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The compounds CaTez05, SrTezOs, and CdT&05 were obtained as mica-like plates by slowly cooling their melts. Dielectric properties were similar to those of mica. Optical and infrared spectra showed appreciable transmittance from 0.33 to 7 pm with a cutoff at 10 pm. The compounds have refractive indices greater than 2. X-ray diffraction studies showed that only the calcium and cadmium compounds are isomorphous; tentative structures, accounting for the marked cleavage, are proposed for these materials on the basis of the geometric distribution of X-ray scattering.

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