The high-Tc phase in Bi-Pb-Sr-Ca-Cu-O system

Autor:	Akira Doi, Kazuhiro Yamaguchi, Hirotugu Susami, Kenji Ishizaka, Toshio Takada
Rok vydání:	1990
Předmět:	Materials science Mechanical Engineering Metals and Alloys Partial melting Analytical chemistry Industrial and Manufacturing Engineering law.invention Relative Volume Electrical resistivity and conductivity law Phase (matter) Heating temperature Materials Chemistry Calcination
Zdroj:	Journal of the Japan Society of Powder and Powder Metallurgy. 37:820-824
ISSN:	1880-9014 0532-8799
DOI:	10.2497/jjspm.37.820
Popis:	The XRD experiments and the measurements of electrical resistivity were conducted for the sample with a composition of Bi : Pb : Sr : Ca : Cu = 0.7 : 0.3 : 1.0 : 1.0 : 1.8 heated at temperatures from 842 to 849°C for 120h. Partial melting in the samples calcined at 800°C for 12h occurs at 835 °C, being much lower compared with that in the samples with compositions for the high-Tc monophase reported so far. Relative volume fraction of the high-Tc phase gradually increases as heating temperature increases below 846°C, while markedly increases at 847 and 848°C. Tc also depends upon the heating temperature. The samples heated at temperatures below 846°C shows Tc around 105K. Tc reaches 110K for the samples heated at 847 and 848°C. These results reveal that optimum temperatures for Tc and the formation of the high-Tc phase are 847 and 848 °C just below the decomposing temperature of the low-Tc phase.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::dcf38b5d64da5593e9a7d64f8c655d27 https://doi.org/10.2497/jjspm.37.820 Zobrazit plný text záznamu