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    題名: Preparation and Superconductivity of a Series of Bi2CaSr(subscript (2-x))Ba(subscript x)Cu2O(subscript (8+δ))
    其他題名: Preparation and superconductivity of a series of Bi2CaSr2-xBaxCu2O8+x
    作者: 王年豪;Wang, Nein-hour;高惠春;Kao, Huey-chuen I.
    貢獻者: 淡江大學化學學系
    關鍵詞: High-Tc Superconductor;Bi-Ca-Sr-Cu-O System;Ba Substitution;Citrate Precursor;Iodometric Titration;X-Ray Diffraction;Resistivity;Meissner Effect;高溫超導體;鉍-鈣-鍶-銅-氧系統;鋇取代;檸檬酸先質;碘量滴定法;X-光繞射;電阻
    日期: 1989-06
    上傳時間: 2013-07-29 13:40:22 (UTC+8)
    出版者: 臺北市:中國化學學會
    摘要: By means of the addition of Ba into the Bi-Ca-Sr-Cu-O 2122 system, a series of Bi/sub 2/CaSr/sub 2-x/Ba/sub x/Cu/sub 2/O/sub 8+.delta./(0.ltoreq.x.ltoreq.2) quinary metal oxides were prepared by the citrate route and by the conventional powder reaction method. The samples prepared by the former method have better properties than the latter. It was found that.delta. was not equal to zero for all of them and that it increased with decreasing Tc. Two phases were identified in the oxides containing all five metal elements. One is the Bi-Ca-Sr-Cu-O 2122 phase, the other is a new insulating phase which probably contains Bi-Ca-Ba-Cu-O with undetermined stoichiometry. Superconductivity was found in those samples for which x.ltoreq.1.50 with their Tc onsets between 93-78 K by resistivity measurements. Superconductivity decreased monotonically with increasing x. However, residual resistance was found in those samples for which 1.00.ltoreq.x.ltoreq.1.50. The Meissner effect appears in the samples where x.ltoreq.1.00 with Tc onsets between 88-80 K. For x=1.75 and 2.00, the samples were semiconductors with resistivities of 6.66*10/sup 2/ and 6.96*10/sup 3/.OMEGA..bcdot.cm at 290K, and activation energies of 0.109, and 0.298eV, respectively.
    關聯: Journal of the Chinese Chemical Society=中國化學會會誌 36(3), pp.205-210
    DOI: 10.1002/jccs.198900031
    顯示於類別:[化學工程與材料工程學系暨研究所] 期刊論文

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