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Thermogravimetric investigation of the relation between oxygen stoichiometry, temperature and oxygen partial pressure in Nd1-xCaxMnO3+δ perovskites (x≈0.5)

MPS-Authors
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Merkle,  R.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Brabers,  J. H. V. J.
Scientific Facility Thin Film Technology (Gennady Logvenov), Max Planck Institute for Solid State Research, Max Planck Society;

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Habermeier,  H.-U.
Scientific Facility Thin Film Technology (Gennady Logvenov), Max Planck Institute for Solid State Research, Max Planck Society;
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Maier,  J.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Merkle, R., Brabers, J. H. V. J., Habermeier, H.-U., & Maier, J. (2003). Thermogravimetric investigation of the relation between oxygen stoichiometry, temperature and oxygen partial pressure in Nd1-xCaxMnO3+δ perovskites (x≈0.5). Journal of Physics and Chemistry of Solids, 64(5), 785-791.


Cite as: https://hdl.handle.net/21.11116/0000-000E-E9E5-9
Abstract
The temperature and O-2 partial pressure dependence of the
oxygen stoichiometry (3+delta) in Nd0.52Ca0.48MnO3+delta has
been investigated by means of thermogravimetry (TG). The data
have been successfully interpreted in terms of a defect-
chemical model distinguishing between regimes of oxygen
deficiency and oxygen excess. In the regime of oxygen
deficiency we find DeltaH(0)=278 kJ/mol, DeltaS(0)=119 J/mol K
as typical values for the formation of oxygen vacancies. In the
oxygen-excess regime delta is related to the formation of
cation vacancies, and only an empirical relation between
temperature and pO(2) for delta=0 can be given. The defect-
chemical data set can be used as a tool to prepare Nd1-
xCaMnO3+delta perovskites with well-defined oxygen
stoichiometry. (C) 2003 Published by Elsevier Science Ltd.