High Pressure–Temperature Study of MgF2, CaF2, and BaF2 by Raman Spectroscopy: Phase Transitions and Vibrational Properties of AF2 Difluorides
Xinyue Zhang,
Luo Li,
Yingxin Yu
et al.
Abstract:The phase transition of AF2 difluorides strongly
depends
on pressure, temperature, and cationic radius. Here, we have investigated
the phase transition of three difluorides, including MgF2, CaF2, and BaF2, at simultaneously high pressures
and temperatures using Raman spectroscopy and X-ray diffraction in
externally heated diamond anvil cells up to 55 GPa at 300–700
K. Rutile-type difluoride MgF2 with a small cationic radius
undergoes a transition to the CaCl2-type phase at 9.9(1)
GPa and 300 K, to the HP-PdF2-… Show more
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