Anisotropic electrical and magnetic properties in grain-oriented Bi4Ti3O12-La0.5Sr0.5MnO3

Wei Zou, Jianlin Wang, Zezhi Chen, Nai Shi, Zhiang Li, Zhangzhang Cui, Xiaoning Li, Xiaofeng Yin, Wensheng Yan, Haoliang Huang, Ranran Peng, Zhengping Fu, Yalin Lu

研究成果: ジャーナルへの寄稿学術誌査読

9 被引用数 (Scopus)

抄録

Aurivillius compounds have many fascinating properties such as ferroelectricity, magnetism, dielectricity, and piezoelectricity. Their structures and properties can be tuned flexibly, thus they have broad applications in FeRAM, spintronics, photocatalysts, capacitors, etc. We synthesized layer-inserted Aurivillius phase semiconducting Bi4Ti3O12-La0.5Sr0.5MnO3 (BIT-LSMO) nanoparticles by the hydrothermal method and subsequently obtained highly grain-oriented ceramics (Lotgering factor LF = 98.69% for muffle calcined samples and 99.87% for hot-pressed samples) by calcination. Significant electrical anisotropy at room temperature (the resistivity magnitude of the out-of-plane direction is about an order larger than that of the in-plane direction) and magnetic anisotropy at low temperature in the oriented ceramics were observed. Through the grain boundary conductivity estimation with the "brick layer" mode, we concluded that the anisotropy originates from the anisotropy within grain interiors for the Aurivillius layered structure rather than the contribution of grain boundary density difference. The transport path is "blocked" to some extent along the c-direction since hole hopping through the Mn4+-O2--Mn3+ double exchange effect is the main conducting mechanism in our samples. The oxygen vacancies and element valence states of samples using different synthesis processes were investigated. The oxygen vacancies increase and the lattice shrinks during the sintering process due to the volatilization of bismuth element. The valence state of Ti is less than but near to +4, and the valence state of Mn is about +3.4. The electrical and magnetic anisotropies in BIT-LSMO provide an additional freedom in functional applications for layered complex oxides.

本文言語英語
ページ(範囲)11272-11279
ページ数8
ジャーナルJournal of Materials Chemistry C
6
42
DOI
出版ステータス出版済み - 2018
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 化学 (全般)
  • 材料化学

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