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Origin of the negative thermal expansion in perovskite-type PrGaO3
|Anatoliy Senyshyn 2, Leonid Vasylechko 2, Dmytro I. Savytskii 2, Ulrich Bismayer 1, Marek Berkowski 3|
1. University of Hamburg, Mineralogisch-Pertographisches Institut, Hamburg, Germany
Perovskite-type rare-earth gallates attracted much attention because of their interesting physical qualities. Most important properties of RGaO3 compounds are used in substrate materials, either for high-temperature superconductors (HTSC), for doped manganese perovskite LnMnO3 films with colossal magnetoresistance (CMR) and for GaN films. Recently it was proposed to use rare-earth gallates as superionic conductors. Among such rare-earth perovskite-type gallates, PrGaO3 is outstanding. Our recent studies of the PrGaO3 structure using high-resolution powder diffraction techniques and synchrotron radiation revealed negative thermal expansion in the temperature range 12 - 80 K. Nevertheless, no negative expansion could be seen in isostructural LaGaO3, CeGaO3 and NdGaO3.
Presentation: poster at E-MRS Fall Meeting 2004, Symposium H, by Anatoliy Senyshyn
See On-line Journal of E-MRS Fall Meeting 2004
Submitted: 2004-05-04 12:26 Revised: 2009-06-08 12:55