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Charge disproportionation in La1-xCaxFeO3–δ (x 5 0.4 and 0.5) investigated by mechanical spectroscopy.
- Source :
-
Journal of Applied Physics . 2014, Vol. 115 Issue 12, p123516-1-123516-5. 5p. 3 Graphs. - Publication Year :
- 2014
-
Abstract
- The nature of charge disproportionation in orthorhombic lanthanum orthoferrites La1-xCaxFeO3-δ (x=0.4 and 0.5) has been investigated by kilohertz mechanical spectroscopy. Contrast to rhombohedral La1-xSrxFeO3-δ (x=0.5), no elastic softening was observed in La1-xCaxFeO3-δ above charge disproportionation. This different behavior of elastic modulus in La1-xCaxFeO3-δ and La1-xSrxFeO3-δ unveils the implicit orbital effect. Below charge disproportionation, an internal friction peak around 140K was observed in La1-xCaxFeO3-δ, which is similar to that in La1-xSrxFeO3-δ. This peak is ascribed to an elastic manifestation of charge freezing and can be used as an indirect indication of CD in doped LaFeO3. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00218979
- Volume :
- 115
- Issue :
- 12
- Database :
- Academic Search Index
- Journal :
- Journal of Applied Physics
- Publication Type :
- Academic Journal
- Accession number :
- 95394708
- Full Text :
- https://doi.org/10.1063/1.4869662