Infrared spectra of calcium hydride fluoride CaF_2−xH_x

Abstract

The existence of solid solutions of composition CaFZ-,H, (0 < x 2 1.24) is recently established, crystallizing in CaF2-type cubic symmetry. There is a statistical substitution of fluoride ions b y hydride ions in the CaF2 unit cell. The infrared spectroscopy gives informations on these compounds b y the behaviour of the Hions localized vibration and that of the fundamental TO mode when x varies.Une etude structurale par diffraction des rayons X e t par diffraction des neutrons a recemment mis en evidence l'existence de solutions solides CaF2-,H, (0 < z 5 1,34). Elles cristallisent dans la symBtrie cubique type fluorine. La spectroscopie infrarouge apporte des informations sin ces composes par le comportement de la vibration 1ocalisBe des ions He t par celui du mode fondamental de CaF, lorsque x varie.

Electrical behaviour of hydridofluorides of potassium–calcium KCaH3−xFx with x=1, 1.5, 2, 2.5

“…X-ray and neutron diffraction studies indicate a structure in which there is a statistical substitution of fluoride ions by hydride ions on the 8c sites of the CaF 2 unit cell. The infrared spectroscopy [17] gives information on these compounds by the behaviour of the H − ions localized vibration and the fundamental TO mode when x varies.…”