Refinement of the Congruently Melting Composition of Nonstoichiometric Fluorite Crystals Ca1−xYxF2+x (x = 0.01–0.14)

The concentration series of nonstoichiometric crystals Ca1–xYxF2+x (x = 0.01–0.14) was obtained from a melt by directional crystallization to refine the composition of the temperature maximum on the melting curves. A precision (±9 × 10−5 Å) determination of lattice parameters of theCa1–xYxF2+x crystals with the structure of fluorite (sp. gr. Fm-3m) was performed, and a linear equation of their concentration dependence was calculated: a(x) = 5.46385(5) + 0.1999(4) x. The distribution of yttrium along the crystals Ca1–xYxF2+x, the content of which is determined by the precision lattice parameters, is studied. The congruently melting composition x = 0.105(5) of the Ca1–xYxF2+x phase is refined by the method of directional crystallization.

Bi32Cd3P10O76: a new congruently melting nonlinear optical crystal with a large SHG response and a wide transparent region

Large size single crystal Bi32Cd3P10O76 with a large SHG response (4 × KDP) and a wide transmission range covering 0.36–4.9 μm.

Ba5CdGa6Se15, a congruently-melting infrared nonlinear optical material with strong SHG response

Substitution of Cd for Ga leads to partial ordering and opens a band gap in Ba5CdGa6Se15, built of corner-sharing tetrahedra.

The synthesis, structure and properties of a new lithium-rich manganese(ii) phosphate Li5CsMn(P2O7)2: a congruently melting compound with a ‘lithium hamburger’ structure

A new layered lithium manganese diphosphate, possessing a high Li ion conductivity, has been proposed.