National Changhua University of Education Institutional Repository : Item 987654321/14178
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题名: Measurements of Anisotropic Thermopower of Magnetically Aligned YBa2Cu3O7−δCeramics: Evidence of Successful Texturing Techniques
作者: Liu, Chia-Jyi;Wu, T. W.;Downes, J.;Staines, M. P.
贡献者: 物理學系
关键词: Grain alignment;Thermopower;Anisotropy
日期: 2003-07
上传时间: 2012-09-10T06:14:00Z
出版者: Elsevier
摘要: Aligned YBa2Cu3O7−δ ceramics have been obtained using a field of 1 T without being embedded in epoxy. Thermopower, XRD, and SEM are used to characterize the aligned ceramics. For the sample with δ=0.05, the thermopower exhibits a strong anisotropy. The ab-plane thermopower behaves distinctly from that along the c-axis. The ab-plane thermopower shows remarkable similarities to that along the b-axis in an untwinned single crystal. The magnitude and temperature dependence of the c-axis thermopower are almost identical to those of a twinned single crystal. For samples with larger oxygen deficiency, the anisotropy remains. These measurements indicate that these ceramics are well aligned along their crystallographic directions. This also makes available the anisotropic thermopower measurements of ceramic samples by aligning polycrystallites using magnetic forces.
關聯: Physica C: Superconductivity, 390(4): 374-378
显示于类别:[物理學系] 期刊論文

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