Abstract
Five iron containing germanium andalusites have been synthesized from homogeneous mixtures of Al 2 O 3 , GeO 2 and Fe 2 O 3 powders. The andalusite-type germanate Fe x Al 8- x Ge 4 O 20 is formed in the composition range 2.6 ≤ x ≤ 5.6, corresponding to Fe 2 O 3 weight fractions from 23.9 to 45.5%, respectively. The phases crystallize in the orthorhombic space group Pnnm with lattice constants a ranging from 8.0223(1) Å to 8.1490(2) Å, b from 8.1546(1) Å to 8.2654(2) Å, and c from 5.7620(1) Å to 5.8606(1) Å, with Z = 1. Rietveld analyses based on X-ray powder diffraction data showed, that the iron atoms are distributed statistically over the octahedrally coordinated M1 site and the five-coordinated M2 position. Microprobe and structure analyses give evidence for the occurrence of partial vacancies in cation and oxygen sites in all samples.
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