91st Annual Meeting of the American Ceramic Society
Phase relations at 850 and 870 C, melting transitions in air, oxygen, and helium were studied for Bi(2.1)Sr(1.9) CuO{sub 6} and for the Bi{sub 2}Sr{sub 2}Ca(n{minus}1) Cu(n)O(2n+4) for n = 1, 2, 3, 4, 5, and infinity (CaCuO{sub 2}). Up to 870 C, the n = 2 composition resides in the compatibility tetrahedron bounded by Bi(2+x)(Sr,Ca)(3{minus}y) Cu{sub 2}O{sub 8}, (Sr,Ca)14 Cu{sub 24}O{sub 41}, Ca{sub 2}CuO{sub 3}, and a Bi-Sr-Ca-O phase. The n is greater than or equal to 3 compositions reside in the compatibility tetrahedron Bi(2+x)(Sr,Ca)(3{minus}y) Cu{sub 2}O{sub 8} {minus} (Sr,Ca)14 Cu{sub 24}O{sub 41} {minus} Ca{sub 2}CuO{sub 3} {minus} CuO up to 850 C. However, Bi(2+x)Sr(4{minus}y) Cu{sub 3}O{sub 10} forms for n is greater than or equal to 3 after extended heating at 870 C. Bi(2+x)Sr(2{minus}y) CuO{sub 6} and Bi(2+x)(Sr,Ca)(3{minus}y) Cu{sub 2}O{sub 8} melt in air at 914 C and 895 C respectively. During melting, all of the compositions studied lose 1 to 2 percent by weight of oxygen from the reduction of copper. Bi(2+x)Sr(2{minus}y) CuO{sub 6}, Bi(2+n)(Sr,Ca)(3{minus}y) Cu{sub 2}O{sub 8}, and Bi(2+x)(Sr,Ca)(4{minus}y) Cu{sub 3}O{sub 10} exhibit crystallographic alignment in a magnetic field, with the c-axes orienting parallel to the field.
- Research Organization:
- National Aeronautics and Space Administration, Cleveland, OH (United States). Lewis Research Center
- OSTI ID:
- 5406311
- Report Number(s):
- N-91-21910; NASA-TM--103749; E--6000; NAS--1.15:103749; CONF-890421--
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360602* -- Other Materials-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COMPATIBILITY
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
FLUIDS
GASES
HEATING
HELIUM
HIGH-TC SUPERCONDUCTORS
MAGNETIC FIELDS
MELTING
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
RARE GASES
STABILITY
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTIVITY
SUPERCONDUCTORS
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS