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Figure 7
Valences of metal atoms as a function of the parameter t calculated from the metal- to O-atom distances by the bond-valence method. The horizontal lines give the valences for the basic structure. Parameters were R0Nb-O = 1.911 Å, R0Sr-O = 2.118 Å and b = 0.37 Å. The standard uncertainties due to those of the distances affect the second digit behind the decimal point. (a) Nb sites Nb1 and Nb2; (b) Sr sites Sr1 and Sr2. The valences for the two Nb sites in the basic structure coincide.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 58| Part 6| November 2002| Pages 970-976
doi:10.1107/S010876810201741X
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