Effect of oxygen content on dielectric characteristics of Cr-doped LaTiOx

doi:10.1088/1674-1056/27/5/057702

中国物理B ›› 2018, Vol. 27 ›› Issue (5): 57702-057702.doi: 10.1088/1674-1056/27/5/057702

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Effect of oxygen content on dielectric characteristics of Cr-doped LaTiO_x

Ming Ma(马铭), Yan Chen(陈彦), Yi-Min Cui(崔益民)

1 School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China;
2 School of Physics, Beihang University, Beijing 100191, China

收稿日期:2017-12-16 修回日期:2018-01-17 出版日期:2018-05-05 发布日期:2018-05-05
通讯作者: Yan Chen E-mail:chenyan@buaa.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No.51571006).

Effect of oxygen content on dielectric characteristics of Cr-doped LaTiO_x

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

Received:2017-12-16 Revised:2018-01-17 Online:2018-05-05 Published:2018-05-05
Contact: Yan Chen E-mail:chenyan@buaa.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No.51571006).

摘要/Abstract

摘要： The ceramics La_0.85Cr_0.15TiO_x and La_0.7Cr_0.3TiO_x are prepared by conventional solid-state reaction method. The dielectric properties of Cr-doped LaTiO_x 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 LaTiO_x.

关键词: oxygen content, dielectric characteristics, LaTiO_x

Abstract: The ceramics La_0.85Cr_0.15TiO_x and La_0.7Cr_0.3TiO_x are prepared by conventional solid-state reaction method. The dielectric properties of Cr-doped LaTiO_x 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 LaTiO_x.

Key words: oxygen content, dielectric characteristics, LaTiO_x

中图分类号: (Elements, oxides, nitrides, borides, carbides, chalcogenides, etc.)

77.84.Bw

77.22.Gm (Dielectric loss and relaxation) 61.72.-y (Defects and impurities in crystals; microstructure)

马铭, 陈彦, 崔益民. Effect of oxygen content on dielectric characteristics of Cr-doped LaTiO_x[J]. 中国物理B, 2018, 27(5): 57702-057702.

Ming Ma(马铭), Yan Chen(陈彦), Yi-Min Cui(崔益民). Effect of oxygen content on dielectric characteristics of Cr-doped LaTiO_x[J]. Chin. Phys. B, 2018, 27(5): 57702-057702.

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Effect of oxygen content on dielectric characteristics of Cr-doped LaTiO_x

Effect of oxygen content on dielectric characteristics of Cr-doped LaTiO_x

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