Structural study of the high-temperature phases of the hexagonal perovskite KNiCl3

Between room temperature and its melting point at 645 degrees C, KhTiCl(3) shows two structural phase transitions. The beta --&gt; alpha transition at 287 degrees C has a second-order character. The unit cell changes in size from a root 3 x a root 3 re to a</p

The magnetic structure in K+ beta-ferrite

The magnetic structures of stoichiometric, KFe11O17, and non-stoichiometric, K1.33Fe11O17, K+ beta-ferrite, have been studied with neutron powder diffraction at 10, 295 and 923 K. Parameters describing the crystal and magnetic structures were refined with</p

Structure of molten trivalent metal bromides studied by using neutron diffraction: The systems DyBr3, YBr3, HoBr3 and ErBr3

The structure of the salts MBr3, where M3+ denotes Dy3+, Y3+, Ho3+ or Er3+, was investigated by using neutron diffraction. On heating DyBr3, YBr3 and HoBr3, a phase transition from the FeCl3-type crystal structure to possibly the YCl3-type crystal structu</p

The crystal and magnetic structure of nonstoichiometric K+ beta-ferrite

The crystal and magnetic structure of K+ beta-ferrite, K1.33Fe12O17, has been studied with neutron powder diffraction (lambda = 1.47) at 10, 295 and 923 K. Parameters describing the crystal and magnetic structure were refined with the Rietveld method. A m</p

Size or polarisability effects? A comparative study of TlCu7S4 and TlCu7Se4

The room temperature structures of the tetragonal compounds TlCu7S4 and TlCu7Se4 have been reinvestigated on various fronts, by experiment and theoretical calculations. Neutron powder diffraction data have been analysed by Rietveld profile refinement and Reverse Monte Carlo modelling. Both approaches show substantial disorder on the copper site that corresponds to 25% vacancies in the common crystallographic description, and more so inthe thiocuprate than in the selenocuprate.</p