| Autor: |
PEKINCHAK, O., SUGAK, D. YU., UBIZSKII, S. B., SUHAK, YU., FRITZE, H., VASYLECHKO, L. |
| Předmět: |
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| Zdroj: |
Acta Physica Polonica: A; Apr2018, Vol. 133 Issue 4, p798-801, 4p |
| Abstrakt: |
Crystal structure and transport properties of the mixed praseodymium cobaltites-ferrites PrCo1-xFexO3 have been studied in the temperature range of 298-1173 K by a combination of in situ X-ray synchrotron powder diffraction and temperature dependent impedance spectroscopy measurements. In situ high temperature powder diffraction examination of PrCo1-xFexO3 series revealed considerable anomalies in the lattice expansion which are especially pronounced for the cobalt-rich specimens. These anomalies, which are reflected in a sigmoidal dependence of the unit cell dimensions and in the considerable increase of the thermal expansion coefficients, are obviously associated with transitions of Co3+ ions from low spin to the higher spin states and the coupled metal-insulator transitions, occurring in in rare earth cobaltites at the elevated temperatures. Indeed, the temperature-dependent impedance measurements clearly prove the change of conductivity type from dielectric to the metallic behaviour in the mixed cobaltite-ferrites PrCo1-xFexO3 at the elevated temperatures. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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