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A new method is described to express the Madelung parameter of a structure with a non-cubic Bravais lattice as a function of a lattice parameter by means of a power series expansion. The method is derived for the case of a cubic lattice which is tetragonally distorted. The generalization to other...
A full sphere of data extending to (sin /) = 1.2 A-1 and containing 1595 reflections was measured with small, natural, single crystals of graphite and Mo K radiation. With the structure assumed to be in space group P63/mmc, the valence-charge density of the two independent C atoms was represented...
NaF gives rise to very weak odd-index reflexions in X-ray diffraction. These reflexions have been studied to determine the best models for electron distribution in the NaF crystal. Data were obtained from a single crystal at room temperature for Ag K, Mo K, Cu K and Co K radiations. Least-squares...
The temperature dependence of all elastic constants of cubic NaCN, measured by ultrasonic methods at ca 15 MHz from the transition point at 10.55 to 200DegreesC, exhibits a similar anomalous thermoelastic behaviour to cubic KCN. Within a wide temperature range all elastic wave velocities increase...