Phase stability of lanthanum orthovanadate at high-pressure
arXiv:1603.07095 · doi:10.1021/acs.jpcc.6b04782
Abstract
When monoclinic monazite-type LaVO4 (space group P21/n) is squeezed up to 12 GPa at room temperature, a phase transition to another monoclinic phase has been found. The structure of the high-pressure phase of LaVO4 is indexed with the same space group (P21/n), but with a larger unit-cell in which the number of atoms is doubled. The transition leads to an 8% increase in the density of LaVO4. The occurrence of such a transition has been determined by x-ray diffraction, Raman spectroscopy, and ab initio calculations. The combination of the three techniques allows us to also characterize accurately the pressure evolution of unit-cell parameters and the Raman (and IR)-active phonons of the low- and high-pressure phase. In particular, room-temperature equations of state have been determined. The changes driven by pressure in the crystal structure induce sharp modifications in the color of LaVO4 crystals, suggesting that behind the monoclinic-to-monoclinic transition there are important changes of the electronic properties of LaVO4.
arXiv comment39 pages, 6 tables, 7 figures
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- New Pressure-Induced Polymorphic Transitions of Anhydrous Magnesium Sulfate
- PrVO under High Pressure: Effects on Structural, Optical and Electrical Properties
- Structural phase transition and its consequences on optical behavior of LaVNbO