The lattice dynamics of Ba 2 ZnTeO 6 double perovskite in three phases has been studied. Vibrational spectra and dynamic charges are calculated. In the rhomobohedral phase R3m, soft modes were found; after their condensation, C2/m was obtained, which agrees with experiment. An assessment made dependence enthalpy different on pressure; it showed that monoclinic is more favorable at 0 pressure, b...

Calcium aluminates (CA) are the most important hydraulically setting cements used for preparing refractory castables, because they develop high strength at very early ages after placements.  The anhydrous phases of this kind of cements are CA, CA2 and traces of C12A7 and alpha-alumina. The major hydraulic phase in all of the CA cements including ciment fondu...