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Synthesis, Characterization, and X-Ray Powder Structure of K2ZrGe2O7

✍ Scribed by Pilar Pertierra; Miguel A. Salvado; Santiago Garcia-Granda; Camina Trabajo; J.R. Garcia; Anatoly I. Bortun; Abraham Clearfield

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
373 KB
Volume
148
Category
Article
ISSN
0022-4596

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✦ Synopsis

A potassium zirconium pyrogermanate, K 2 ZrGe 2 O 7 , was synthesized hydrothermally at 1803C from a mixture of zirconium propionate, GeO 2 , and KOH. The crystal structure was solved from in-house X-ray powder data by direct methods and Fourier analysis. Re5nement of the structure was e4ected by the Rietveld full-pattern technique. The compound is monoclinic, space group C 2 /c, a ‫؍‬ 9.9619(2) A s , b ‫؍‬ 5.5578(1) A s , c ‫؍‬ 12.9555(3) A s , ‫؍‬ 105.169(1)3, Z ‫؍‬ 4. The structure is remarkably like that of -zirconium phosphate. Zr(HPO 4 ) 2 ' H 2 O, except that the layers are crosslinked by the pyrogermanate group to form a threedimensional lattice. Exchange of the K ؉ ions is minimal as they are strongly held within the con5nes of narrow tunnels. The relationship of this newly synthesized pyrogermanate to a sodium zirconium pyrogermanate prepared hydrothermally at 5003C and Na 3 H(GeO 4 ) 2 is discussed.

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