Pressure evolution of two polymorphs of Tb2(MoO4)3

DOI: 10.1080/08957959.2014.895342

Authors: Candelaria Guzman-Afonso (Universidad de La Laguna) , Juan Javier Lopez Solano (Universidad de La Laguna) , Maria Cristina Gonzalez Silgo (Universidad de La Laguna) , Sergio Leon Luis (Universidad de La Laguna) , Emilio Matesanz (Universidad Complutense de Madrid) , Andres Mujica Fernaud (Universidad de La Laguna)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: High Pressure Research , PAGES 1-7

State: Published (Approved)
Published: March 2014
Diamond Proposal Number(s): 7758 , 8615

Abstract: We have studied the high pressure behavior of the α and β′-phases of Tb 2(MoO 4)3 using a combination of powder X-ray diffraction and ab initio calculations. The α-Tb 2(MoO 4)3 phase did not undergo any structural phase transition in the pressure range from 0 up to the maximum experimental pressure of 21 GPa. We observed line broadening of the diffraction patterns at pressures above 7 GPa, which may be due to non-hydrostatic conditions. The complete amorphization of the sample was not reached in the pressure range studied, as expected from previous Raman studies. The behavior under pressure of the β′-Tb 2(MoO 4)3 phase is similar to that of other rare-earths trimolybdates with the same structure at room temperature. A phase transition was observed at 2 GPa. The new phase, which can be identified as the δ-phase, has never been completely characterized by diffraction studies. A tentative indexation has been performed and good refined cell parameters were obtained. We detect indications of amorphization of the δ-Tb 2(MoO 4)3 phase at 5 GPa.

Journal Keywords: X-Ray Diffraction; Ab Initio Calculations; Rare-Earth Molybdates; Structural Transitions

Subject Areas: Materials, Physics, Chemistry


Instruments: I15-Extreme Conditions

Added On: 17/03/2014 15:56

Discipline Tags:

Physics Physical Chemistry Chemistry Materials Science

Technical Tags:

Diffraction X-ray Powder Diffraction