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Interdependence between electrical and magnetic properties of polycrystalline cobalt-substituted tungsten bronze multiferroic ceramics

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Journal of Advanced Dielectrics 2018年第1期8卷 17-24页

作者： Shilpi Jindal Sheela Devi Ajay Vasishth khalid mujasam batoo Gagan Kumar Department of Physics Chandigarh University MohaliPunjabIndia Department of Applied Sciences MSITC-4 JanakpuriNew DelhiIndia Department of Applied Sciences Chandigarh Engineering College MohaliPunjabIndia King Abdullah Institute for Nanotechnology King Saud University P.O.Box 2455 Riyadh 11451Saudi Arabia

Polycrystalline cobalt-substituted tungsten bronze ferroelectric ceramics with chemical composition Ba_(5)CaTi_(2-x)Co_(X)Nb_(8)O_(30)(x=0.00,0.02,0.04 and 0.08)were synthesized by solid state reaction technique.X-ray diffraction(XRD)technique was used to confirm the phase formation and it revealed the formation of single phase tetragonal structure with space group *** surface morphology of the samples was studied by using the scanning electron microscopy(SEM)*** dielectric properties such as dielectric constant and dielectric loss have been investigated as a function of temperature and *** P-E and M-H studies confirmed the coexistent of ferroelectricity and magnetism at room *** P-E loop study indicated an increase in the coercive field while the M-H study depicted a decrease in the magnetization with the incorporation of cobalt ions.

关键词： Tungsten bronze solid state reaction technique:electrical properties magnetic properties

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Construction of robust and durable Cu_(2)Se-V_(2)O_(5) nanosheet electrocatalyst for alkaline oxygen evolution reaction

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Frontiers of Chemical Science and Engineering 2024年第6期18卷 71-83页

作者： Tauseef Munawar Ambreen Bashir khalid mujasam batoo Saman Fatima Faisal Mukhtar Sajjad Hussain Sumaira Manzoor Muhammad Naeem Ashiq Shoukat Alim Khan Muammer Koc Faisal Iqbal Institute of Physics The Islamia University of BahawalpurBahawalpur 63100Pakistan King Abdullah Institute for Nanotechnology King Saud UniversityRiyadh 11451Saudi Arabia Hybrid Materials Center(HMC) Sejong UniversitySeoul 05006Republic of Korea Department of Nanotechnology and Advanced Materials Engineering Sejong UniversitySeoul 05006Republic of Korea Institute of Chemical Sciences Bahauddin Zakariya UniversityMultan 60800Pakistan Division of Sustainable Development College of Science and EngineeringHamad Bin Khalifa UniversityQatar FoundationDoha 34110Qatar

Reducing the production costs of clean energy carriers such as hydrogen through scalable water electrolysis is a potential solution for advancing the hydrogen *** the various material candidates,our group demonstrated transition-metal-based materials with tunable electronic characteristics,various phases,and ***,electrochemical water oxidation using Cu_(2)Se-V_(2)O_(5) as a non-precious metallic electrocatalyst via a hydrothermal approach is *** water-splitting performance of all the fabricated electrocatalysts was evaluated after direct growth on a stainless-steel *** electrochemically tuned Cu_(2)Se-V_(2)O_(5) catalyst exhibited a reduced overpotential of 128 mV and provided a reduced Tafel slope of 57 mV·dec^(−1) to meet the maximum current density of 250 mA·cm^(−2).The optimized strategy for interfacial coupling of the fabricated Cu_(2)Se-V_(2)O_(5) catalyst resulted in a porous structure with accessible active sites,which enabled adsorption of the intermediates and afforded an effective charge transfer rate for promoting the oxygen evolution ***,the combined effect of the catalyst components provided long-term stability for over 110 h in an alkaline solution,which makes the catalyst promising for large-scale practical *** aforementioned advantages of the composite catalyst overcome the limitations of low conductivity,agglomeration,and poor stability of the pure catalysts(Cu2Se and V2O5).

关键词： oxygen evolution reaction Cu_(2)Se-V_(2)O_(5)composite nanosheets metal-diffused ions accessible adsorption sites

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Giant energy harvesting potential in(100)-oriented 0.68PbMg_(1/3)Nb_(2/3)O_(3)-0.32PbTiO_(3)with Pb(Zr_(0.3)Ti_(0.7))O_(3)/PbO_(x)buffer layer and(001)-oriented 0.67PbMg_(1/3)Nb_(2/3)O_(3)-0.33PbTiO_(3)thin films

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Journal of Advanced Dielectrics 2014年第4期4卷 18-23页

作者： Gaurav Vats Himmat Singh Kushwaha Rahul Vaish Niyaz Ahamad Madhar Mohammed Shahabuddin Jafar M.Parakkandy khalid mujasam batoo School of Engineering Indian Institute of Technology Mandi Himachal Pradesh 175001 India Department of Physics and Astronomy P.O.Box No.2455 College of SciencesKing Saud University Riyadh 11451Kingdom of Saudi Arabia King Abdullah Institute of Nanotechnology P.O.Box No.2455 King Saud UniversityRiyadh 11451 Kingdom of Saudi Arabia

This work emphasis on the competence of(100)-oriented PMN–PT buffer layered(0.68PbMg_(1/3)Nb_(2/3)O_(3)–0.32PbTiO_(3)with Pb(Zr_(0.3)Ti_(0.7))O_(3)/PbO_(x)buffer layer)and(001)-oriented PMN–PT(0.67PbMg_(1/3)Nb_(2/3)O_(3)–0.33PbTiO_(3))for low grade thermal energy harvesting using Olsen *** analysis(based on well-reported experiments in literature)reveals that these films show colossal energy harnessing *** the films are found to have maximum harnessable energy densities(PMN–PT buffer layered:8 MJ/m^(3);PMN–PT:6.5 MJ/m^(3))in identical ambient conditions of 30–150℃and 0–600 kV/*** energy harnessing plausibility is found to be nearly five times higher than the previously reported values to date.

关键词： Giant energy harvesting thin films Olsen cycle

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