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High-pressure Raman scattering on Fe 2 (MoO 4 ) 3 microcrystals obtained by a hydrothermal method

2016; Elsevier BV; Volume: 87; Linguagem: Inglês

10.1016/j.vibspec.2016.09.011

1873-3697

João Victor Barbosa Moura, G.S. Pinheiro, Paulo Freire, J. Mendes Filho, Gilberto D. Saraiva, Bartolomeu C. Viana, C. Luz‐Lima,

Luminescence Properties of Advanced Materials

This study reports on the effect of high hydrostatic pressure on the vibrational spectra of Fe2(MoO4)3 microcrystals using Raman scattering in combination with a membrane diamond-anvil cell. The ferric molybdate was obtained by the conventional hydrothermal method, and the structural and morphological properties of the sample were characterized using additionally X-ray diffraction, scanning electron microscopy, as well as energy dispersive spectroscopy. The X-ray diffraction measurements have shown that the crystals have a monoclinic structure. At pressures higher than 4.8 GPa, the disappearance of external modes was observed, suggesting that pressure has induced a breakdown in the translational symmetry of the crystal system. The high-pressure amorphous phase is reversible and attributed to an incomplete crystal-amorphous transformation.