Thermal Behaviour of PrCo_{1-x}Fe_xO₃ Probed by X-ray Synchrotron Powder Diffraction and Impedance Spectroscopy Measurements

• Authors: O. Pekinchak , D. Sugak , S. Ubizskii , Yu. Suhak , H. Fritze , L. Vasylechko
• Languages of publication: EN

Abstracts

EN

Crystal structure and transport properties of the mixed praseodymium cobaltites-ferrites PrCo_{1-x}Fe_xO₃ 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 PrCo_{1-x}Fe_xO₃ 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 Co^{3+} 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 PrCo_{1-x}Fe_xO₃ at the elevated temperatures.

Keywords

EN

61.66.Fn; 61.05.cp; 65.40.De; 72.60.+g

Discipline

• 61.66.Fn: Inorganic compounds
• 61.05.cp: X-ray diffraction
• 65.40.De: Thermal expansion; thermomechanical effects
• 72.60.+g: Mixed conductivity and conductivity transitions

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2018
• Volume: 133
• Issue: 4
• Pages: 798-801

Dates

published

2018-04

Contributors

author

O. Pekinchak

• Lviv Polytechnic National University, Lviv, Ukraine

author

D. Sugak

• Lviv Polytechnic National University, Lviv, Ukraine

author

S. Ubizskii

• Lviv Polytechnic National University, Lviv, Ukraine

author

Yu. Suhak

• Institute of Energy Research and Physical Technologies, Clausthal University of Technology, Goslar, Germany

author

H. Fritze

• Institute of Energy Research and Physical Technologies, Clausthal University of Technology, Goslar, Germany

author

L. Vasylechko

• Lviv Polytechnic National University, Lviv, Ukraine

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Identifiers

DOI

10.12693/APhysPolA.131.798