Materials Today Physics最新文献

{"title":"Synergistic enhancement of radar wave absorption in SiC/Al2O3 composites via structural tuning, composition optimization, and unit design","authors":"Xinli Ye ,&nbsp;Yuxin Zhang ,&nbsp;Jianqing Xu ,&nbsp;Shan Li ,&nbsp;Xiaomin Ma ,&nbsp;Linglin Cao ,&nbsp;Junxiong Zhang ,&nbsp;Xiaohua Zhang ,&nbsp;Kai Zheng","doi":"10.1016/j.mtphys.2025.101662","DOIUrl":"10.1016/j.mtphys.2025.101662","url":null,"abstract":"<div><div>Due to the limitations in structure and loss mechanisms, achieving both excellent reflection loss and broadband electromagnetic absorption simultaneously has been challenging for SiC-based materials. In this study, an innovative approach was adopted to fabricate Al₂O₃-modified SiC (SiC/Al₂O₃) ceramic matrix composites by polymer impregnation and pyrolysis method, and oxidation of a carbon framework. Through structural engineering, the introduction of Al₂O₃ phase established different loss mechanisms, such as dielectric loss and conductive loss. During the X-band (8.20–12.40 GHz), the resulting composite achieved a minimum reflection loss (RL_min) of −50.52 dB at a thickness of 2.20 mm, with an effective absorption bandwidth (EAB) of just 2.28 GHz. Building upon this foundation, two different periodic metamaterial structures were designed to optimize the electromagnetic absorption performance of the SiC/Al₂O₃ composite. By employing a multi-scale design strategy, significant improvements in both RL_min and EAB were achieved innovatively. The cross-shaped structure achieved efficient absorption across a frequency range of 8.20–12.40 GHz, reaching an RL_min of −78.69 dB and an EAB of 3.32 GHz at a total thickness of 2.80 mm. This research provides a novel approach for designing advanced SiC-based metamaterials with excellent radar stealth performance in the X-band.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"51 ","pages":"Article 101662"},"PeriodicalIF":10.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143026756","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}

{"title":"High precision prediction of structure and thermal properties of ternary eutectic carbonates by machine learning potential for solar energy application","authors":"Heqing Tian,&nbsp;Tianyu Liu,&nbsp;Wenguang Zhang","doi":"10.1016/j.mtphys.2025.101670","DOIUrl":"10.1016/j.mtphys.2025.101670","url":null,"abstract":"<div><div>Molten carbonates with high operating temperatures and excellent thermal properties are very promising phase change material for high temperature thermal energy storage. However, the structure and thermal properties of carbonates at high temperatures are lacking and difficult to measure accurately. Here, a deep potential model of ternary eutectic carbonates was developed by using first-principles molecular dynamics (FPMD) simulations as an initial dataset, and active learning using Deep Potential GENerator. The results indicate that the structure of carbonates becomes loose with increasing temperature, there is rotation of the CO₃^2- in motion, and there is a slight oscillation of the C-O bond. As the temperature increases from 700K to 1100K, the density linearly decreases from 2.01 g/cm³ to 1.86 g/cm³, and the viscosity exponentially decreases from 32.824 mPa⋅s to 3.806 mPa⋅s. The density, specific heat capacity, thermal conductivity and viscosity obtained from the simulation are in good agreement with the experimental values, where the minimum error in viscosity is only 2.45 %. This study opens a pathway to use machine learning potential to predict the melt structure and thermal properties of complex molten salt systems with high accuracy.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"51 ","pages":"Article 101670"},"PeriodicalIF":10.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143191772","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}

{"title":"Poly(methyl methacrylate)-assisted construction for enhanced optical absorption nonlinearities in two-dimensional Dion-Jacobson perovskite films","authors":"Zihao Guan ,&nbsp;Zhiyuan Wei ,&nbsp;Yanyan Xue ,&nbsp;Lulu Fu ,&nbsp;Yang Zhao ,&nbsp;Lu Chen ,&nbsp;Zhipeng Huang ,&nbsp;Mark G. Humphrey ,&nbsp;Jun Xu ,&nbsp;Chi Zhang","doi":"10.1016/j.mtphys.2025.101652","DOIUrl":"10.1016/j.mtphys.2025.101652","url":null,"abstract":"<div><div>Two-dimensional (2D) Ruddlesden-Popper (RP) and Dion-Jacobson (DJ) perovskites are attractive candidates for nonlinear photonic applications, owing to their unique “multiple quantum wells” structures. However, the nonlinear optical (NLO) absorption properties of DJ perovskites with higher structural stability and charge transport capability are still not well known. Additionally, the defects at grain boundaries are a key issue limiting the optoelectronic performance of perovskite films. In this work, three n = 1 phase 2D DJ perovskite films with representative organic cations were prepared, which are (BDA)PbI₄, (AMP)PbI₄, and (PDMA)PbI₄, respectively (BDA: 1,4-butadiammonium, AMP: 4-(aminomethyl)piperidine, PDMA: 1,4-phenylenedimethanammonium). The impact of the interlayer organic cation steric effect and conjugation effect on their NLO absorption properties was systematically explored. Subsequently, a novel poly(methyl methacrylate) (PMMA) passivation strategy was proposed that improved crystal quality and reduced perovskite ion defects. NLO absorption measurements demonstrate all pristine perovskite films manifest saturable absorption (SA) responses under femtosecond (fs) laser pulses at 515 nm and turn to reverse saturable absorption (RSA) behaviors at 800 nm. These can be attributed to the quantum and dielectric confinement effects of 2D perovskites, while the better interlayer charge transport of 2D DJ perovskites also contributes to the prominent nonlinear absorption performance. After PMMA passivation treatment, 2D DJ perovskite films exhibited significantly enhanced nonlinear absorption properties under wide-band ultrafast lasers excitation, which benefit from better crystal quality and reduced trap states, implying good universality of this strategy. Owing to the hydrophobicity of PMMA, its addition also induces better ambient stability in passivated films, improving the feasibility of this material in the practical development of photonic devices and thus having broad application prospects. This work offers new insights and a more systematic mechanism explanation for the NLO absorption properties of 2D DJ perovskite films, and presents a feasible passivation strategy for optimizing their NLO absorption performance.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"51 ","pages":"Article 101652"},"PeriodicalIF":10.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142981481","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}

{"title":"Intrinsically low lattice thermal conductivity and multivalley band structure induced promising high thermoelectric performance in Pb3Bi2S6","authors":"Dongyang Wang ,&nbsp;Ke Zhao ,&nbsp;Tao Hong ,&nbsp;Jiaqi Zhu ,&nbsp;Haonan Shi ,&nbsp;Bingchao Qin ,&nbsp;Yongxin Qin ,&nbsp;Guangtao Wang ,&nbsp;Xiang Gao ,&nbsp;Shaobo Cheng ,&nbsp;Chongxin Shan ,&nbsp;Li-Dong Zhao","doi":"10.1016/j.mtphys.2025.101654","DOIUrl":"10.1016/j.mtphys.2025.101654","url":null,"abstract":"<div><div>Exploring novel material with lower thermal conductivity and excellent electrical property is beneficial to the application of thermoelectrics. The recently developed Pb₃Bi₂S₆ is regarded as promising thermoelectric material since its intrinsically low thermal conductivity. However, the mechanism of phonon-glass behavior is unclear, and the intrinsic thermoelectric performance is relative lower. In this study, the mechanism of lower thermal conductivity and the thermoelectric transport properties are evaluated by first-principles calculations and Boltzmann transport theory. Our findings indicate that the hierarchical chemical bonding present in BiS₆, PbS₆, and PbS₈ polyhedral structures, arising from the dual 6<em>s</em>² lone pair electrons of Pb and Bi atoms, along with rattler-like behavior of Pb atoms, contributes to an intrinsically low lattice thermal conductivity in Pb₃Bi₂S₆. Obviously multivalley in valence band edge leads to excellent electrical properties and resulting in promising thermoelectric performance under <em>p</em>-type doping. A maximum <em>ZT</em> ∼1.25 can be obtained at 700 K with carrier concentration of ∼8.07 × 10¹⁹ cm⁻³. This work reveals the mechanism for intrinsic low lattice thermal conductivity and provides useful guidance for achieving the promising performance in Pb₃Bi₂S₆.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"51 ","pages":"Article 101654"},"PeriodicalIF":10.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142990930","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}

{"title":"Design and regulation of electromagnetic parameters of THz absorbing epoxy resin composite film for 6G electronic packaging","authors":"Yunbo Guo ,&nbsp;Zhuo Wang ,&nbsp;Siyi Bi ,&nbsp;Qi Sun ,&nbsp;Yinxiang Lu","doi":"10.1016/j.mtphys.2025.101655","DOIUrl":"10.1016/j.mtphys.2025.101655","url":null,"abstract":"<div><div>Flexible electrically insulating packaging materials with high absorption performance are urgently indispensable in the wide applications for 6G electronic devices. Herein, direct modification of KH550 and low-filler loading of mSiO₂ are proposed to construct enhanced epoxy resin (EP) composite film. The resultant EP-F sample achieves an average total shielding effectiveness (SE_T) of 15.11 dB (0.2–2.5 THz) at a thickness of 1 mm, representing a 142 % improvement over the EP sample. At a thickness of 1.8 mm, EP-F exhibits effective THz wave absorption across 0.5–2.5 THz frequency range, with an average reflection loss (RL) value of −14 dB. The dielectric behavior and THz wave absorption of the KH550- and mSiO₂-modified EP samples were analyzed through dielectric constant spectra and Cole-Cole plots for the first time, elucidating the distinction and relationship between microwave-like polarization and infrared-like absorption mechanisms in polar dielectric polymer materials within the THz range. Moreover, the EP-F sample exhibits enhanced mechanical properties and thermal stability, with a volume resistivity of 8.75 × 10¹² Ω cm and a breakdown field strength of 37.59 kV/mm. Finally, the potential application of EP-F in practical THz circuit board packaging was demonstrated through Finite difference time domain (FDTD) simulation modeling. The enhanced epoxy resin material demonstrates enormous promise for in-situ shielding and packaging of THz devices, fabrication of efficient wave-absorbing layers, and various future applications.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"51 ","pages":"Article 101655"},"PeriodicalIF":10.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143026757","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}

{"title":"Synchronous realization of remarkable energy-storage density and efficiency in (Na0.5Bi0.5)0.75Sr0.25TiO3-based lead-free ceramics at moderate electric fields","authors":"Yongping Pu ,&nbsp;Chunhui Wu ,&nbsp;Fangli Yu ,&nbsp;Xiang Lu ,&nbsp;Yating Ning ,&nbsp;Lei Zhang ,&nbsp;Zenghui Liu","doi":"10.1016/j.mtphys.2025.101657","DOIUrl":"10.1016/j.mtphys.2025.101657","url":null,"abstract":"<div><div>Lead-free dielectric ceramics, as vital components of eco-friendly advanced pulse power systems, have encountered challenges for simultaneously achieving excellent energy-storage density (<em>W</em>_rec) and efficiency (<em>η</em>) at moderate electric fields. To address this issue, a novel class of (1-<em>x</em>)(Na_0.5Bi_0.5)_0.75Sr_0.25TiO₃-<em>x</em>(K_0.5Ag_0.5)_0.97Bi_0.01NbO₃ (NBST-<em>x</em>KABN, <em>x</em> = 0, 0.05, 0.10 and 0.15) relaxor ferroelectric ceramics are designed and synthesized in this work. K⁺-Bi³⁺ ion pairs are introduced into NBST-<em>x</em>KABN ceramics to alter charge distribution and destroy local structural symmetry of A-site. Thereby, large saturation polarization is maintained, which assists in energy storage at lower electric fields and minimizing the likelihood of aging failure in energy-storage devices that operate at high electric fields. Moreover, the incorporation of KABN strengthens breakdown strength of ceramics via reducing grain size and improving density and electrical uniformity (simulated by COMSOL). Along with the enhanced relaxor behavior induced by compositional inhomogeneity and ionic disorder, NBST-0.10KABN ceramics synchronously obtain <em>W</em>_rec of 5.3 J/cm³ and high <em>η</em> of 90.0 % at a moderate electric field of 330 kV/cm. The optimum composition also exhibits satisfactory temperature (30–130 °C) and frequency (1–100 Hz) stability, accompanied by large power density (<em>P</em>_D) of 38.2 MW/cm³ and rapid discharge rate <em>t</em>_0.9 of 34.8 ns. This work offers an achievable tactic to develop dielectric ceramics with remarkable comprehensive energy-storage properties at moderate electric fields, so as to satisfy requirements of energy-storage capacitors in harsh circumstances.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"51 ","pages":"Article 101657"},"PeriodicalIF":10.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143020887","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}

{"title":"Metal ion mediated conductive hydrogels with low hysteresis and high resilience","authors":"Zhiwei Chen ,&nbsp;Xionggang Chen ,&nbsp;Haidong Wang ,&nbsp;Tingting Yang ,&nbsp;Jinxia Huang ,&nbsp;Zhiguang Guo","doi":"10.1016/j.mtphys.2025.101656","DOIUrl":"10.1016/j.mtphys.2025.101656","url":null,"abstract":"<div><div>Conductive hydrogels with poor mechanical properties seriously limit the service life of sensors and flexible electronics. Outstanding mechanical properties and electrical conductivity are the bottleneck of the application of conductive hydrogels. To combined excellent elasticity and electronic conductivity, herein, a new method was employed to achieve elastic dissipation with low hysteresis via introduce metal ions crosslinking, thereby enhancing mechanical dissipation of polymer network. Specifically, acrylamide (AAm) is a monomer in the covalent network via free radical polymerization. Sodium alginate (SA) form metal coordination bonds with Fe³⁺, Zn²⁺ and Ca²⁺. Poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT: PSS) is selected to be a conductive polymer. The resultant AAm/SA/PEDOT: PSS (ASP) hydrogels exhibit low hysteresis, high resilience and excellent electronic conductivity. Metal coordination bonds not only provide high elasticity as elastic dissipation energy, but also enhance electrical conductivity. The ASP hydrogels display combined mechanical performances with elastic modulus (550 MPa), fracture strength (0.81 MPa), fracture strain (473 %) and work of rupture (3.13 MJ/m³), and outstanding electronic conductivity (0.32 S/cm) which has great potential for extending the service life of hydrogels.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"51 ","pages":"Article 101656"},"PeriodicalIF":10.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143021094","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}

{"title":"Tunable high spin Chern-number insulator phases in strained Sb monolayer","authors":"Jacob Cook ,&nbsp;Po-Yuan Yang ,&nbsp;Theo Volz ,&nbsp;Clayton Conner ,&nbsp;Riley Satterfield ,&nbsp;Joseph Berglund ,&nbsp;Qiangsheng Lu ,&nbsp;Rob G. Moore ,&nbsp;Yueh-Ting Yao ,&nbsp;Tay-Rong Chang ,&nbsp;Guang Bian","doi":"10.1016/j.mtphys.2025.101664","DOIUrl":"10.1016/j.mtphys.2025.101664","url":null,"abstract":"<div><div>High spin Chern-number insulators (HSCI) have emerged as a novel 2D topological phase of condensed matter that is beyond the classification of topological quantum chemistry. The HSCI phase with two pairs of gapless helical edge states is robust even in the presence of spin–orbit coupling due to the protection of a “hidden” feature spectrum topology. In this work, we report the observation of a semimetallic Sb monolayer carrying the same band topology as HSCI with the spin Chern number equal to 2. Our calculations further indicate a moderate lattice strain can make Sb monolayer an insulator or a semimetal with a tunable spin Chern number from 0 to 3. The results suggest strained Sb monolayers as a promising platform for exploring exotic properties of the HSCI topological matter.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"51 ","pages":"Article 101664"},"PeriodicalIF":10.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143083834","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}

{"title":"In-situ loaded PPy hydrogel for efficient atmospheric water harvesting without any energy consumption","authors":"Danyan Zhan ,&nbsp;Changhui Fu ,&nbsp;Zhengting Yu ,&nbsp;Guangyi Tian ,&nbsp;Yuxuan He ,&nbsp;Xionggang Chen ,&nbsp;Zhiguang Guo","doi":"10.1016/j.mtphys.2025.101658","DOIUrl":"10.1016/j.mtphys.2025.101658","url":null,"abstract":"<div><div>Hygroscopic salt-hydrogel-based atmospheric water harvesting (HAWH) technology represents an auspicious approach to alleviating the water crisis, as it is not limited by factors such as climactic. Reducing hygroscopic salt leakage is of the utmost importance to maintaining the technology's consistent performance. Consequently, we have developed a composite hygroscopic material (PPy-AAC-LiCl) with in situ loaded polypyrrole (PPy) as a photothermite. The in-situ loading of PPy not only achieves the photothermal performance of PPy-AAC-LiCl but also enhances the hygroscopic performance, which is due to the presence of nitrogen atoms in the structure facilitating the formation of hydrogen bonds between water molecules, and reduces the leakage of hygroscopic salts attributed to its ability to inhibit the increase in pore size after hygroscopicity of PPy-AAC-LiCl. The experimental results show that PPy-AAC-LiCl has effective hygroscopic performance at relative humidity (RH) of 30 %–90 %. The hygroscopicity at 25 °C and RH 70 % was about 1.53 g_water g_adsorbents⁻¹ after 12 h. After ten hygroscopicity-desorption cycles, the hygroscopicity of the samples did not decrease significantly, and no white crystals appeared on the surface of the samples during the desorption process. Furthermore, PPy-AAC-LiCl demonstrated effective atmospheric water harvesting capabilities in outdoor trials, exhibiting a desorption rate of 87.6 % and a moisture absorption rate of 1.26 g_water g_adsorbents⁻¹. The preparation of this simple and environmentally friendly hygroscopic composite material lays the foundation for the future development of atmospheric water materials.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"51 ","pages":"Article 101658"},"PeriodicalIF":10.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143020891","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}

{"title":"Screening of promising thermoelectric materials from MnTe-GeTe alloying","authors":"Tiantian Wang ,&nbsp;Quansheng Guo ,&nbsp;Jianghe Feng ,&nbsp;Juan Li ,&nbsp;Ruiheng Liu","doi":"10.1016/j.mtphys.2025.101661","DOIUrl":"10.1016/j.mtphys.2025.101661","url":null,"abstract":"<div><div>GeTe-MnTe-based materials have been proposed as promising thermoelectric materials due to the ineluctable phase transition of GeTe materials. However, the previously reported Ge_1-<em>x</em>Mn_<em>x</em>Te alloys with low MnTe content may mix with the rhombohedral phase of GeTe, making the sample unstable during thermal cycling. Moreover, the exact phase of GeTe-MnTe-based alloys have not been thoroughly studied. In this work, a series of Ge_1-<em>x</em>Mn_<em>x</em>Te (0 ≤ <em>x</em> ≤ 1) compounds were synthesized, and the changes in crystal structure and thermoelectric properties were investigated across the composition range from GeTe to MnTe. At the phase boundary, both rhombohedral and cubic phases GeTe coexist in the range of <em>x</em> = 0.15 to 0.3, while cubic phase GeTe and hexagonal MnTe phases coexist for <em>x</em> = 0.5 to 0.7. The single cubic phase is observed only near <em>x</em> = 0.4. Alloying with MnTe significantly increase the effective mass of the electronic band, which negatively impacts the electrical performance, suggesting that the thermoelectric properties are compromised in favor of enhancing the stability of the GeTe structure. Although the resistivity of the alloy increases with Mn content, the Seebeck coefficient rises significantly, and thermal conductivity decreases. These changes are likely due to enhanced phonon scattering caused by the two phases and the Mn solute atoms. As a result, relatively high figure-of-merit (<em>zT</em>) values are achieved in the rhombohedral-to-cubic phase transition region (<em>x</em> = 0.15, 0.2, 0.3) for Ge_1-<em>x</em>Mn_<em>x</em>Te.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"51 ","pages":"Article 101661"},"PeriodicalIF":10.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143030805","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}