The crystal structure of quantum paraelectric EuTiO3 has been reported to remain cubic down to low temperature. Using synchrotron radiation powder diffraction in the 60 ≤ T ≤ 300 K we found a new cubic Pm-3m to tetragonal I4/mcm structural phase transition. Pair distribution function (PDF) analysis of data collected at T = 100 K, 150 K, 240 K revealed important details about the nature of the transition. In particular at T = 240 K the short range structure is not consistent with the mean crystallographic cubic model and is better described by the low temperature tetragonal model.
Structural phase transition in EuTiO3 probed by Pair distribution function analysis / M. Allieta, C. Mazzoli, M. Scavini, V. Scagnoli. ((Intervento presentato al 39. convegno Workshop on Analysis of Diffraction Data in Real Space tenutosi a Grenoble nel 2011.
Structural phase transition in EuTiO3 probed by Pair distribution function analysis
M. AllietaPrimo
;M. ScaviniPenultimo
;
2011
Abstract
The crystal structure of quantum paraelectric EuTiO3 has been reported to remain cubic down to low temperature. Using synchrotron radiation powder diffraction in the 60 ≤ T ≤ 300 K we found a new cubic Pm-3m to tetragonal I4/mcm structural phase transition. Pair distribution function (PDF) analysis of data collected at T = 100 K, 150 K, 240 K revealed important details about the nature of the transition. In particular at T = 240 K the short range structure is not consistent with the mean crystallographic cubic model and is better described by the low temperature tetragonal model.
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