Physica B-condensed Matter最新文献_第2页

Graphene nanoribbon resonant tunneling diode with dual connection between contacts 触点间双连接的石墨烯纳米带谐振隧道二极管

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2024-10-11 DOI: 10.1016/j.physb.2024.416598

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Andreev reflection for MnTe altermagnet candidate 候选锰碲变磁体的安德烈耶夫反射

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2024-10-10 DOI: 10.1016/j.physb.2024.416602

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Influence of Ni doping on microstructural, optical and dielectric properties of lanthanum-based chromite 掺杂镍对镧系铬铁矿微观结构、光学和介电性能的影响

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2024-10-10 DOI: 10.1016/j.physb.2024.416614

{"title":"Influence of Ni doping on microstructural, optical and dielectric properties of lanthanum-based chromite","authors":"","doi":"10.1016/j.physb.2024.416614","DOIUrl":"10.1016/j.physb.2024.416614","url":null,"abstract":"<div><div>In this work, LaCrO<sub>3</sub> (LCO) and LaCr<sub>0.5</sub>Ni<sub>0.5</sub>O<sub>3</sub> (LCNO) chromite samples are synthesized through sol-gel auto-combustion method. The effect of nickel content in LaCrO<sub>3</sub> is studied with respect to their structural, optical and dielectric properties. X-ray diffraction (XRD) confirmed the single-phase orthorhombic crystal structure with space group (<em>Pnma</em>) of both the samples. The obtained lattice parameters and bond lengths via Rietveld refinement analysis are found to be increased with Ni content. The crystallite sizes of LCO and LCNO are calculated using Scherrer's equation, which are found to be 22 nm and 28 nm, respectively. The Fourier-transform infrared (FTIR) spectroscopy of both the samples confirmed the different functional groups and having two main characteristic bands at 420 and 620 cm<sup>−1</sup>. Scanning electron microscopy (SEM) shows the variation in the surface morphology with Ni doping. Energy-dispersive X-ray (EDX) spectroscopy confirm the elemental compositions of the samples with their nominal atomic and weight percentages. UV–Visible spectroscopy reveals the decrease in the band gap energy from 2.60 eV to 2.30 eV with Ni doping. Raman spectra of LCO and LCNO samples, confirmed the formation of single-phase orthorhombic structure. The Raman active modes are also shifted with Ni doping due to lattice strain and crystal defects. Photoluminescence (PL) absorption intensities are varied, which is due to the creation of defects with Ni doping in LCO crystal structure. The electronic states of constituent element are obtained using X-ray photoelectron spectroscopy (XPS). Dielectric constant (εʹ), loss, and a.c. conductivity (σ<sub>ac</sub>) are studied based on the Ni<sup>2+</sup>/Ni<sup>3+</sup> substitution in LCO at Cr site.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142446533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Exploration of structural, electrical, and thermoelectric properties of two-dimensional WTe2 in three phases through ab initio investigations 通过 ab initio 研究探索三相二维 WTe2 的结构、电学和热电性能

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2024-10-09 DOI: 10.1016/j.physb.2024.416609

{"title":"Exploration of structural, electrical, and thermoelectric properties of two-dimensional WTe2 in three phases through ab initio investigations","authors":"","doi":"10.1016/j.physb.2024.416609","DOIUrl":"10.1016/j.physb.2024.416609","url":null,"abstract":"<div><div>In this study, the structural, electrical, and thermoelectric properties for three phases of two-dimensional <span><math><msub><mrow><mi>WTe</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span> have been investigated using first-principles study and semiclassic Boltzmann theory. The results of the electronic density of states have represented band gaps of 1.026, 1.021, and 1.048 eV for phase 1, phase 2, and phase 3, respectively. Furthermore, the largest value of the Seebeck coefficient at 300 K belonged to phase 2 with a value of 1585.21 <span><math><mi>μ</mi></math></span>V/K at the chemical potential of 0.45 eV. In addition, the largest value of electrical conductivity per relaxation time was related to phase 1 at 300 K with the value of 3.42 × 10<sup>20</sup> <span><math><msup><mrow><mi>Ω</mi></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></math></span> m<sup>−1</sup> s<sup>−1</sup> at the chemical potential of -1.94 eV. Moreover, the largest value of the thermoelectric power factor per relaxation time occurred for phase 1 at 700 K with a value of 48.62 × 10<sup>16</sup> <span><math><mi>μ</mi></math></span>W m<sup>−1</sup> K<sup>−2</sup> s<sup>−1</sup> at the chemical potential of -1.17 eV.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142446534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Excellent mechanical properties and giant room-temperature elastocaloric effect in spark plasma sintered Ni-Co-Mn-Ti shape memory alloy 火花等离子烧结镍-钴-锰-钛形状记忆合金的优异力学性能和巨大室温弹性效应

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2024-10-09 DOI: 10.1016/j.physb.2024.416611

{"title":"Excellent mechanical properties and giant room-temperature elastocaloric effect in spark plasma sintered Ni-Co-Mn-Ti shape memory alloy","authors":"","doi":"10.1016/j.physb.2024.416611","DOIUrl":"10.1016/j.physb.2024.416611","url":null,"abstract":"<div><div>All-d-metal Heusler-type Ni-Mn-Ti alloys have emerged as a research focus in the field of elastocaloric refrigeration due to their remarkable elastocaloric effect. However, the mechanical properties of these materials present a challenge for their engineering applications. In this work, Ni<sub>37</sub>Co<sub>13</sub>Mn<sub>33.5</sub>Ti<sub>16.5</sub> alloys with varying particle sizes were successfully prepared under different conditions using spark plasma sintering. The influence of particle size on the microstructure, mechanical properties and the elastocaloric effect were systematically explored. The results indicate that smaller particle sizes can significantly enhance mechanical properties during the SPS process, primarily due to grain refinement and the presence of Ti-rich second phases within the grains. Notably, compressive strength and fracture strain reached as high as 2225 MPa and 33 %, respectively, marking an increase of 145.9 % and 312.5 % over the as-cast alloy. Additionally, an unprecedently adiabatic temperature variation of 31.2 K was obtained upon loading in the sintered Ni-(Co)-Mn-Ti shape memory alloys.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142425055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pressure-induced amorphization in α-GeO2: Structural evolution and improved dielectric properties α-GeO2 中的压力诱导非晶化：结构演变和介电性质的改善

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2024-10-09 DOI: 10.1016/j.physb.2024.416612

引用次数: 0

Enhancement of supercapacitor efficiency by Fe3+ doping in hydrothermally synthesized NiO nanoparticles 通过在水热合成的氧化镍纳米粒子中掺入 Fe3+ 提高超级电容器的效率

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2024-10-09 DOI: 10.1016/j.physb.2024.416608

{"title":"Enhancement of supercapacitor efficiency by Fe3+ doping in hydrothermally synthesized NiO nanoparticles","authors":"","doi":"10.1016/j.physb.2024.416608","DOIUrl":"10.1016/j.physb.2024.416608","url":null,"abstract":"<div><div>This study examines the physicochemical and electrochemical characteristics of hydrothermally produced, 800°C-annealed pure and Fe<sup>3+</sup> doped (0.02, 0.04, and 0.06 M) NiO nanoparticles(NPs).The face-centred cubic structure of NiO NPs was verified by XRD analysis, and doping resulted in a decrease in crystallite size from 43.92 nm to 19.67 nm.FE-SEM revealed dense and irregularly arranged granular morphologies, while EDAX confirmed successful Fe<sup>3+</sup> incorporation into NiO matrix. UV–Vis DRS showed an increase in bandgap energy from 3.15 eV to 3.71 eV. XPS confirmed the presence of Ni<sup>2+</sup> and Fe<sup>3+</sup> with their elemental compositions. According to BET analysis, Fe<sup>3+</sup> doping increases pore size and specific surface area, which raises specific capacitance.VSM analysis of pure and Fe<sup>3+</sup> doped NiO NPs demonstrated a transition from a weak ferromagnetic to a distinctive ferromagnetic behaviour, which is beneficial for energy storage as well as data storage applications.The electrochemical studies showed that 0.06 M Fe<sup>3+</sup> doped NiO had the maximum specific capacitance of 360.96 F g<sup>−1</sup> at the scan rate of 10 mV s<sup>−1</sup>and EIS Nyquist plots showed enhanced electrical conductivity. These results highlight the possibility of Fe<sup>3+</sup> doped NiO NPs as excellent electrode materials for high-efficiency supercapacitors.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142425059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Corrigendum to ‘Slip to twinning to slip transition in polycrystalline BCC-Fe: Effect of grain size’ [Physica B 694 / PHYSB-D-24-01567R1] 多晶 BCC-Fe 中从滑移到孪晶再到滑移的转变：晶粒尺寸的影响' [Physica B 694 / PHYSB-D-24-01567R1] 更正

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2024-10-09 DOI: 10.1016/j.physb.2024.416578

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Optical and magnetic properties of Zn0.9Mn0.05Fe0.05O thin films deposited by RF-magnetron sputtering 射频磁控溅射法沉积的 Zn0.9Mn0.05Fe0.05O 薄膜的光学和磁学特性

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2024-10-08 DOI: 10.1016/j.physb.2024.416607

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Investigation of electrical, dielectric, magnetic and electrochemical characteristics of a BaFe12O19/Co0.5Zn0.5Fe2O4 nanocomposite 研究 BaFe12O19/Co0.5Zn0.5Fe2O4 纳米复合材料的电学、介电、磁学和电化学特性

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2024-10-08 DOI: 10.1016/j.physb.2024.416600

{"title":"Investigation of electrical, dielectric, magnetic and electrochemical characteristics of a BaFe12O19/Co0.5Zn0.5Fe2O4 nanocomposite","authors":"","doi":"10.1016/j.physb.2024.416600","DOIUrl":"10.1016/j.physb.2024.416600","url":null,"abstract":"<div><div>BaFe<sub>12</sub>O<sub>19</sub> (barium ferrite, i.e., BaF) nanoparticles, Co<sub>0.5</sub>Zn<sub>0.5</sub>Fe<sub>2</sub>O<sub>4</sub> (cobalt zinc ferrite, i.e, CZF) nanoparticles and their nanocomposite were synthesized for the investigation of electrical, magnetic, dielectric, and electrochemical properties. The X-ray diffraction (XRD) pattern revealed the formation of hexagonal structure for BaF nanoparticles and cubic structure for CZF nanoparticles with crystallite size of 32.44 nm and 31.30 nm, respectively. Whereas, for nanocomposite, the crystallite size obtained is 34.21 nm were shifting of peaks revealed the formation of nanocomposite. The Fourier transform Infrared (FTIR) spectra revealed the presence of metal-oxygen vibrational peaks for all the samples. The dielectric data revealed the increase in dielectric constant of nanocomposite as compared to pristine CZF whereas, loss reduced for nanocomposite significantly. Single semicircle in Nyquist plot for all the samples revealed the contribution of grain resistance in impedance. The hysteresis loop showed the increase in specific saturation magnetization from 16.963 emu/g to 21.305 emu/g for nanocomposite when compared with pristine BaF. Whereas specific remnant magnetization increased to 10.305 emu/g for nanocomposites. The electrochemical properties presented by Cyclic voltammetry showed the presence of cathodic and anodic peaks which revealed the presence of redox reaction in all samples. The specific capacitance calculated for all samples at different scan rate revealed that a nanocomposite showed highest Cs value 16.43 F/g at 25 mV, whereas it increased to 27.01 F/g, 35.93 F/g and 38.87 F/g with the increase in scan rate to 50 mV, 75 mV and 100 mV, respectively.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142419152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0