Variable nature of twin boundaries in YBa2Cu3O7- delta and its alloys.
Variable nature of twin boundaries in YBa2Cu3O7- delta and its alloys.
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YBa2Cu3O7-δ 及其合金中孪晶界的变化性质。
DOI：
10.1103/physrevb.44.2871
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
David O. Welch
中科院分区：
文献类型：
--
作者：
Yimei Zhu;M. Suenaga;J. Tafto;David O. Welch
高分辨率电子显微镜和电子衍射表明，当{δ}{约}0和{δ M}=Ni、Zn、Al、Fe、Cu时，YBa{sub 2}(Cu{sub 0.98}{ital M0.02}){sub 3}O{sub 7}{minus}{delta}}时，CuO层中的O原子以（110）平面为中心形成孪晶界，同时阳离子亚晶格越过晶界发生位移。缺氧导致孪晶界中心通过阳离子向（110）面移动，消除了阳离子-亚晶格位移，而溶质{ital M}=Al或Fe（即使氧含量超过7.00）大大降低了阳离子-亚晶格位移的幅度。
High-resolution electron microscopy and electron diffraction of YBa{sub 2}(Cu{sub 0.98}{ital M0.02}){sub 3}O{sub 7{minus}{delta}} with {ital M}=Zn, Ni, Al, Fe, Cu indicate that twin boundaries are centered on (110) planes through the O atoms in the CuO layer for {delta}{approx}0 and {ital M}=Ni, Zn, or Cu, accompanied by a displacement of the cation sublattices across the boundary. Oxygen deficiency causes a shift of the center of twin boundaries to (110) planes through the cations and eliminates the cation-sublattice displacement, while solutes {ital M}=Al or Fe (even for oxygen content in excess of 7.00) substantially reduce the magnitude of the cation-sublattice displacement.