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24 European Crystallographic Meeting, ECM24, Marrakech, 2007 Page s185 Acta Cryst. (2007). A63, s185 Several samples of KNN have been produced, with x ranging from 0.25 to 0.85. Both neutron and X-ray scattering studies were performed at ISIS and Oxford. Rietveld refinement was used to obtain the information about lattice parameters, atom positions and anisotropic displacement parameters as a function of temperature and compositions. At present, the phase transition occurring approximately at x = 0.48 is being studied. In the region 0.48<x<1, orthorhombic phase M is labeled without any tilting of oxygen octahedra. After the phase transition has occurred, phase L appears (space group Pm). The extra peaks indicate that phase L has the aba oxygen octahedral tilt system and off-centre cations movements approximately along [110]. High temperature measurements were performed by X-ray diffraction. Lattice parameters were extracted over temperature. The transitions of orthorhombic, tetragonal, and cubic phases were observed in the region x>0.48 at high temperatures.

Anisotropic thermal expansion and compressibility in BaMgF4and BaZnF4

Anisotropic thermal expansion and compressibility in BaMgF₄and BaZnF₄