In situ high-pressure synchrotron X-ray diffraction study of the structural stability in NdVO{sub 4} and LaVO{sub 4}
- CELLS-ALBA Synchrotron Light Facility, Cerdanyola, 08290 Barcelona (Spain)
- Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085 (India)
- Luminiscent Materials Laboratory, DB and INSTM, Università di Verona, Strada Le Grazie 15, I-37134 Verona (Italy)
Highlights: • NdVO{sub 4} and LaVO{sub 4} were studied under high pressure using synchrotron powder XRD. • Both compounds exhibit first-order phase transitions. • In NdVO{sub 4} the transition involves a symmetry breaking and in LaVO{sub 4} is isomorphic. • The crystal structures of the high-pressure phases are assigned. • Axial and bulk compressibilities are determined. - Abstract: Room-temperature angle-dispersive X-ray diffraction measurements on zircon-type NdVO{sub 4} and monazite-type LaVO{sub 4} were performed in a diamond-anvil cell up to 12 GPa. In NdVO{sub 4}, we found evidence for a non-reversible pressure-induced structural phase transition from zircon to a monazite-type structure at 6.5 GPa. Monazite-type LaVO{sub 4} also exhibits a phase transition but at 8.6 GPa. In this case the transition is reversible and isomorphic. In both compounds the pressure induced transitions involve a large volume collapse. Finally, the equations of state and axial compressibilities for the low-pressure phases are also determined.
- OSTI ID:
- 22345218
- Journal Information:
- Materials Research Bulletin, Vol. 50; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
Similar Records
In situ high-pressure synchrotron x-ray diffraction study of CeVO[subscript 4] and TbVO[subscript 4] up to 50 GPa
High-pressure x-ray diffraction study on the structure and phase transitions of the defect-stannite ZnGa[subscript 2]Se[subscript 4] and defect-chalcopyrite CdGa[subscript 2]S[subscript 4]