Enhanced intrinsic permittivity and bulk response in Y2/3Cu3Ti4+xO12 ceramics |
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| Affiliation: | 1. Department of Physics, Faculty of Science, Naresuan University, Phitsanulok 65000, Thailand;2. Research Center for Academic Excellent in Applied Physics, Faculty of Science, Naresuan University, Phitsanulok 65000, Thailand;3. Materials Science, School of Mechanical Industrial and Manufacturing Engineering Oregon State University, Corvallis, OR 97331, USA;1. State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, PR China;2. State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, PR China;1. Key Laboratory for Macromolecular Science of Shaanxi Province, School of Materials Science and Engineering, Shaanxi Normal University, Xi’an, 710062 Shaanxi, PR China;2. Shaanxi Key Laboratory for Advanced Energy Devices, School of Materials Science and Engineering, Shaanxi Normal University, Xi’an, 710062 Shaanxi, PR China;3. School of Physics & Information Technology, Shaanxi Normal University, PR China;1. Department of Physics, Guru Jambheshwar University of Science and Technology, Hisar 125001, Haryana, India;2. Department of Physics, Maharshi Dayanand University, Rohtak 124001, India |
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| Abstract: | Considering the contribution of the mixed valence structure of Ti3+ and Ti4+ to the semiconductivity of grain, compositions with the formula of Y2/3Cu3Ti4+xO12 were designed and prepared. The dielectric bulk responses of Y2/3Cu3Ti4+xO12 ceramics were explored in detail. Changing Ti stoichiometry gives rise to an increase of the intrinsic permittivity. Y2/3Cu3Ti3.925O12 ceramic exhibits a higher intrinsic permittivity of ~120 at 60 MHz than that of pure Y2/3Cu3Ti4O12 ceramics (87 at 60 MHz). Additionally, the activation energies of bulk responses are significantly enhanced by changing Ti stoichiometry, which is closely linked with the increase of Ti3+/Ti4+. |
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| Keywords: | Intrinsic permittivity Bulk response Ti stoichiometry Mixed valence structure |
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