The European Physical Journal Applied Physics最新文献

{"title":"Three mechanical relaxation modes associated with nanoscale structural heterogeneity in Pd42.5Ni7.5Cu30P20 fragile glass","authors":"Hao Wang, T. Ichitsubo, Hidemi Kato","doi":"10.1051/epjap/2022220266","DOIUrl":"https://doi.org/10.1051/epjap/2022220266","url":null,"abstract":"The dynamic relaxation behavior of Pd42.5Ni7.5Cu30P20 metallic glass was studied at 173–563 K (~0.98Tg) and at angular frequency 10^(−2)–10^(2) rad s−1. Master curves of 16-digit dynamic moduli at angular frequency 10^(-4)–10^12 rad s^(-1) were constructed and characterized by the stretched exponent relaxation function, which exhibits three discrete relaxation modes with different activation energies, i.e., α-relaxation (7.98 eV) associated with the cooperative motion of ~5 atoms, slow β-relaxation (1.39 eV) associated with single atomic diffusion, and fast β-relaxation (0.25 eV) associated with rattling motion. These three modes were also detected as slope changes on the quasi-static creep compliance under an isochronal heating process, which was successfully reproduced by dynamic complex compliance using the dynamic moduli with fitting parameters related to the considerable inhomogeneous structural characteristics, elastic modulus and volume fraction, generated in the glass.","PeriodicalId":301303,"journal":{"name":"The European Physical Journal Applied Physics","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116099417","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"EDITORIAL - Materials for Energy Harvesting, Conversion, Storage, Environmental Engineering and Sustainability","authors":"M. El Jouad, M. El Ganaoui, R. Bennacer, J. Nunzi","doi":"10.1051/epjap/2022220292","DOIUrl":"https://doi.org/10.1051/epjap/2022220292","url":null,"abstract":"1 Chouaib Doukkali University, National School of Applied Science (ENSA), Science Engineer Laboratory for Energy (LabSIPE), El Jadida, Morocco 2 Lorraine University, Lermab Lab, IUT Longwy, 186 Rue Lorraine, Longwy 54400, France 3 LMT/ENS-Paris-Saclay/CNRS/Université Paris Saclay, 4 Avenue des Sciences 91190 Gif sur Yvette, France 4 Queens University, Department of Chemistry, Department of Physics, Engineering Physics & Astronomy, Kingston, ON K7L-3N6, Canada","PeriodicalId":301303,"journal":{"name":"The European Physical Journal Applied Physics","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128792176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydrogenation shrinks the colossal permittivity of Sb/Co co-doped TiO2 nanoparticles- structural & optical investigations","authors":"A. A Dakhel","doi":"10.1051/epjap/2022220228","DOIUrl":"https://doi.org/10.1051/epjap/2022220228","url":null,"abstract":"Pristine and (Sb/Co)-codoped TiO2 anatase powders were synthesized by hydrothermal method and some of the samples were hydrogenated. The samples were characterized by traditional techniques: X-rays, optical diffuse reflection spectroscopy (DRS), and ac-electrical measurements. It was observed that the (Sb/Co) codoping induces the growth of the anatase. The generation of an intermediate band clarified the optical absorption investigation in the bandgap of TiO2. The catalysis power of the Co2+ ions to the adsorbed H2-dissociation strongly supports the optical absorption strength. The Sb5+/Co2+ codoping could generate weak colossal permittivity, which was lowered by ~50% with hydrogenation. Such significant results were studied and explained.","PeriodicalId":301303,"journal":{"name":"The European Physical Journal Applied Physics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130963215","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microstructure and electrical transport properties of nanoscale [(Co40Fe40B20)34(SiO2)66/(In2O3)/C]46 multilayers","authors":"Yaroslav A. Peshkov, S. Ivkov, A. Lenshin, A. Sitnikov, Yu. A. Yurakov","doi":"10.1051/epjap/2022220256","DOIUrl":"https://doi.org/10.1051/epjap/2022220256","url":null,"abstract":"We investigated the role of microstructure and In2O3/C interlayer thickness on the electrical transport properties of [(Co40Fe40B20)34(SiO2)66/(In2O3)/C]46 multilayers prepared using ion-beam sputtering. These multilayers were characterized using an X-ray diffraction, X-ray reflectivity, impedance spectroscopy, and magnetoresistive measurements. The X-ray diffraction data showed that regardless of the layer thickness, all components of the multilayers are X-ray amorphous. Fitting X-ray reflectivity data, multilayer periodicities are extracted and layers thicknesses, densities and roughnesses are determined. Impedance spectroscopy has shown a resistive-capacitive coupling between electrically conductive ferromagnetic CoFeB clusters which corresponds to the model of a prepercolation composite. For the thinnest multilayer with nonmagnetic In2O3/C interlayer thickness of about 1.6 nm, we managed to achieve a magnetoresistance of about 0.8% at room temperature and 3.2% at cryogenic temperature.","PeriodicalId":301303,"journal":{"name":"The European Physical Journal Applied Physics","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114526863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Self-powered heterojunction ultraviolet photodetector based on NiO nanosheets/TiO2 nanorods","authors":"S. Shi, Rui Cao","doi":"10.1051/epjap/2022220217","DOIUrl":"https://doi.org/10.1051/epjap/2022220217","url":null,"abstract":"NiO/TiO2 heterojunction devices were fabricated through growing NiO nanosheets by hydrothermal method on TiO2 NRs and their UV photoresponse properties were examined. The crystal structure, and optical properties of heterojunction is characterized by XRD, Raman spectrum, absorption and PL. The results of XPS valence band spectrum, M-S curves and EIS curves for NiO/TiO2 heterojunctions revealed that the separation and transfer of the photo-generated carriers occur in heterojunction interface. The heterojunction devices exhibit a large responsivity of 0.54 A/W and a high detection sensitivity of 6.0×1012 Jones under UV illumination with wavelength of 370 nm at zero bias.","PeriodicalId":301303,"journal":{"name":"The European Physical Journal Applied Physics","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128561396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nano-voids formation at the interaction sites of shear bands in a Zr-based metallic glass","authors":"Z. Dong, Dongpeng Wang, Yicheng Wu, Y. Geng, Fugang Chen, P. Guo, Yaoxin Qiao, Xin Li, Yuxin Wang","doi":"10.1051/epjap/2022220284","DOIUrl":"https://doi.org/10.1051/epjap/2022220284","url":null,"abstract":"Understanding the formation mechanism of voids is a significant issue in controlling the catastrophic fracture in the form of shear bands in metallic glasses. Here, using an amplitude-modulation atomic force microscope, we investigated the nano-voids formation at the mutual interaction of shear bands in a Cu50Zr50 metallic glass. The results of phase shift revealed higher energy dissipation and more soft zones for the nano-voids. The formation of these nano-voids results from tensile stress concentration caused by the interaction of shear bands, based on the results of finite element simulation. The appearance of nano-voids and stress distribution at the site of shear band interaction is essential in understanding the plastic deformation and fracture of metallic glasses.","PeriodicalId":301303,"journal":{"name":"The European Physical Journal Applied Physics","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116867307","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microstructure and mechanical properties of particle reinforced high-temperature titanium composites","authors":"Vitus Mwinteribo Tabie, James Kwasi Quaisie, Jianwei Li, Philip Yamba, Xiaojing Xu","doi":"10.1051/epjap/2022220254","DOIUrl":"https://doi.org/10.1051/epjap/2022220254","url":null,"abstract":"In this research, a novel high-temperature titanium alloy, Ti750, was used as matrix and SiCp, SiCw, B4C, and GNPs as reinforcements to prepare both ex-situ and in-situ composites using spark plasma sintering process. The microstructure and mechanical properties of the samples were then examined and evaluated. The results show that the microstructures and phase compositions of the ex-situ composites contain mainly SiC particles homogeneously distributed in the α-Ti matrix. The in-situ synthesized composite, however, mainly contains TiC and Ti5Si3 reinforced phases in the Ti-rich matrix. The in-situ composite had the best mechanical properties among all the materials. It recorded 1164 HV and 924 MPa in Vickers microhardness and room temperature compressive tests respectively. It also had the lowest apparent porosity (4.89%) among the composites but slightly higher than matrix material (4.67%). The in-situ composite thus presents a better option to the Ti750 alloy which is currently used for high-temperature applications.","PeriodicalId":301303,"journal":{"name":"The European Physical Journal Applied Physics","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124763821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Variations in composition and structure occurring in multicomponent alloy targets during their service term","authors":"L. Shaginyan, M. Mironov, S. Firstov, Nicolay A. Krapivka, Valery V. Kremetsky, V. N. Novichenko","doi":"10.1051/epjap/2022220220","DOIUrl":"https://doi.org/10.1051/epjap/2022220220","url":null,"abstract":"Abstract. Main part of the magnetron sputtering (MS) technology is a target that serves as a source for film/coating material. The target properties directly influence the properties of a film/coating deposited by MS. The target composition and microstructure may change during its exploitation, especially if the target has complex composition, e.g., multicomponent alloy. However, only a small part of the target in the MS serves as a source of film-forming particles. This is an erosion zone, an annular groove, which forms over time under the ion bombardment (IB) of the target. Usually, the groove area is about 25% of the target square while the rest square remains unchanged. As the groove develops, the composition and angle of expansion of the film-forming particles change, that affects the composition and thickness uniformity of the film. Therefore, the information of the composition and microstructure of the groove at the end of the target's service term allows predicting the possible changes in the properties of the film. In view of the told above, we used SEM and microanalysis to study the structure and composition of the grooves of CoCrCuFeNi, CoCrCuFeMnNi, AlCoCrCuFeNiV high entropy alloy targets at the beginning and at the end of their service. Initial microstructure of the surface of all targets was smooth and flat and composed of matrix and inclusions homogenously distributed in the matrix. The microrelief of the bottom and side walls of the grooves was different and depended on the intensity of the IB. In the area of strong IB the microrelief acquired features of a melted surface. In the area of moderate IB the microrelief was crossed in various directions by micro-trenches of various length and width. It was revealed that the shapes and distribution of these micro-trenches coincided with those of the inclusions observed on the original targets surfaces. It was also revealed that at the end of the service term the composition of the grooves became depleted with elements with maximal enthalpy of formation. Analysis of the obtained results led us to the following conclusions: (i) the signs of melting on the targets surfaces indicate that its temperature is close to the melting temperatures of the alloys; (ii) a new type of the effect of preferential sputtering has been established. The main condition for its existence is the presence in the target composition of the second phase in the form of microinclusions, which sputtering yield is noticeably higher than of the components of the first phase; (iii) the formation of specific microrelief on the targets surfaces upon IB with ions with energy typical for DC MS is a result of the combined action of two factors: high temperature and sputtering. \u0000Key words: DC MS, target, high entropy alloys, composition, structure \u0000 \u0000","PeriodicalId":301303,"journal":{"name":"The European Physical Journal Applied Physics","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115778078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"PVDF–HFP/PZT Nanocomposite thin films: Preparation, Structure and Piezoelectric Properties","authors":"K. Oumghar, N. Chakhchaoui, Mohamed Assal, A. Eddiai, M. El Achaby, M. Meddad, O. Cherkaoui, A. M’hamed Mazroui","doi":"10.1051/epjap/2022220111","DOIUrl":"https://doi.org/10.1051/epjap/2022220111","url":null,"abstract":"Piezoelectric nanocomposites have attracted considerable attention from researchers in these last years due to their wide field in the development of electromechanical microsystems (MEMS) for energy harvesting applications. In this paper, piezoelectric lead titanate zirconate (PZT) are used with poly (vinylidene fluoride-hexafuoropropylene) (PVdF-HFP) polymer matrix to prepare the piezo thin nanocomposite film. An improvement in the β phase in PVdF-HFP was created by the reaction between the PZT nanoparticles and PVdF-HFP and the process used for the preparation of the film, resulting enhancement in ferroelectric and piezoelectric properties over neat PVdF-HFP. These polymer nanocomposite films were done by solvent casting method under ultrasonication using N, N-Dimethyl Acetamide (DMAc) as a solvent, with different percentages of PZT. The results confirm that PZT nanoparticles incorporated into the PVDF-HFP matrix cause an increase in the phase fraction, opening the way for efficient energy harvesting applications in the future.","PeriodicalId":301303,"journal":{"name":"The European Physical Journal Applied Physics","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129826075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"SYNTHESIS AND PROPERTIES OF PYRRHOTITE ASH BASED CUBICAL α-Fe2O3 NANOPARTICLES","authors":"B. Hatimi, J. Mouldar, A. Loudiki, M. Bensemlali, L. El Gaini, A. Hajjaji, Moulay Abderrahim El Mhammedi, M. Bakasse","doi":"10.1051/epjap/2022220073","DOIUrl":"https://doi.org/10.1051/epjap/2022220073","url":null,"abstract":"Pyrrhotite ash is a solid waste widely generated from phosphate industry has been used in the present research as a based material for α-Fe2O3 nanoparticles synthesis. The iron extraction conditions from Pyrrhotite ash using hydrochloric acid were carried out under the optimized conditions. The obtained FeCl3 was deployed in the elaboration of hematite (α-Fe2O3) nanoparticles using co-precitation method where green tea extract was deployed as a reducing and capping agent. The prepared α-Fe2O3 nanoparticles were characterized by XRD, SEM, FTIR and BET technics. The prepared sample consists of cubical or spherical microporous nanoparticles with size ranging 56 to 116 nm and an average pore size of 0.78 nm. The elaborated nanoparticles are of high purity having a crystalline size at rage of 18.33-24.55 nm. The optical properties were investigated using UV–visible spectroscopy, the maximum visible light absorbance was observed at 350 nm while the corresponding gap band was determined as 2.11 eV. Furthermore, the Vibrating-sample magnetometer was used in order to examine the magnetic properties of the nanoparticles that appropriate a ferromagnetic behavior with high Ms, Mr, and Hc values of 14.59 emu/g and 4.72 emu/g -769.35 Oe.","PeriodicalId":301303,"journal":{"name":"The European Physical Journal Applied Physics","volume":"131 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122991432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}