Structural investigation of temperature-induced phase transitions in HfV2O7
Laboratoire Matériaux Multiphasés Interfaces, Université de Toulon et du Var, B.P. 132, 83957 La Garde
2 Laboratoire de Cristallographie, CNRS, B.P. 166, 38042 Grenoble Cedex 09, France
Accepted: 22 February 2000
Published online: 15 April 2000
HfV2O7 powders were prepared by means of thermal decomposition of a mixture of vanadyl and hafnyl oxalates in air at 973 K. The room temperature structure and its evolution with temperature was investigated using both electron microscopy (TEM and HREM) and powder diffraction (X-ray and neutron) techniques combined with DSC measurements. HfV2O7 exhibits two temperature-induced phase transitions between room temperature and 480 K. Over the highest transition (370 K), HfV2O7 crystallizes in a cubic system with a cell parameter of 8.75 Å and space group. A negative thermal expansion is observed in this high temperature phase and can be correlated to anisotropic oxygen atom displacements. On the other hand, the room temperature structure of HfV2O7 is also described in a cubic symmetry, but the existence of superstructure reflections leads to a cell parameter three times larger than for the high temperature structure (~ 26.25 Å). Moreover, HREM calculations have shown that the atomic positions, usually used to describe the superstructures of the ZrV2O7 compounds, cannot be used in the case of HfV2O7 at room temperature.
PACS: 61.16.Bg – Transmission, reflection and scanning electron microscopy (including EBIC) / 61.12.-q – Neutron diffraction and scattering / 65.70.+y – Thermal expansion and density changes; thermomechanical effects
© EDP Sciences, 2000