Struktura elektronowa granatów typu $R_3Ga_5O_{12}$

Abstract

The garnets $R_3Ga_5O_{12}$ type are of interest as a laser crystals and substrate materials for magnetic epitaxial in magnetic bubble devices. For present investigation $R_3Ga_5O_{12}$ crystals were grown from platinum crucibles by the Czochralski method. The crystals were being grown in the flow of dried oxygen at the excess pressure of about 1 atm. The basic components were gallium dioxide, germanium dioxide, and calcium carbonate (all of high purity). The best single crystals were obtained by growing on seeds oriented in [001] direction. We present experimental results of electronic structure investigations of $R_3Ga_5O_{12}$ by X-ray emission spectroscopy and X-ray photoelectron spectroscopy methods. The X-ray spectral data allow qualitative description of the structure of the valence band of gallium garnet.