Structures in the Oxygen-Deficient Fluorite-Related R n O 2 n -2 Homologous Series: Pr 12 O 22

Author: Zhang J.   von Dreele R.B.   Eyring L.  

Publisher: Academic Press

ISSN: 0022-4596

Source: Journal of Solid State Chemistry, Vol.122, Iss.1, 1996-02, pp. : 53-58

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Abstract

The crystal structure of Pr 12 O 22 was determined utilizing Rietveld analysis of powder neutron diffraction data ( P 2 1 / c , a = 6.6850(2) A, b = 11.6004(4) A, c = 12.8271(4) A, beta = 99.974(1)#°, V = 979.67(8) A 3 ; total variables 130, R p = 3.25%, w R p = 5.02%). This structure is different from the models previously proposed, and the basic structural element is the isolated oxygen vacancy, as observed in another more-oxidized member of the R n O 2 n -2 series, Tb 11 O 20 .