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Author Mozhaev, A. P. ♦ Chernyaev, S. V. ♦ Badun, Y. V.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ BISMUTH COMPOUNDS ♦ PHASE STUDIES ♦ SUPERCONDUCTIVITY ♦ STRONTIUM COMPOUNDS ♦ CALCIUM COMPOUNDS ♦ CUPRATES ♦ LEAD COMPOUNDS ♦ STOICHIOMETRY ♦ STABILITY ♦ THERMAL GRAVIMETRIC ANALYSIS ♦ DILATOMETRY ♦ ELECTRIC CONDUCTIVITY ♦ TEMPERATURE DEPENDENCE ♦ TEMPERATURE RANGE 0400-1000 K ♦ TEMPERATURE RANGE 1000-4000 K ♦ CRITICAL TEMPERATURE
Abstract Phase stability of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} (2212) and Bi{sub 1.8}Pb{sub 0.4}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub 10+{delta}} (2223) was studied by means of thermogravimetry, dilatometry, high-temperature resistivity, and the powder X-ray methods in the temperature range 700-1000{degrees} and at P{sub O2} = 1-10{sup -4.3} atm. The existence of a high-temperature (peritectic melting) boundary of phase stability was found. The temperatures of low-temperature phase decomposition were determined in air and under an oxygen atmosphere. The change in oxygen content was determined for the 2212 phase in the temperature range 700-860{degrees}C and at P{sub O2} = 0.21-10{sup -3.7} atm by iodometric analysis of quenched samples. It was found that in the single-phase region, the change in oxygen nonstoichiometry had an insignificant influence on T{sub c}. It was also shown that the slow cooling of samples led to a significant decrease in T{sub c} and transport j{sub c} due to partial phase decomposition.
ISSN 00224596
Educational Use Research
Learning Resource Type Article
Publisher Date 1995-10-01
Publisher Place United States
Journal Journal of Solid State Chemistry
Volume Number 119
Issue Number 1


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