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- Title
A combined study of the equation of state of monazite-type lanthanum orthovanadate using in situ high-pressure diffraction and ab initio calculations.
- Authors
Ermakova, Olga; López-Solano, Javier; Minikayev, Roman; Carlson, Stefan; Kamińska, Agata; Głowacki, Michał; Berkowski, Marek; Mujica, Andrés; Muñoz, Alfonso; Paszkowicz, Wojciech
- Abstract
Lanthanum orthovanadate (LaVO4) is the only stable monazite-type rare-earth orthovanadate. In the present paper the equation of state of LaVO4 is studied using in situ high-pressure powder diffraction at room temperature, and ab initio calculations within the framework of the density functional theory. The parameters of a second-order Birch-Murnaghan equation of state, i.e. those fitted to the experimental and theoretical data, are found to be in perfect agreement - in particular, the bulk moduli are almost identical, with values of 106 (1) and 105.8 (5) GPa, respectively. In agreement with recent reported experimental data, the compression is shown to be anisotropic. Its nature is comparable to that of some other monazite-type compounds. The softest compression direction is determined.
- Subjects
MONAZITE; LANTHANUM; TEMPERATURE; DENSITY functional theory; MURNAGHAN equation; ANISOTROPY
- Publication
Acta Crystallographica Section B: Structural Science, Crystal Engineering & Materials, 2014, Vol 70, Issue 3, p533
- ISSN
2052-5192
- Publication type
Article
- DOI
10.1107/S2052520614010816