Solid State Communications最新文献

英文中文

Ultra-wideband and multi-frequency switchable terahertz absorber based on vanadium dioxide

IF 2.1 4区物理与天体物理 Q3 PHYSICS, CONDENSED MATTER

Solid State Communications

Pub Date : 2025-02-21 DOI: 10.1016/j.ssc.2025.115884

Nan Liu , Zhen Cui , Shuang Zhang , Lu Wang

In this paper, we present the design of a switchable terahertz absorber utilizing vanadium dioxide. The switching from ultra-wideband absorption to multi-frequency absorption is achieved by adjusting the conductivity of vanadium dioxide via temperature control. Specifically, when the conductivity of vanadium dioxide reaches 2 × 10⁵ S/m, the absorber demonstrates an absorption bandwidth of 5.4 THz, attaining an absorption rate of 90 % within the frequency range of 3.9–9.3 THz. Conversely, at a conductivity level of 20 S/m, the absorber exhibits multi-frequency absorption characteristics, revealing four distinct absorption peaks, all surpassing 90 % absorption rate, located at frequencies of 3.94 THz, 7.06 THz, 7.7 THz, and 9.16 THz, respectively. To elucidate the underlying physical mechanisms governing these two distinct absorption modes, we utilize the impedance matching theory and conduct an analysis of the distribution of electric field energy. Furthermore, the absorber exhibits polarization insensitivity and maintains effective performance across a broad spectrum of incident angles, ranging from 0 to 80°. The designed absorber holds significant potential for application in terahertz imaging, sensor technology, communications, and the optoelectronic industry.

{"title":"Ultra-wideband and multi-frequency switchable terahertz absorber based on vanadium dioxide","authors":"Nan Liu , Zhen Cui , Shuang Zhang , Lu Wang","doi":"10.1016/j.ssc.2025.115884","DOIUrl":"10.1016/j.ssc.2025.115884","url":null,"abstract":"<div><div>In this paper, we present the design of a switchable terahertz absorber utilizing vanadium dioxide. The switching from ultra-wideband absorption to multi-frequency absorption is achieved by adjusting the conductivity of vanadium dioxide via temperature control. Specifically, when the conductivity of vanadium dioxide reaches 2 × 105 S/m, the absorber demonstrates an absorption bandwidth of 5.4 THz, attaining an absorption rate of 90 % within the frequency range of 3.9–9.3 THz. Conversely, at a conductivity level of 20 S/m, the absorber exhibits multi-frequency absorption characteristics, revealing four distinct absorption peaks, all surpassing 90 % absorption rate, located at frequencies of 3.94 THz, 7.06 THz, 7.7 THz, and 9.16 THz, respectively. To elucidate the underlying physical mechanisms governing these two distinct absorption modes, we utilize the impedance matching theory and conduct an analysis of the distribution of electric field energy. Furthermore, the absorber exhibits polarization insensitivity and maintains effective performance across a broad spectrum of incident angles, ranging from 0 to 80°. The designed absorber holds significant potential for application in terahertz imaging, sensor technology, communications, and the optoelectronic industry.</div></div>","PeriodicalId":430,"journal":{"name":"Solid State Communications","volume":"399 ","pages":"Article 115884"},"PeriodicalIF":2.1,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143471720","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

First-principles study of KVTe half-Heusler alloy for spintronic and thermoelectric applications

IF 2.1 4区物理与天体物理 Q3 PHYSICS, CONDENSED MATTER

Solid State Communications

Pub Date : 2025-02-21 DOI: 10.1016/j.ssc.2025.115878

B. Syad , A. Samih , A. Ben Zoubir , M. Es-Semyhy , R. El Fdil , E. Salmani , Z. Fadil , Fohad Mabood Husain , Chaitany Jayprakash Raorane

The present study undertook an examination of the diverse characteristics of the Half-Heusler KVTe alloy, encompassing its electronic, elastic, thermoelectric, mechanical, magnetic, and structural characteristics. In this investigation, the Density Functional Theory (DFT) was utilized, employing the GGA-PBE approximation. The findings of the analysis indicated that KVTe exhibited the greatest stability in the ferromagnetic (FM) configuration. An analysis of the density of states indicates that KVTe exhibits half-metallic behavior, suggesting its potential utility in spintronic applications. Moreover, a detailed examination of the elastic characteristics and mechanical response of the alloy indicates that KVTe exhibits robust mechanical stability. Finally, the results indicated that this material could be utilized in heat dissipation devices due to its promising thermoelectric properties with low Seebeck coefficient and high thermal conductivity.

本研究考察了半休斯勒 KVTe 合金的各种特性，包括其电子、弹性、热电、机械、磁性和结构特性。在这项研究中，使用了密度泛函理论（DFT），并采用了 GGA-PBE 近似方法。分析结果表明，KVTe 在铁磁（FM）构型中表现出最大的稳定性。对状态密度的分析表明，KVTe 具有半金属特性，这表明它在自旋电子应用中具有潜在的实用性。此外，对合金弹性特性和机械响应的详细研究表明，KVTe 具有强大的机械稳定性。最后，研究结果表明，这种材料具有低塞贝克系数和高热导率等良好的热电特性，可用于散热装置。

引用次数: 0

The elastic properties and strain effects on crystal structures and bandgap of MZnOS (M = Ca, Sr): A first-principles study

IF 2.1 4区物理与天体物理 Q3 PHYSICS, CONDENSED MATTER

Solid State Communications

Pub Date : 2025-02-20 DOI: 10.1016/j.ssc.2025.115881

Yuan-Lei Zheng , Wei Liu , Martin Koeckerling , Guang-Hui Rao , Jing-Tai Zhao

Mechanoluminescence (ML) materials, such as CaZnOS and SrZnOS, show great potential in lighting, sensors, and wearable devices. Despite advances in the understanding of these materials, a detailed first-principles study of the strain-stress relationship and the effects on crystal structure and bandgap is lacking. In this work, we use first-principles calculations to investigate the elastic properties, crystal structure deformations, and bandgap responses under strain for both MZnOS (M = Ca, Sr) compounds, filling the gap in the current understanding of these materials. The elastic constants, elastic modulus and Poisson's ratios for SrZnOS and CaZnOS are calculated, revealing the influence of hydrostatic pressure on lattice parameters and atomic distances. Notably, the stress-strain relationships of SrZnOS and CaZnOS reveal distinct mechanical behaviors under tensile and compressive strains along the [100] and [001] directions. Under compressive stress, especially along the [100] direction, CaZnOS shows greater compressive resistance than SrZnOS. Additionally, strain-induced bandgap variations are observed: SrZnOS exhibits a decrease in bandgap with increasing strain, while CaZnOS shows an initial bandgap widening under compressive loading (0–2.34 GPa) along the [001] direction. Our findings provide new insights into the mechanical and electronic behavior of MZnOS materials, which are crucial for their application in mechanoluminescence and other related fields.

{"title":"The elastic properties and strain effects on crystal structures and bandgap of MZnOS (M = Ca, Sr): A first-principles study","authors":"Yuan-Lei Zheng , Wei Liu , Martin Koeckerling , Guang-Hui Rao , Jing-Tai Zhao","doi":"10.1016/j.ssc.2025.115881","DOIUrl":"10.1016/j.ssc.2025.115881","url":null,"abstract":"<div><div>Mechanoluminescence (ML) materials, such as CaZnOS and SrZnOS, show great potential in lighting, sensors, and wearable devices. Despite advances in the understanding of these materials, a detailed first-principles study of the strain-stress relationship and the effects on crystal structure and bandgap is lacking. In this work, we use first-principles calculations to investigate the elastic properties, crystal structure deformations, and bandgap responses under strain for both MZnOS (M = Ca, Sr) compounds, filling the gap in the current understanding of these materials. The elastic constants, elastic modulus and Poisson's ratios for SrZnOS and CaZnOS are calculated, revealing the influence of hydrostatic pressure on lattice parameters and atomic distances. Notably, the stress-strain relationships of SrZnOS and CaZnOS reveal distinct mechanical behaviors under tensile and compressive strains along the [100] and [001] directions. Under compressive stress, especially along the [100] direction, CaZnOS shows greater compressive resistance than SrZnOS. Additionally, strain-induced bandgap variations are observed: SrZnOS exhibits a decrease in bandgap with increasing strain, while CaZnOS shows an initial bandgap widening under compressive loading (0–2.34 GPa) along the [001] direction. Our findings provide new insights into the mechanical and electronic behavior of MZnOS materials, which are crucial for their application in mechanoluminescence and other related fields.</div></div>","PeriodicalId":430,"journal":{"name":"Solid State Communications","volume":"399 ","pages":"Article 115881"},"PeriodicalIF":2.1,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143453467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Enhanced the efficiency and current density by structural modifications and conduction band shifting in lead-based mixed halide perovskite solar cells

IF 2.1 4区物理与天体物理 Q3 PHYSICS, CONDENSED MATTER

Solid State Communications

Pub Date : 2025-02-20 DOI: 10.1016/j.ssc.2025.115885

M.S. Hasan , Ola A. Abu Ali , Dalia I. Saleh , M. Awais , Munawar Iqbal , Muzammal Aslam , Muhammad Imran Irfan

The pure and Mn-doped CsPbIBr₂ perovskite films are synthesized by sol-gel spin coating. X-ray diffraction (XRD) of pure and Mn-doped films shows the pure cubic perovskite phase in both samples, with Mn-doped samples having higher crystallinity and bigger crystal sizes (21.7–35.9 nm). Mn-doping induces lattice modifications, influencing the material's structural homogeneity and optoelectronic properties. UV–Vis spectroscopy elucidates the energy band gaps, showcasing a reduced bandgap (2.141–2.079 eV) in Mn-doped CsPbIBr₂. The J-V measurement of the device with configuration FTOTiO₂Mn-CsPbIBr₂HTLAu shows an efficiency of 10.42 %. To further improve the device performance, we use Mn-WO₃ ETL with TiO₂. XRD and Raman spectroscopic characterization declared a significant crystallinity of the 4 % Mn-WO₃ electron transport layer in monoclinic phase. The UV–vis spectroscopy analysis of Mn-WO3 fabricated which has wider bandgap promote charge carrier mobility and stability, whereas, low refractive index and dielectric constants decrease light reflection and absorption losses, thus solar cells efficiency improved. The current-density voltage (J-V) measurement of the final device with configuration FTOTiO₂Mn-WO₃Mn-CsPbIBr₂HTLAu shows the efficiency of 12.75 % owing to better charge carrier extraction and decreased recombination losses. This in-depth review elucidates the origins of losses in perovskite solar cells and highlights the scope of improving efficiency by engineering materials and devices.

{"title":"Enhanced the efficiency and current density by structural modifications and conduction band shifting in lead-based mixed halide perovskite solar cells","authors":"M.S. Hasan , Ola A. Abu Ali , Dalia I. Saleh , M. Awais , Munawar Iqbal , Muzammal Aslam , Muhammad Imran Irfan","doi":"10.1016/j.ssc.2025.115885","DOIUrl":"10.1016/j.ssc.2025.115885","url":null,"abstract":"<div><div>The pure and Mn-doped CsPbIBr2 perovskite films are synthesized by sol-gel spin coating. X-ray diffraction (XRD) of pure and Mn-doped films shows the pure cubic perovskite phase in both samples, with Mn-doped samples having higher crystallinity and bigger crystal sizes (21.7–35.9 nm). Mn-doping induces lattice modifications, influencing the material's structural homogeneity and optoelectronic properties. UV–Vis spectroscopy elucidates the energy band gaps, showcasing a reduced bandgap (2.141–2.079 eV) in Mn-doped CsPbIBr2. The J-V measurement of the device with configuration FTOTiO2Mn-CsPbIBr2HTLAu shows an efficiency of 10.42 %. To further improve the device performance, we use Mn-WO3 ETL with TiO2. XRD and Raman spectroscopic characterization declared a significant crystallinity of the 4 % Mn-WO3 electron transport layer in monoclinic phase. The UV–vis spectroscopy analysis of Mn-WO3 fabricated which has wider bandgap promote charge carrier mobility and stability, whereas, low refractive index and dielectric constants decrease light reflection and absorption losses, thus solar cells efficiency improved. The current-density voltage (J-V) measurement of the final device with configuration FTOTiO2Mn-WO3Mn-CsPbIBr2HTLAu shows the efficiency of 12.75 % owing to better charge carrier extraction and decreased recombination losses. This in-depth review elucidates the origins of losses in perovskite solar cells and highlights the scope of improving efficiency by engineering materials and devices.</div></div>","PeriodicalId":430,"journal":{"name":"Solid State Communications","volume":"399 ","pages":"Article 115885"},"PeriodicalIF":2.1,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143509148","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Enhanced energy storage in supercapacitors: A study of chemically synthesized ferrite nanoparticles with optimized electrochemical properties

IF 2.1 4区物理与天体物理 Q3 PHYSICS, CONDENSED MATTER

Solid State Communications

Pub Date : 2025-02-19 DOI: 10.1016/j.ssc.2025.115880

Kashmiri A. Khamkar , Umesh V. Shembade , Sabah Ansar , Kulurumotlakatla Dasha Kumar , Sandeep B. Wategaonkar

Herein, the impact of pH on ferrite nanoparticles (NPs) was synthesized using a simple chemical co-precipitation process and utilized for supercapacitor (SCs) applications. The X-ray analysis supports the stable phase formation and cubic crystal structures of Fe₃O₄-NPs. The scanning electron microscope (SEM) revealed irregular and non-uniformly shaped (NPs) signifying the important role in electrochemistry. Further, Fourier transform infrared and Raman spectroscopy confirm the presence of various functional groups and the stretching-bending vibrations between Fe–O, and O–O bonds, respectively. In addition to this, the X-ray photoelectron spectroscopy (XPS) reveals the presence of various oxidation states of the Fe in the prepared Fe₃O₄ NPs. Additionally, the specific surface area (SSA) and pore size of prepared Fe₃O₄ (pH-12) were determined using N₂ adsorption/desorption and it shows the SSA of 33.45 m²/g, and the average pore radius of 11.23 nm, respectively. Additionally, the electrochemical measurements of the prepared electrodes were examined using an electrode cell system in 1 M KOH electrolyte. Among all samples, the Fe₃O₄ (pH-12) shows better electrochemical properties such as a high specific capacitance and capacity values of 520 F/g (57 mAh/g) at 5 mA/cm². Further, the Fe₃O₄ (pH-12) sample exhibits better capacitance retention of 84 % over 4000 CV cycles. In addition to this, the fabricated device shows better electrochemical properties in terms of energy and power densities of 12 Wh/kg and 700 W/kg at 3 mA/cm² with 88 % retention over 3000 cycles. Therefore, this study explores the better electrochemical analysis for Fe₃O₄ NPs in SCs applications.

{"title":"Enhanced energy storage in supercapacitors: A study of chemically synthesized ferrite nanoparticles with optimized electrochemical properties","authors":"Kashmiri A. Khamkar , Umesh V. Shembade , Sabah Ansar , Kulurumotlakatla Dasha Kumar , Sandeep B. Wategaonkar","doi":"10.1016/j.ssc.2025.115880","DOIUrl":"10.1016/j.ssc.2025.115880","url":null,"abstract":"<div><div>Herein, the impact of pH on ferrite nanoparticles (NPs) was synthesized using a simple chemical co-precipitation process and utilized for supercapacitor (SCs) applications. The X-ray analysis supports the stable phase formation and cubic crystal structures of Fe3O4-NPs. The scanning electron microscope (SEM) revealed irregular and non-uniformly shaped (NPs) signifying the important role in electrochemistry. Further, Fourier transform infrared and Raman spectroscopy confirm the presence of various functional groups and the stretching-bending vibrations between Fe–O, and O–O bonds, respectively. In addition to this, the X-ray photoelectron spectroscopy (XPS) reveals the presence of various oxidation states of the Fe in the prepared Fe3O4 NPs. Additionally, the specific surface area (SSA) and pore size of prepared Fe3O4 (pH-12) were determined using N2 adsorption/desorption and it shows the SSA of 33.45 m2/g, and the average pore radius of 11.23 nm, respectively. Additionally, the electrochemical measurements of the prepared electrodes were examined using an electrode cell system in 1 M KOH electrolyte. Among all samples, the Fe3O4 (pH-12) shows better electrochemical properties such as a high specific capacitance and capacity values of 520 F/g (57 mAh/g) at 5 mA/cm2. Further, the Fe3O4 (pH-12) sample exhibits better capacitance retention of 84 % over 4000 CV cycles. In addition to this, the fabricated device shows better electrochemical properties in terms of energy and power densities of 12 Wh/kg and 700 W/kg at 3 mA/cm2 with 88 % retention over 3000 cycles. Therefore, this study explores the better electrochemical analysis for Fe3O4 NPs in SCs applications.</div></div>","PeriodicalId":430,"journal":{"name":"Solid State Communications","volume":"399 ","pages":"Article 115880"},"PeriodicalIF":2.1,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143480625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Solvothermal synthesis, structure and characterizations of multinary metals selenidoarsenate

IF 2.1 4区物理与天体物理 Q3 PHYSICS, CONDENSED MATTER

Solid State Communications

Pub Date : 2025-02-19 DOI: 10.1016/j.ssc.2025.115879

Li Wang, Menghe Baiyin

In recent years, more and more researchers have begun to explore in depth due to the potential application of chalcogenidometallates in the field of photocatalysis. In this study, a multinary metals selenidoarsenate [Ni(1,2-dap)₃][HgAs₂Se₄] (1,2-dap = 1,2-diaminopropane) (1) was synthesized by solvothermal method. It was a one-dimensional (1-D) chain structure and consisted of transition metal complex [Ni(1,2-dap)₃]²⁺ and [HgAs₂Se₄]^2- anionic chain, in which the [HgAs₂Se₄]^2- anionic chain were composed of [HgSe₄] tetrahedra and As₂⁴⁺ dimers by As-Se bond. We studied the photoelectric performance of compound 1 and suggested that 1 had a fast response and good reproducibility. The UV–visible diffuse reflection spectra was tested and the band gap of 1 was 2.24 eV, which indicated that this compound has potential semiconductor properties. It is worth that we investigated the photodegradation efficiency of 1 and it value reached 71.4 % when degrading crystal violet (CV) after irradiation, which suggested that 1 had excellent photocatalytic performance. In addition, other properties have been investigated.

{"title":"Solvothermal synthesis, structure and characterizations of multinary metals selenidoarsenate","authors":"Li Wang, Menghe Baiyin","doi":"10.1016/j.ssc.2025.115879","DOIUrl":"10.1016/j.ssc.2025.115879","url":null,"abstract":"<div><div>In recent years, more and more researchers have begun to explore in depth due to the potential application of chalcogenidometallates in the field of photocatalysis. In this study, a multinary metals selenidoarsenate [Ni(1,2-dap)3][HgAs2Se4] (1,2-dap = 1,2-diaminopropane) (1) was synthesized by solvothermal method. It was a one-dimensional (1-D) chain structure and consisted of transition metal complex [Ni(1,2-dap)3]2+ and [HgAs2Se4]2- anionic chain, in which the [HgAs2Se4]2- anionic chain were composed of [HgSe4] tetrahedra and As24+ dimers by As-Se bond. We studied the photoelectric performance of compound 1 and suggested that 1 had a fast response and good reproducibility. The UV–visible diffuse reflection spectra was tested and the band gap of 1 was 2.24 eV, which indicated that this compound has potential semiconductor properties. It is worth that we investigated the photodegradation efficiency of 1 and it value reached 71.4 % when degrading crystal violet (CV) after irradiation, which suggested that 1 had excellent photocatalytic performance. In addition, other properties have been investigated.</div></div>","PeriodicalId":430,"journal":{"name":"Solid State Communications","volume":"399 ","pages":"Article 115879"},"PeriodicalIF":2.1,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143465390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Investigations of structural and thermoelectric properties of Cu2Se and Cu2-xAgxSe alloys

IF 2.1 4区物理与天体物理 Q3 PHYSICS, CONDENSED MATTER

Solid State Communications

Pub Date : 2025-02-18 DOI: 10.1016/j.ssc.2025.115877

A.M. Adam , A.K. Diab , Zainab M.H. El-Qahtani , P. Petkov , M. Ataalla

An easy and promising avenue to recover waste heat is about to be opened by thermoelectric power materials. Cu₂Se and based thermoelectric materials were synthesized and investigated in this piece of work. The thermoelectric properties of Cu₂Se were successfully tailored with an additive of Ag-traces. Cu_2-xAg_xSe alloys (x = 0.01, 0.03, 0.05) were synthesized via simple melting at 1200 K. It was found that the addition of Ag-doping resulted in significant decrease of the electrical conductivity along with an increase of the Seebeck coefficient due to the presence of point-defects and the phonon scattering. The thermoelectric power factor was calculated and found at interesting values at high temperatures. The highest power factor was recorded at 60 μW/m.K², observed for the measuring temperature of 473 K. Electronic thermal conductivity was significantly reduced because of the scattering due to Ag-doping and presence of defects. Also, existence of secondary phase helped to reduce the lattice and the total thermal conductivity. Finally, increased ZT was achieved for the Ag-doped alloys. The findings of this work showed that the maximum ZT value is achieved for Cu_1.95Ag_0.05Se material at 0.03, obtained at 473 K.

{"title":"Investigations of structural and thermoelectric properties of Cu2Se and Cu2-xAgxSe alloys","authors":"A.M. Adam , A.K. Diab , Zainab M.H. El-Qahtani , P. Petkov , M. Ataalla","doi":"10.1016/j.ssc.2025.115877","DOIUrl":"10.1016/j.ssc.2025.115877","url":null,"abstract":"<div><div>An easy and promising avenue to recover waste heat is about to be opened by thermoelectric power materials. Cu2Se and based thermoelectric materials were synthesized and investigated in this piece of work. The thermoelectric properties of Cu2Se were successfully tailored with an additive of Ag-traces. Cu2-xAgxSe alloys (x = 0.01, 0.03, 0.05) were synthesized via simple melting at 1200 K. It was found that the addition of Ag-doping resulted in significant decrease of the electrical conductivity along with an increase of the Seebeck coefficient due to the presence of point-defects and the phonon scattering. The thermoelectric power factor was calculated and found at interesting values at high temperatures. The highest power factor was recorded at 60 μW/m.K2, observed for the measuring temperature of 473 K. Electronic thermal conductivity was significantly reduced because of the scattering due to Ag-doping and presence of defects. Also, existence of secondary phase helped to reduce the lattice and the total thermal conductivity. Finally, increased ZT was achieved for the Ag-doped alloys. The findings of this work showed that the maximum ZT value is achieved for Cu1.95Ag0.05Se material at 0.03, obtained at 473 K.</div></div>","PeriodicalId":430,"journal":{"name":"Solid State Communications","volume":"399 ","pages":"Article 115877"},"PeriodicalIF":2.1,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143453554","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Structural, magnetic and cryogenic magnetocaloric properties in Gd2CrFeO6 ceramic oxide

IF 2.1 4区物理与天体物理 Q3 PHYSICS, CONDENSED MATTER

Solid State Communications

Pub Date : 2025-02-17 DOI: 10.1016/j.ssc.2025.115876

Weixiang Hao , Ran Ji , Liyao Zhu , Silu Huang , Yikun Zhang

The magnetocaloric effect (MCE) in various rare earths (RE)-containing ceramic oxides were intensively investigated currently, attempted to acquire suitable magnetic solids for cryogenic magnetic cooling application and in-depth understand their inherent magneto-physical characters. We herein determined the structural, magnetic, and cryogenic magnetocaloric properties of Gd₂CrFeO₆ ceramic oxides. Our investigations indicate that the Gd₂CrFeO₆ ceramic oxide is crystallized with an orthorhombic double-perovskite type (B-site dis-ordered) structure and possesses an antiferromagnetic transition around ∼2.7 K. The constituent elementals in present Gd₂CrFeO₆ are uniformly distributed from micrometer to nanometer scales and mainly presented with the valence states of Gd³⁺, Fe³⁺, Cr³⁺, and O²⁻, respectively. Notable cryogenic MCE in present Gd₂CrFeO₆ has been realized. The maximum magnetic entropy changes and refrigerant capacity of Gd₂CrFeO₆ ceramic oxide with magnetic field variations of 0–2/0–5 T reach 10.33/34.34 J/kgK and 55.85/239.96 J/kg, respectively. These values are at comparable to most acquired rare earth-containing materials with remarkable cryogenic MCEs, making present Gd₂CrFeO₆ ceramic oxide attractive for practical cooling applications.

{"title":"Structural, magnetic and cryogenic magnetocaloric properties in Gd2CrFeO6 ceramic oxide","authors":"Weixiang Hao , Ran Ji , Liyao Zhu , Silu Huang , Yikun Zhang","doi":"10.1016/j.ssc.2025.115876","DOIUrl":"10.1016/j.ssc.2025.115876","url":null,"abstract":"<div><div>The magnetocaloric effect (MCE) in various rare earths (RE)-containing ceramic oxides were intensively investigated currently, attempted to acquire suitable magnetic solids for cryogenic magnetic cooling application and in-depth understand their inherent magneto-physical characters. We herein determined the structural, magnetic, and cryogenic magnetocaloric properties of Gd2CrFeO6 ceramic oxides. Our investigations indicate that the Gd2CrFeO6 ceramic oxide is crystallized with an orthorhombic double-perovskite type (B-site dis-ordered) structure and possesses an antiferromagnetic transition around ∼2.7 K. The constituent elementals in present Gd2CrFeO6 are uniformly distributed from micrometer to nanometer scales and mainly presented with the valence states of Gd3+, Fe3+, Cr3+, and O2−, respectively. Notable cryogenic MCE in present Gd2CrFeO6 has been realized. The maximum magnetic entropy changes and refrigerant capacity of Gd2CrFeO6 ceramic oxide with magnetic field variations of 0–2/0–5 T reach 10.33/34.34 J/kgK and 55.85/239.96 J/kg, respectively. These values are at comparable to most acquired rare earth-containing materials with remarkable cryogenic MCEs, making present Gd2CrFeO6 ceramic oxide attractive for practical cooling applications.</div></div>","PeriodicalId":430,"journal":{"name":"Solid State Communications","volume":"399 ","pages":"Article 115876"},"PeriodicalIF":2.1,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143444138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Exploring theoretical aspects of the thermodynamic, optical, structural, and electronic characteristics of the zinc-blend BexZn1-xO ternary alloy

IF 2.1 4区物理与天体物理 Q3 PHYSICS, CONDENSED MATTER

Solid State Communications

Pub Date : 2025-02-13 DOI: 10.1016/j.ssc.2025.115874

R. Moussa , F. Semari , Y. Seksak , H. Meradji , R. Khenata , S. Bin-Omran , W. Ahmed , Bakhtiar Ul Haq , A. Abdiche

This study was conducted using density functional theory (DFT) to examine the impact of the Be concentration on the thermodynamic, optoelectronic, and structural properties of cubic Be_xZn_1-xO ternary alloys. The determination of the structural properties was carried out through three distinct approximations. These properties demonstrated a nonlinear variation with the composition (x). Additionally, the band structures of both the alloys and binary compounds were determined via the TB-mBJ potential for predicting the electronic properties. The obtained results reveal that ZnO, Be_0.25Zn_0.75O, Be_0.5Zn_0.5O, and Be_0.75Zn_0.25O are direct bandgap semiconductors. The BeO compound is an insulator. Optical parameters, including the dielectric constant ε(ω), refractive index n(ω), and energy loss L(ω), were calculated and analyzed. Finally, the quasi harmonic Debye model was used to assess the specific thermodynamic characteristics of the alloys. The results presented in this study could prove valuable for advancing research in optoelectronic applications and power electronic devices.

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引用次数: 0

Effect of molar concentration on optoelectronic properties of α-Fe2O3 nanoparticles for n-α-Fe2O3/p-Si junction diode application

IF 2.1 4区物理与天体物理 Q3 PHYSICS, CONDENSED MATTER

Solid State Communications

Pub Date : 2025-02-12 DOI: 10.1016/j.ssc.2025.115873

P. Rajapandi , G. Viruthagiri , M. Vidhya , R. Marnadu , S. Arunkumar , K.S. Mohan , Mohd Shkir , M.A. Sayed

In present work, we have synthesized rhombohedral structured α-Fe₂O₃nanoparticles (NPs) for various molar concentrations of 0.25, 0.5, 0.75, and 1 M using a simple co-precipitate method. X-ray diffraction analysis confirmed the formation of single-phase rhombohedral structured α-Fe₂O₃ NPs. The Raman characteristic peaks exhibited a pure hematite phase, free from iron oxide and iron hydroxide impurities. FESEM showed a randomly oriented submicron-sized and irregular granular-shaped structure of the synthesized α-Fe₂O₃ NPs. The fundamental stretching and bending vibrations of chemical bonds and the existence of Fe‒O functional groups were captured from FTIR spectra. UV–Vis absorption spectral analysis showed a strong optical absorption peak in the range of 350–550 nm. Moreover, A minimum optical band gap of 1.7 eV as observed for 1 M of α-Fe₂O₃ NPs. Based on the beat outcome, we have developed n-α-Fe₂O₃/p-Si junction diode for 1 M of α-Fe₂O₃ NPs and measured forward and reverse current values for dark and light environments. Remarkably, the diode exhibited a lower ideality factor of 3.4 under light exposure. Furthermore, the n-α-Fe₂O₃/p-Si diode demonstrated a quantum efficiency of 38 % and a detectivity of 1.98 × 10¹⁰ Jones, indicating its potential for future optoelectronic applications. These results strongly support the suitability of the fabricated n-α-Fe₂O₃/p-Si diode for advanced optoelectronic technologies.

{"title":"Effect of molar concentration on optoelectronic properties of α-Fe2O3 nanoparticles for n-α-Fe2O3/p-Si junction diode application","authors":"P. Rajapandi , G. Viruthagiri , M. Vidhya , R. Marnadu , S. Arunkumar , K.S. Mohan , Mohd Shkir , M.A. Sayed","doi":"10.1016/j.ssc.2025.115873","DOIUrl":"10.1016/j.ssc.2025.115873","url":null,"abstract":"<div><div>In present work, we have synthesized rhombohedral structured α-Fe2O3nanoparticles (NPs) for various molar concentrations of 0.25, 0.5, 0.75, and 1 M using a simple co-precipitate method. X-ray diffraction analysis confirmed the formation of single-phase rhombohedral structured α-Fe2O3 NPs. The Raman characteristic peaks exhibited a pure hematite phase, free from iron oxide and iron hydroxide impurities. FESEM showed a randomly oriented submicron-sized and irregular granular-shaped structure of the synthesized α-Fe2O3 NPs. The fundamental stretching and bending vibrations of chemical bonds and the existence of Fe‒O functional groups were captured from FTIR spectra. UV–Vis absorption spectral analysis showed a strong optical absorption peak in the range of 350–550 nm. Moreover, A minimum optical band gap of 1.7 eV as observed for 1 M of α-Fe2O3 NPs. Based on the beat outcome, we have developed n-α-Fe2O3/p-Si junction diode for 1 M of α-Fe2O3 NPs and measured forward and reverse current values for dark and light environments. Remarkably, the diode exhibited a lower ideality factor of 3.4 under light exposure. Furthermore, the n-α-Fe2O3/p-Si diode demonstrated a quantum efficiency of 38 % and a detectivity of 1.98 × 1010 Jones, indicating its potential for future optoelectronic applications. These results strongly support the suitability of the fabricated n-α-Fe2O3/p-Si diode for advanced optoelectronic technologies.</div></div>","PeriodicalId":430,"journal":{"name":"Solid State Communications","volume":"399 ","pages":"Article 115873"},"PeriodicalIF":2.1,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143429889","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

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