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Transient heat-flux method for measuring heat capacity: Examples from Cu and VO2 测量热容量的瞬态热流法：以铜和 VO2 为例
IF 2.4 4区 物理与天体物理
Current Applied Physics Pub Date : 2024-11-13 DOI: 10.1016/j.cap.2024.11.005
Dongjin Jang , Minsik Kong , Jong Mok Ok
{"title":"Transient heat-flux method for measuring heat capacity: Examples from Cu and VO2","authors":"Dongjin Jang ,&nbsp;Minsik Kong ,&nbsp;Jong Mok Ok","doi":"10.1016/j.cap.2024.11.005","DOIUrl":"10.1016/j.cap.2024.11.005","url":null,"abstract":"<div><div>Many quantum materials undergo phase transitions above room temperature. However, thermodynamic evidence of these phase transitions is relatively scarce. For instance, detailed specific heat anomalies have rarely been reported for the transitions. In addition to considering intrinsic factors that obscure the thermodynamic manifestation of relevant degrees of freedom, it is also important to revisit measurement techniques based on firmly established physical principles. In this study, we introduce a transient heat-flux method for measuring heat capacity of solids, and report a specific heat anomaly in VO<sub>2</sub>, along with the reproduction of the standard specific heat capacity data of Cu. At present, our method is capable of measuring heat capacities ranging from 1 J/mol⋅K to 400 J/mol⋅K with an uncertainty of 5% across a temperature range from room temperature to 100 °C.</div></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"69 ","pages":"Pages 55-59"},"PeriodicalIF":2.4,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662099","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Permeability modulation of Fe-Ni/nanoparticle (Ni, Zn) soft magnetic composites 铁-镍/纳米粒子（镍、锌）软磁复合材料的渗透性调制
IF 2.4 4区 物理与天体物理
Current Applied Physics Pub Date : 2024-11-05 DOI: 10.1016/j.cap.2024.10.016
Sang Woo Kim, Yeon Jun Choi, Ye Rae Kim, Deok Hyeon Kim, Ye Jin In, Tae Han Kim, Bo Wha Lee
{"title":"Permeability modulation of Fe-Ni/nanoparticle (Ni, Zn) soft magnetic composites","authors":"Sang Woo Kim,&nbsp;Yeon Jun Choi,&nbsp;Ye Rae Kim,&nbsp;Deok Hyeon Kim,&nbsp;Ye Jin In,&nbsp;Tae Han Kim,&nbsp;Bo Wha Lee","doi":"10.1016/j.cap.2024.10.016","DOIUrl":"10.1016/j.cap.2024.10.016","url":null,"abstract":"<div><div>In this study, we investigated how adding nanopowders to a micropowder affects the packing fraction and permeability. The micropowder used was a Fe-Ni crystalline alloy, which was sieved to less than 38 μm to minimize the effect of particle size distribution. The nanopowders, magnetic Ni and nonmagnetic Zn, were added to the Fe-Ni at weight ratios of 95:5, 90:10, 85:15, and 80:20. The results showed that the permeability of Fe-Ni was higher when sieved to 38 μm compared to the overall particle size. When the magnetic Ni nanopowder was added to the Fe-Ni powder sieved to 38 μm, both the packing fraction and permeability increased up to a ratio of 85:15 and then decreased. On the other hand, when the nonmagnetic Zn nanopowder was added, the packing fraction increased up to a ratio of 85:15 and then decreased, while the permeability continued to decrease.</div></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"69 ","pages":"Pages 42-46"},"PeriodicalIF":2.4,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662100","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
Effect of cadmium sulphide on poly (ethyl methacrylate) (PEMA) based electrolyte nanocomposite and its application in dye sensitized solar cell (DSSC) 硫化镉对聚（甲基丙烯酸乙酯）（PEMA）电解质纳米复合材料的影响及其在染料敏化太阳能电池（DSSC）中的应用
IF 2.4 4区 物理与天体物理
Current Applied Physics Pub Date : 2024-11-02 DOI: 10.1016/j.cap.2024.10.017
Palvinder Singh , Amit Sachdeva , Parmod K. Singh , M.Z.A. Yahya , S.N.F. Yusuf , Markus Diantoro , Famiza Abdul Latif
{"title":"Effect of cadmium sulphide on poly (ethyl methacrylate) (PEMA) based electrolyte nanocomposite and its application in dye sensitized solar cell (DSSC)","authors":"Palvinder Singh ,&nbsp;Amit Sachdeva ,&nbsp;Parmod K. Singh ,&nbsp;M.Z.A. Yahya ,&nbsp;S.N.F. Yusuf ,&nbsp;Markus Diantoro ,&nbsp;Famiza Abdul Latif","doi":"10.1016/j.cap.2024.10.017","DOIUrl":"10.1016/j.cap.2024.10.017","url":null,"abstract":"<div><div>The detail study of structural and ionic conductivity characterization of Poly (ethyl methacrylate) (PEMA) based polymer composite electrolyte were modified by the incorporation of Cadmium sulphide (CdS) nanomaterial. PEMA in addition with 40 % wt. potassium iodide (KI) and ethylene carbonate (EC) having 60 % wt., has the highest ionic conductivity of 4.65 × 10<sup>−5</sup> S/cm when employed the solution casting technique. Cadmium Sulphide (CdS) was incorporated with PEMA + KI 40 % wt. + EC 60 % wt. sample to get maximum conductivity sample. The highest ionic conductivity 2.65×10<sup>−3</sup>S/cm, was attained at 7 % weight percentage of Cadmium sulphide (CdS). The conductive sample's morphology was examined using SEM, its amorphicity and crystalline structure was investigated using Fourier transform infrared (FTIR) technique, and FTIR 'wavenumbers of the maximum conductive sample of PEMA polymer + KI salt + EC plastizer and PEMA polymer + KI salt + EC plastizer + CdS nanoparticles were compared. X-ray diffraction (XRD) was used to identify the amorphous nature of the maximum conductive sample of polymer composite electrolyte. Differential scanning calorimetry (DSC) analysis was used to find out the glass transition (Tg) temperature of maximum conducting sample of polymer composite. The doctor blade method was employed to develop the dye sensitized solar cell (DSSC), and it had been observed that, under one sunlight situation, the energy conversion efficiency was 2.09 %, having parameters fill factor was 79.77 %.</div></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"69 ","pages":"Pages 36-41"},"PeriodicalIF":2.4,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662101","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
Strain-dependent Rashba effect, and spin Hall conductivity in the altermagnetic Janus V2SeTeO monolayer 随应变变化的拉什巴效应，以及变磁性 Janus V2SeTeO 单层中的自旋霍尔电导率
IF 2.4 4区 物理与天体物理
Current Applied Physics Pub Date : 2024-10-30 DOI: 10.1016/j.cap.2024.10.014
Brahim Marfoua , Jisang Hong
{"title":"Strain-dependent Rashba effect, and spin Hall conductivity in the altermagnetic Janus V2SeTeO monolayer","authors":"Brahim Marfoua ,&nbsp;Jisang Hong","doi":"10.1016/j.cap.2024.10.014","DOIUrl":"10.1016/j.cap.2024.10.014","url":null,"abstract":"<div><div>Altermagnets represent a distinctive class of antiferromagnetic materials characterized by non-overlapping spin bands and attract extensive research efforts. Herein, we investigate the interplay among electronic, magnetic, and spin transport phenomena of the Janus V<sub>2</sub>SeTeO monolayer. The Janus monolayer has a direct band gap of 0.32 eV. The Janus V<sub>2</sub>SeTeO layer has an in-plane magnetic anisotropy along (110) direction. The incorporation of spin-orbit coupling (SOC) induces a Rashba-type band structure with a Rashba coefficient of 1.02 eV Å. The Rashba coefficient is insensitive to the compressive strain. In contrast, it is suppressed with tensile strain and becomes almost zero at 3 % tensile strain. The maximum SHC of around ∼ −65 (ℏ/e)S/cm is achieved with hole doping. The magnitudes of SHC remain comparable to those in typical topological materials. Overall, this investigation provides fundamental insights into the magnetic, Rashba, and spin transport properties of the Janus V<sub>2</sub>SeTeO altermagnet monolayer.</div></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"69 ","pages":"Pages 47-54"},"PeriodicalIF":2.4,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662098","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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