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Author Yuan, C. C. ♦ Kao, H. C. I. ♦ Wang, C. M.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ LANTHANUM OXIDES ♦ SINTERING ♦ CRYSTAL STRUCTURE ♦ STRONTIUM OXIDES ♦ BARIUM OXIDES ♦ COPPER OXIDES ♦ POWDERS ♦ CALCINATION ♦ ANNEALING ♦ X-RAY DIFFRACTION ♦ CALORIMETRY ♦ THERMAL GRAVIMETRIC ANALYSIS ♦ DIFFERENTIAL THERMAL ANALYSIS ♦ TRANSITION TEMPERATURE ♦ TETRAGONAL LATTICES ♦ PEROVSKITE ♦ SOLUBILITY ♦ IMPURITIES ♦ DENSITY
Abstract A series of single phase La{sub 1.5{minus}x/2}Sr{sub x}Ba{sub 1.5{minus}x/2}Cu{sub 3}O{sub y} (0 {le} x {le} 0.80) compounds with a tetragonal triple-perovskite unit-cell have been prepared by solid-state reaction. With increasing x, unit-cell {alpha} axis, volume, density, and peritectic transition temperature (T{sub p}) of La{sub 1.5{minus}x/2}Sr{sub x}Ba{sub 1.5{minus}x/2}Cu{sub 3}O{sub y} decrease monotonically. The peak position of T{sub p} measured in the 25 mL/min flowing O{sub 2} atmosphere and 10 C/min heating rate decreases from 1,105 to 1,080 C as x increases from 0 to 0.80. The oxygen atom loss in the peritectic transition is 0.38 {+-} 0.05 O-atom{center_dot}mole{sup {minus}1}.
ISSN 00255408
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-11-01
Publisher Place United States
Journal Materials Research Bulletin
Volume Number 31
Issue Number 11


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