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首页> 外文期刊>Physica, C. Superconductivity and its applications >Oxygen tracer diffusion in the YBa(2)Cu(3)Oy superconductor
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Oxygen tracer diffusion in the YBa(2)Cu(3)Oy superconductor

机译:氧示踪剂在YBa(2)Cu(3)Oy超导体中的扩散

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The oxygen diffusion coefficient of YBa2Cu3Oy (YBCO) single crystals was determined by secondary ion mass spectrometry in a wide temperature range from 628 to 1073 K. It was found that the slope of the Arrhenius plot of the diffusion coefficient changes at the transition temperature from the orthorhombic to the tetragonal phase (TP). The activation energies of oxygen in the TP and the orthorhombic phase (OP) are 89.1 +/- 1.4 and 114.6 +/- 1 kJmol(-1) in the ab plane, and 284 +/- 2.8 and 126.9 +/- 0.5 kJmol(-1) in the c axis direction, respectively. In the OF, the activation energies in the ab plane and the c axis direction are almost the same, but the diffusion coefficients in the ab plane are larger than that in the c axis direction by more than three orders of magnitude. At higher temperatures of the TP, the slope of the Arrhenius plot in the c axis direction becomes larger and the diffusion coefficient of the c axis becomes closer to that of the ab plane towards the incongruent melting point of YBCO compounds. (C) 2001 Elsevier Science B.V. All rights reserved. [References: 13]
机译:YBa2Cu3Oy(YBCO)单晶的氧扩散系数是通过二次离子质谱在628至1073 K的较宽温度范围内测定的。发现,扩散系数的Arrhenius曲线的斜率随温度从转变温度变化而变化。正交四方相(TP)。 TP和正交相(OP)中的氧活化能在ab平面中分别为89.1 +/- 1.4和114.6 +/- 1 kJmol(-1),以及284 +/- 2.8和126.9 +/- 0.5 kJmol (-1)分别沿c轴方向。在OF中,ab平面和c轴方向的活化能几乎相同,但是ab平面中的扩散系数比c轴方向的扩散系数大三个数量级以上。在TP的较高温度下,Arrhenius曲线在c轴方向上的斜率变得更大,并且c轴的扩散系数朝着YBCO化合物的不同熔点逐渐靠近ab平面。 (C)2001 Elsevier Science B.V.保留所有权利。 [参考:13]

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