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The phase stability of La0.5Sr0.5CoO3 − δ

✍ Scribed by F. Morin; G. Trudel; Y. Denos

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
798 KB
Volume
96
Category
Article
ISSN
0167-2738

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✦ Synopsis

In preparing ABO, compounds with A = La and Sr and B = Co or Mn, it has been found that strontium-substituted lanthanum cobaltite, La, _,Sr.rCoO,_,, has much less tolerance for any variation in the A/B ratio than its manganite counterpart. This is specifically demonstrated for La,, sSrcl ,CoO,_, where distinct phases readily appear on either sides of the A/B ratio for any small departure of this ratio from unity. These secondary phases are clearly evidenced by scanning electron microscopy and X-ray diffraction. The same observations have been extended to various degrees of strontium substitution between 0.4 5x I 0.6. Additional data in regard to the main phase stability as a function of the oxygen partial pressure at temperatures up to 1425°C have also been gathered. The (La, _,Sr, ),CoO,-phase formed in this latter case is very similar to that due to the unbalance in the A/B ratio.

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