Abstract
Germanium-containing compounds isostructural with naturally occurring silicate garnets have been synthesized dry and at 1 atm of steam by solid state reaction. The general formula for these compounds is A 3B 2Ge 3O 12 in which A is divalent Cd, Ca or Mn, and B is trivalent Fe, Al, Cr, Sc or Ga. Of these possible combinations only Mn 3Sc 2Ge 3O 12 and Ca 3Ga 2Ge 3O 12 could not be prepared in this investigation. X-ray fluorescence analysis indicates that most of the compounds contain less than the stoichiometric amount of Ge. Reaction studies from 800°C to the melting points revealed several phases which could not be identified. Several of the compounds yielded glasses upon quenching of their melts. The determination of cation distribution in Ca 3Al 2Ge 3O 12 based on intensity data from X-ray diffraction was inconclusive.
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