Pressure-induced structural transformations in In_2-x Y_x (MoO₄ )₃ systems

Abstract

In this work, we report results of high‐pressure Raman experiments (P < 8 GPa) on In2‐xYxMo3O12 for x = 0.0 and 0.5. A crystalline to crystalline structural phase transition and pressure‐induced amorphization (PIA) have been identified. The structural phase transition takes place at 1.5 and 1.0 GPa for In2(MoO4)3 and In1.5Y0.5(MoO4)3, respectively, resulting in the change of structure from monoclinic P21/a to a more denser structure. The PIA started at 5 and 3.4 GPa for In2Mo3O12 and In1.5Y0.5Mo3O12, respectively. The amorphization process takes place in two stages in the case of In1.5Y0.5Mo3O12 phase, while for In2Mo3O12, it is not complete until the pressure is as high as 7 GPa. Our results also suggest that with increase of ionic size of the A3+ ions, the octahedral distortion increases and consequently larger local structural disorder is introduced in the A2(MoO4)3 system, where A is a trivalent ion (In, Y3+, Sc3+, Fe3+, etc.). Copyright © 2015 John Wiley & Sons, Ltd.

Recent advances in linear and non‐linear Raman spectroscopy. Part XI

“…Mendonca et al studied pressure‐induced structural transformations in In 2‐x Y x (MoO 4 ) 3 systems. They found that the amorphization process takes place in two stages in the case of the In 1.5 Y 0.5 Mo 3 O 12 phase, while for In 2 Mo 3 O 12 , it is not complete until the pressure is as high as 7 GPa . Montagnac and co‐workers investigated structural changes in perylene from UV Raman spectroscopy up to 1 GPa.…”