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Athermochemical Investigation of the La-Sr-Cu-O System

Published online by Cambridge University Press:  28 February 2011

Joseph Bularzik ,
Alexandra Navrotsky ,
Bruce Scott ,
Joe Bringley  and
Steve Trail
Joseph Bularzik
Affiliation:
Dept. of Geological and Geophysical Sciences, Princeton University, Princeton, NJ 08544
Alexandra Navrotsky
Affiliation:
Dept. of Geological and Geophysical Sciences, Princeton University, Princeton, NJ 08544
Bruce Scott
Affiliation:
IBM Thomas J. Watson Research Center, Yorktown Heights, NY 10598
Joe Bringley
Affiliation:
IBM Thomas J. Watson Research Center, Yorktown Heights, NY 10598
Steve Trail
Affiliation:
IBM Thomas J. Watson Research Center, Yorktown Heights, NY 10598
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Abstract

The perovskite related La2‐xMxCuO4‐y oxides substituted with alkaline earth metals were one of the first classes of high temperature superconductors discovered. Determining the thermodynamic properties is important to understand the stability and superconducting mechanism of these structures. High temperature solution calorimetry, using a molten lead borate solvent, has been performed on La2CuO4 and the related Sr substituted oxides. Calorimetric measurements on CuO, La2O3 and SrCO3 yield heats of formation. A change in the trend of the heats of formation appears at Sr content 0.1, the reported orthorhombic to tetragonal transition, the onset of superconductivity and loss of oxygen.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 169: Symposium M – High Temperature Superconductors: Fundamental Properties and Novel Materials Processing , 1989 , 61
Copyright
Copyright © Materials Research Society 1990

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