Powder diffraction studies of pressure-induced instabilities in orthorhombic LnGaO3

Autor: Leonid Vasylechko, Iain D. H. Oswald, J. M. Engel, Anatoliy Senyshyn, Marek Berkowski
Rok vydání: 2009
Předmět:
Zdroj: Zeitschrift für Kristallographie Supplements. 2009:341-346
ISSN: 0930-486X
DOI: 10.1524/zksu.2009.0050
Popis: Pressure evolution of LaGaO3, CeGaO3, PrGaO3, NdGaO3, La0.75Pr0.25GaO3 and La0.63Nd0.37GaO3 crystal structures was studied using powder diffraction with synchrotron radiation at ambient temperature in a broad pressure range. Structural instabilities corresponding to phase transformations have been observed in all studied compositions and it was found that P, of these transitions depends on the deformation of the perovskite structure. The effect of the pressure medium on the phase transition, bulk modulus and compressibilities of LaGaO3, CeGaO3, PrGaO3, NdGaO3, La0.75Pr0.25GaO3 and La0.63Nd0.37GaO3 has been discussed in brief.
Databáze: OpenAIRE