Phase stability, oxygen nonstoichiometry, and superconductivity properties of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} and Bi{sub 1.8}Pb{sub 0.4}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub 10+{delta}}

Journal Article · Sun Oct 01 04:00:00 EDT 1995 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/0022-4596(95)80017-J· OSTI ID:237559

Mozhaev, A P; Chernyaev, S V; Badun, Y V ^[1]

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1. Moscow State Univ. (Russian Federation); and others

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.

• OSTI ID: 237559
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 1 Vol. 119; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BISMUTH COMPOUNDS
CALCIUM COMPOUNDS
CRITICAL TEMPERATURE
CUPRATES
DILATOMETRY
ELECTRIC CONDUCTIVITY
LEAD COMPOUNDS
PHASE STUDIES
STABILITY
STOICHIOMETRY
STRONTIUM COMPOUNDS
SUPERCONDUCTIVITY
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
THERMAL GRAVIMETRIC ANALYSIS