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High-pressure X-ray diffraction study on α-PbF2

2003; Elsevier BV; Volume: 64; Issue: 6 Linguagem: Inglês

10.1016/s0022-3697(02)00437-7

1879-2553

Lars Ehm, K. Knorr, Fritz Mädler, Henning Voigtländer, E. Busetto, Alberto Cassetta, Andrea Lausi, B. Winkler,

X-ray Diffraction in Crystallography

The high-pressure behaviour of α-PbF2 was investigated by angular-dispersive synchrotron X-ray powder diffraction up to 6.55(8) GPa. The fit of a third-order Birch–Murnaghan equation-of-state gave the volume at zero pressure V0=194.14(4) Å3 and the bulk modulus b0=47.0(6) GPa with the pressure derivative b′=7.9(4). The continuous-symmetry-measure approach has been used for the quantification of the distortion of the coordination polyhedron in α-PbF2 revealing an increasing distortion with pressure.