Structural Study of Layered PbFCl-Type Compounds
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The pressure dependence of the longitudinal acoustic mode corresponding to the elastic constant C<SUB>33</SUB> of the matlockite layered ionic compounds BaFX (X= Cl, Br or I) has been studied by Brillouin spectroscopy in a diamond anvil cell. All the measurements have been performed up to 20 GPa. The difference of the elastic response between the BaFX compounds is attributed to the distortion of the X electron charge density of the highly polarizable anions. This phenomenon is related to the large static dipole at the X anion and involves an energy contribution U<SUB>pol</SUB> which seems to stabilize the layered structure.
- The Review of High Pressure Science and Technology
The Review of High Pressure Science and Technology 7, 266-268, 1998
The Japan Society of High Pressure Science and Technology