Abstract
High-pressure Raman experiments were performed on Sm2Mo4O15 system up to
7.9 GPa. We show that this system exhibits an irreversible structural
amorphization at 5.0 GPa. In contrast to any other molybdates and
tungstates experiencing pressure-induced amorphization, this structural
change in Sm2Mo4O15 has strongly first order character. This amorphous
phase can be originated from the hindrance of a crystalline structural
phase transition from the P (1) over bar to P2/m structure.
Additionally, the assignment of Raman modes of the ambient pressure
phase of Sm2Mo4O15 was proposed based on lattice dynamics calculations.
(C) 2016 Elsevier B.V. All rights reserved.
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