Magnetic Germanates Isostructural with Garnet

Abstract

In order to study the magnetic interaction between the eightfold and the combined six- and fourfold sites in the garnet structure, several germanate garnets have been synthesized. If no magnetic cation is present in the fourfold site no spontaneous magnetization has been found in the temperature range 90° to 500°K. A partial substitution of the nonmagnetic cation in the fourfold site by magnetic cations, however, leads to a spontaneous magnetization.