High-temperature ferroic phase transitions and paraelectric cubic phase in multiferroic Bi0.951dFe0.9Zr0.1O3

Wei Jie (1, 2, 3) , R. Haumont (2, 3) , R. Jarrier (2, 3) , P. Berthet (2) , B. Dkhil (3)

1 Electronic Materials Research Laboratory
2 ICMMO - Institut de Chimie Moléculaire et des Matériaux d'Orsay
3 SPMS - Laboratoire Structures, Propriétés et Modélisation des solides

The temperature-dependent phase transitions of Bi0.95þdFe0.9Zr0.1O3 have been studied using hightemperature x-ray powder diffraction together with differential scanning calorimetry measurements. The results show that Bi0.95þdFe0.9Zr0.1O3 undergoes two phase transitions at 815 C and 905 C before decomposition at 920 C. It appears that Zr-doping seems to stabilize the high temperature phases in such compound. Both the sharp contraction in the unit-cell volume and enthalpy thermal hysteresis demonstrate that the ferroelectric phase transition (a/!b) at 815 C is of first order nature. In contrast, the highest b/!c phase transition at 905 C appears to be a second-order-like one. The analysis of the diffraction pattern in addition to Rietveld refinement strongly suggests a cubic symmetry for c-phase.

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Wei Jie, R. Haumont, R. Jarrier, P. Berthet, B. Dkhil. High-temperature ferroic phase transitions and paraelectric cubic phase in multiferroic Bi0.951dFe0.9Zr0.1O3. Journal of Applied Physics, 2012, 111, pp.114106. ⟨10.1063/1.4729484⟩. ⟨hal-00708573⟩