Oxygen nonstoichiometry of LnMnO3-δ (Ln=La, Pr, Nd, Sm and Y)
- 1. Toyohashi Univ. of Technology (Japan). Dept. of Materials Science
Description
The oxygen nonstoichiometry of LnMnO3-δ (Ln=La, Pr, Nd, Sm, Eu, Gd, Dy, Ho, Er, Yb and Y), which is in equilibrium with its decomposition products of Ln2O3 and MnO at the phase boundary, was determined at 1273 K. Temperature dependence of the oxygen defect δ was determined for LnMnO3-δ, with Ln=La, Pr, Nd, Sm and Y in the temperature range from 1073 to 1373 K. The dependence of concentration of oxygen defect for LnMnO3-δ at Ln=Nd and Sm on the oxygen partial pressure at 1273 K was well explained by the simple cluster model. From the temperature dependence of the equilibrium constant for the formation of oxygen defect, the standard enthalpy and entropy changes of defect formation were estimated for LnMnO3-δ with Ln=La, Pr, Nd, Sm and Y. (orig.)
Additional details
Publishing Information
- Journal Title
- Journal of Alloys and Compounds
- Journal Volume
- 252
- Journal Issue
- 1-2
- Journal Page Range
- p. 67-70.
- ISSN
- 0925-8388
- CODEN
- JALCEU
INIS
- Country of Publication
- Netherlands
- Country of Input or Organization
- Switzerland
- INIS RN
- 28060981
- Subject category
- S36: MATERIALS SCIENCE; S36: MATERIALS SCIENCE;
- Descriptors DEI
- CLUSTER MODEL; CRYSTAL DEFECTS; ENTHALPY; ENTROPY; MANGANESE OXIDES; OXYGEN; RARE EARTH COMPOUNDS; STOICHIOMETRY
- Descriptors DEC
- CHALCOGENIDES; CRYSTAL STRUCTURE; ELEMENTS; MANGANESE COMPOUNDS; MATHEMATICAL MODELS; NONMETALS; NUCLEAR MODELS; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENT COMPOUNDS