| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Effect of oxygen content on dielectric characteristics of Cr-doped LaTiOx |
| Ming Ma(马铭)1, Yan Chen(陈彦)2, Yi-Min Cui(崔益民)2 |
1 School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China;
2 School of Physics, Beihang University, Beijing 100191, China |
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Abstract The ceramics La0.85Cr0.15TiOx and La0.7Cr0.3TiOx are prepared by conventional solid-state reaction method. The dielectric properties of Cr-doped LaTiOx as a function of frequency (0.1 kHz ≤ f ≤ 1 MHz) and temperature (77 K ≤ T ≤ 360 K) are studied. The blocks are then annealed in a flowing O2 or Ar/H2 to convert their oxygen content and the tests mentioned above are performed. The highly oxygenated samples exhibit extremely high low-frequency dielectric constants at room temperature (~106). The results show that the oxygen stoichiometry could significantly influence the dielectric properties of Cr-doped LaTiOx.
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Received: 16 December 2017
Revised: 17 January 2018
Accepted manuscript online:
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PACS:
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77.84.Bw
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(Elements, oxides, nitrides, borides, carbides, chalcogenides, etc.)
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77.22.Gm
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(Dielectric loss and relaxation)
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61.72.-y
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(Defects and impurities in crystals; microstructure)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No.51571006). |
Corresponding Authors:
Yan Chen
E-mail: chenyan@buaa.edu.cn
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Cite this article:
Ming Ma(马铭), Yan Chen(陈彦), Yi-Min Cui(崔益民) Effect of oxygen content on dielectric characteristics of Cr-doped LaTiOx 2018 Chin. Phys. B 27 057702
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