certain atom groups. As typified in CsCu<sub>2</sub>I<sub>3</sub>, the screw-operated iodine atoms at the crystallographic 8<em>g</em>-site induce two sets of low-frequency optical modes, which eventually results in a low-lying vibrational mode of 0.4 THz. The resultant intrinsic thermal conductivity of ∼0.35 W/m-K in single-crystalline CsCu<sub>2</sub>I<sub>3</sub> is further reduced to 0.22 W/m-K in poly-crystalline counterpart at room temperature. This is in consistent with the computational glass-like thermal conductivity obtained in previous studies focusing on the dimensional confinement effects and Cu ion migration confinement effects. Since the screw operations commonly exist in many materials, this work might offer new opportunities for advancing heat insulators.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"58 ","pages":"Article 101868"},"PeriodicalIF":9.7,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145072292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Harnessing room-temperature magnetocaloric effect in hexagonal full-Heusler-like alloy Mn2(Ti0.2Fe0.8)Sn: Paving the way for next-generation applications 利用六方全类赫斯勒合金Mn2(Ti0.2Fe0.8)Sn的室温磁热效应：为下一代应用铺平道路

IF 9.7 2区材料科学

Materials Today Physics Pub Date : 2025-09-17 DOI: 10.1016/j.mtphys.2025.101864

Sourav Mandal, Palash Nandi, Tapan Kumar Nath

{"title":"Harnessing room-temperature magnetocaloric effect in hexagonal full-Heusler-like alloy Mn2(Ti0.2Fe0.8)Sn: Paving the way for next-generation applications","authors":"Sourav Mandal, Palash Nandi, Tapan Kumar Nath","doi":"10.1016/j.mtphys.2025.101864","DOIUrl":"10.1016/j.mtphys.2025.101864","url":null,"abstract":"<div><div>Room temperature (RT) large cooling power per unit volume, high working temperature span, and moderate magnetocaloric response (MCR) across Curie temperature is achieved in high-quality polycrystalline half-metallic Full Heusler Like Alloy (FHLA): Mn<sub>2</sub>(Ti<sub>0.2</sub>Fe<sub>0.8</sub>)Sn. At RT, this FHLA exhibits an exceptional Mg<sub>3</sub>Cd (or Ni<sub>3</sub>Sn) type hexagonal structure (Space group <em>P</em>6<sub>3</sub>/mmc, no. 194, Strukturbericht designation-D0<sub>19</sub>) instead of cubic, as confirmed by Raman and X ray diffraction study. A unique, exotic microstructural feature, which is rarely observed in the case of Full Heusler Alloy (FHA), is revealed. DSC (Differential Scanning Calorimetry) and magnetic measurements confirm the Curie temperature to be near the room temperature. The calculated value of the RWR (Rhodes-Wohlfarth Ratio) = 2.759 (>1), signifies that the system exhibits characteristics of an itinerant ferromagnet. For 6 T (Tesla) magnetic field change, across its Curie temperature, this FHLA delivers a working temperature span (ΔT<sub>FWHM</sub>) as high as ∼ 20 K, a significant refrigerant capacity (RC) of 285.51 mJ cm<sup>−3</sup> and; relative cooling power (RCP) of 295.70 mJ cm<sup>−3</sup>, indicating its potency to be utilized in miniaturized engineering design in technology for its low constituent cost, low coercivity, an easy sample synthesis technique, and ability to exhibit substantial cooling power in a minimal volume. Furthermore, this refrigerant could serve as a viable substance for regulating the liquefaction and solidification processes of these harmful VOCs (Common volatile organic compounds) near room temperature. This finding, undoubtedly, enlightens understanding of complex magnetic behaviour and significant MCR effects in FHA, having an unusual exceptional structure, a unique microstructural morphology, and a Curie temperature in the proximity of RT.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"58 ","pages":"Article 101864"},"PeriodicalIF":9.7,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145078525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fabry-Pérot cavity-engineered smart windows with enhanced dynamic radiative cooling and solar modulation 具有增强动态辐射冷却和太阳调制的腔体工程智能窗

IF 9.7 2区材料科学

Materials Today Physics Pub Date : 2025-09-16 DOI: 10.1016/j.mtphys.2025.101866

Chong Wang , Jian Wang , Xiaoyu Sun , Zuoxu Wu , Fangyuan Yu , Zirui Zhao , Jun Mao , Qian Zhang , Feng Cao

{"title":"Fabry-Pérot cavity-engineered smart windows with enhanced dynamic radiative cooling and solar modulation","authors":"Chong Wang , Jian Wang , Xiaoyu Sun , Zuoxu Wu , Fangyuan Yu , Zirui Zhao , Jun Mao , Qian Zhang , Feng Cao","doi":"10.1016/j.mtphys.2025.101866","DOIUrl":"10.1016/j.mtphys.2025.101866","url":null,"abstract":"<div><div>The passive dynamic radiative cooling (PDRC) smart window passively modulates long-wave infrared (LWIR) radiation intensity in response to ambient temperature, enabling passive cooling in summer and thermal insulation in winter. Nevertheless, significant challenges remain in simultaneously optimizing solar transmittance (<em>T</em><sub>sol</sub>), LWIR emissivity modulation (Δ<em>ɛ</em><sub>LWIR</sub>), and daylight harvesting. Herein, we constructed an adaptive bifunctional anti-reflection or high-reflection layer integrated with a Fabry-Pérot (F-P) cavity architecture comprising a top W<sub><em>x</em></sub>V<sub>1-<em>x</em></sub>O<sub>2</sub> lay, a porous SiO<sub>2</sub> spacer, and a bottom FTO layer on a glass substrate. This design enables a remarkable improvement of Δ<em>T</em><sub>sol</sub> from 1.96 % to 6.45 % between high- and low-temperature states while maintaining strong LWIR emissivity modulation (Δ<em>ɛ</em><sub>LWIR</sub> = 0.48) within the atmospheric window (8–13 μm). The rough surface morphology of W<sub><em>x</em></sub>V<sub>1-<em>x</em></sub>O<sub>2</sub> plays a critical role in enhancing both luminous transmittance (<em>T</em><sub>lum</sub>) and Δ<em>T</em><sub>sol</sub>. <em>T</em><sub>lum</sub> = 0.50 meets the minimum requirement for lighting in residential and office buildings, without generating additional lighting energy consumption during the day. Furthermore, energy consumption simulation verifies the application potential of the designed smart windows under diverse global climatic conditions. These design strategies broaden the spectral regulation range of PDRC smart windows and pave the way for their practical applications.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"58 ","pages":"Article 101866"},"PeriodicalIF":9.7,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145068038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Unlocking superior dispersion uniformity in powder-binder feedstock for near net-shaping via Hansen solubility-guided design 通过汉森溶解度导向设计解锁粉末粘合剂原料近净成型的卓越分散均匀性

IF 9.7 2区材料科学

Materials Today Physics Pub Date : 2025-09-16 DOI: 10.1016/j.mtphys.2025.101867

Mengxiong Chen, Yang Fu, Huiwen Xiong, Lei Zhang, Jianpeng Zou, Kechao Zhou

{"title":"Unlocking superior dispersion uniformity in powder-binder feedstock for near net-shaping via Hansen solubility-guided design","authors":"Mengxiong Chen, Yang Fu, Huiwen Xiong, Lei Zhang, Jianpeng Zou, Kechao Zhou","doi":"10.1016/j.mtphys.2025.101867","DOIUrl":"10.1016/j.mtphys.2025.101867","url":null,"abstract":"<div><div>Powder injection molding and extrusion-based 3D printing which using thermoplastic feedstock, are pivotal manufacturing technologies. Feedstock design critically influences product quality, yet a systematic scientific methodology remains lacking. In this study, we proposed a Hansen solubility parameter (HSP)-guided strategy leveraging polymer intermolecular interaction to design and optimize polyformaldehyde (POM)-based binder systems for cermet powder. Different functional polymers/groups were evaluated within the POM binder matrix. We demonstrated that polystyrene (PS) improved the dispersion uniformity of the binder phase and reduced the feedstock viscosity and crystallization tendency. Epoxy resin (EP) adsorbed onto the powder surface through chemical bonding, improving powder and binder dispersibility through its strong interaction with POM compatibility. The HSP-optimized feedstock demonstrated improved phase dispersion, reduced binder aggregation, and enhanced debinding and molding properties compared to conventional POM-based feedstock. This work validated the HSP-guided strategy as a viable design tool for thermoplastic feedstocks, providing a design framework applicable to both powder injection molding and extrusion-based 3D printing.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"58 ","pages":"Article 101867"},"PeriodicalIF":9.7,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145072293","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Symmetry-guided crystal structure design enhances average zT and mechanical properties in rhombohedral GeTe 对称导向晶体结构设计提高了菱形GeTe的平均zT和力学性能

IF 9.7 2区材料科学

Materials Today Physics Pub Date : 2025-09-15 DOI: 10.1016/j.mtphys.2025.101863

Wen Zhang , Hongda Song , Lifeng Jiang , Yu Yan , Xinghui Wang , Huijun Kang , Enyu Guo , Zongning Chen , Rongchun Chen , Jun Wang , Tongmin Wang

{"title":"Symmetry-guided crystal structure design enhances average zT and mechanical properties in rhombohedral GeTe","authors":"Wen Zhang , Hongda Song , Lifeng Jiang , Yu Yan , Xinghui Wang , Huijun Kang , Enyu Guo , Zongning Chen , Rongchun Chen , Jun Wang , Tongmin Wang","doi":"10.1016/j.mtphys.2025.101863","DOIUrl":"10.1016/j.mtphys.2025.101863","url":null,"abstract":"<div><div>As a distinguished thermoelectric (TE) material, GeTe has attracted considerable focus owing to its multiple valence band edges and distinctive phase transition. However, achieving the tradeoff between electrical transport and thermal transport remains a major obstacle to improving its TE performance. To overcome this limitation, we propose regulating the rhombohedral distortion of the crystal lattice. The approach maintains the high band degeneracy characteristic of high-symmetry structures and concurrently benefits from the reduced thermal conductivity of low-symmetry structures, resulting in enhanced TE performance and mechanical properties in GeTe. Specifically, the incorporation of Sb and Bi tailors crystal structure symmetry, thereby optimizing carrier concentration and driving band convergence. Additionally, grain boundaries, dislocations, planar vacancies, and nanoprecipitates enhance multi-frequency phonon scattering. Consequently, Ge<sub>0.92</sub>Sb<sub>0.02</sub>Bi<sub>0.06</sub>Te achieves a maximum <em>zT</em> of ∼1.8 at 723 K, and an excellent average <em>zT</em> (<em>zT</em><sub>ave</sub>) of ∼1.1 between 323 and 723 K, representing an impressive 124 % enhancement compared to pristine GeTe. Meanwhile, the hardness and compressive strength of Ge<sub>0.92</sub>Sb<sub>0.02</sub>Bi<sub>0.06</sub>Te are enhanced to ∼216 Kgf mm<sup>−2</sup> and ∼175 MPa, respectively. This work illuminates the pivotal role of symmetry-driven band structure and multi-scale defects in advancing TE materials.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"58 ","pages":"Article 101863"},"PeriodicalIF":9.7,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145059619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

TiN-loaded photothermal superhydrophobic coating with integrated passive anti-icing, active deicing, and anti-corrosion functions 负载锡光热超疏水涂层，具有综合被动防冰、主动除冰和防腐功能

IF 9.7 2区材料科学

Materials Today Physics Pub Date : 2025-09-13 DOI: 10.1016/j.mtphys.2025.101857

Binbin Zhang , Xiaozhuo Liu , Min Wang , Baorong Hou

{"title":"TiN-loaded photothermal superhydrophobic coating with integrated passive anti-icing, active deicing, and anti-corrosion functions","authors":"Binbin Zhang , Xiaozhuo Liu , Min Wang , Baorong Hou","doi":"10.1016/j.mtphys.2025.101857","DOIUrl":"10.1016/j.mtphys.2025.101857","url":null,"abstract":"<div><div>Corrosion and ice accretion at low temperatures significantly compromise the operational reliability of facilities and equipment. The development of protective materials that integrate both anti-corrosion and anti-icing properties is crucial for ensuring their safe and sustained service. In this paper, we constructed a novel TiN-loaded photothermal superhydrophobic coating (ZIF-8@PDA@PF-POS@EP-TiN) via a facile spray-coating method for integrated passive anti-icing, active deicing, and anti-corrosion applications. By synergistically incorporating ZIF-8@PDA@PF-POS and TiN into epoxy resin matrix, the coating achieves superhydrophobicity (with water contact angle of 153.1 ± 1.3°, and sliding angle of 1.0 ± 0.1°), exceptional mechanical durability, and efficient photothermal conversion capability under simulated solar irradiation. Electrochemical tests reveal six orders of magnitude higher charge transfer resistance (2.45 × 10<sup>10</sup> Ω cm<sup>2</sup>) than bare aluminum alloy, indicating superior anti-corrosion performance. Additionally, the coating significantly delays ice formation (15.1 × and 19.7 × longer at −10 °C and −20 °C, respectively) and enables rapid photothermal deicing (complete melting after 393 s at −10 °C and 766 s at −20 °C under 1.0 sun irradiation). This multifunctional superhydrophobic coating offers a robust and energy-efficient anti-corrosion and anti-icing solution for harsh environments such as offshore infrastructure and aerospace systems.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"58 ","pages":"Article 101857"},"PeriodicalIF":9.7,"publicationDate":"2025-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145043231","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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