Abstract
The two rare earth germanates in the title represent new and different structure types, with Gd being in 7 and 8 coordination, and Dy being 6- and 7-coordinated to oxygen. Ge is tetrahedral in either case. Ge 2GeO 5 is monoclinic, space group P2 1 c with a = 9.323(2), b = 7.090(1), c = 6.838(1) A ̊ , β = 105.40(1)°. The final R value is 0.047. Dy 2GeO 5 is also monoclinic, space group I2/ a with a = 10.483(1), b = 6.829(1), c = 12.885(1) A ̊ , β = 101.72(1)° and a final R of 0.027. The structure of these two compounds as well as some UV and X-ray excited luminescent properties are described.
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