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Phase Equilibrium Diagrams of the Binary Systems LaMnO3-SrMnO3 and LaMnO3-CaMnO3

Published online by Cambridge University Press:  10 February 2011

Peter Majewski ,
Lars Epple ,
Heike Schluckwerder  and
Fritz Aldinger
Peter Majewski
Affiliation:
Max-Planck-Institut für Metaliforschung, Pulvermetallurgisches Laboratorium, Heisenbergstraße 5, 70569 Stuttgart, Germany
Lars Epple
Affiliation:
Max-Planck-Institut für Metaliforschung, Pulvermetallurgisches Laboratorium, Heisenbergstraße 5, 70569 Stuttgart, Germany
Heike Schluckwerder
Affiliation:
Max-Planck-Institut für Metaliforschung, Pulvermetallurgisches Laboratorium, Heisenbergstraße 5, 70569 Stuttgart, Germany
Fritz Aldinger
Affiliation:
Max-Planck-Institut für Metaliforschung, Pulvermetallurgisches Laboratorium, Heisenbergstraße 5, 70569 Stuttgart, Germany
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Abstract

The quasi binary systems LaMnO3 – SrMnO3 and LaMnO3 – CaMnO3 have been studied. Both systems show a miscibility gap below about 1400°C in air. This phenomenon causes the decomposition of single phase (La,Sr)MnO3−x and (La,Ca)MnO3−x solid solution with intermediate La:Sr or La:Ca ratios into La rich SrMnO3−x or CaMnO3−x and Sr or Ca rich LaMnO3−x at lower temperatures. At 1400°C a structure transformation of (La,Sr)MnO3 from orthorhombic to rombohedral has not been observed and the structure of La0.7Sr0.3MnO3 has been determined to be orthorhombic with a = 0.54927 ± 0.0009 nm, b = 0.54582 ± 0.0009 nm, and c = 0.76772 ± 0.0034 nm.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 602: Symposium JJ – Magnetoresistive Oxides & Related Materials , 1999 , 327
Copyright
Copyright © Materials Research Society 2000

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