Anomalous Critical Temperature over 200 K in Multiphase Tl-Ba-Ca-Cu-O System
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概要
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Anomalous critical temperatures of over 200 K were recorded for multiphase samples with the nominal composition of TlBa_2Ca_3Cu_4O_<10.5>. The formation of the samples was found to be critically dependent on the sintering temperature and time. The results of energy dispersive X-ray spectrometry (EDX) analysis showed that the atomic ratios for these samples were Tl:Ba:Ca:Cu=0.19±0.05:1.94±0.09:2.63±0.16:4.00. The X-ray photoelectron spectroscopy (XPS) spectra of T14f, Ba3d, Cu2p and Ols partially consisted of high-binding-energy components. We interpret them to result from an electron transfer reaction such as Tl_2O_3+2CuO→2Tl_2+Cu_2O_3.
- 社団法人応用物理学会の論文
- 1991-12-01
著者
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Yasuyama Sigeyuki
Department Of Applied Chemistry Faculty Of Engineering Kumamoto University
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JYODOI Kouki
Department of Bioengineering, Yatsushiro National College of Technology
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Fukushima Keiji
Department Of Applied Chemistry Faculty Of Engineering Kumamoto University
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SONODA Akihisa
Department of Applied Chemistry, Faculty of Engineering, Kumamoto University
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OHYOSHI Akira
Department of Applied Chemistry, Faculty of Engineering, Kumamoto University
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Jyodoi Kouki
Department Of Applied Chemistry Faculty Of Engineering Kumamoto University
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Sonoda Akihisa
Department Of Applied Chemistry Faculty Of Engineering Kumamoto University
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Ohyoshi Akira
Department Of Applied Chemistry Faculty Of Engineering Kumamoto University
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