LATTICE-CONSTANT-ADAPTABLE CRYSTALLOGRAPHICS .2. CZOCHRALSKI GROWTH FROM MULTICOMPONENT MELTS OF HOMOGENEOUS MIXED-GARNET CRYSTALS

Homogeneous mixed crystals of rare-earth garnets containing Ca2+, Mg2+, Zr4+, Hf4+ and Ge4+ as guest ions have been grown from multicomponent melts. Garnet compositions that grow with distribution coefficients keff(cat) of unity or nearly unity have been found. These crystals could be classified into mixed-crystal systems and groups. Crystal-structural parameters are used for the graphic representation of these mixed-garnet compositional series. The distribution coefficients of the cations are adjusted to unity by appropriate choice of the melt compositions. The lattice constants of the mixed garnets can be varied in the range from 1.240 up to 1.286 nm. Single crystals have been grown with dimensions between 18 and 100 mm in diameter and 50 and 120 mm in length. The crystal quality is comparable with that found in unsubstituted garnets. © 1990.