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Structural Investigations on Scandium Substituted Nasicons. Order Disorder Effects

Published online by Cambridge University Press:  21 February 2011

A. Clearfield ,
P.G. Hinson ,
P.R. Rudolf  and
P.J. Squattrito
A. Clearfield
Affiliation:
Department of Chemistry, Texas A&M University, College Station, TX 77843
P.G. Hinson
Affiliation:
Department of Chemistry, Texas A&M University, College Station, TX 77843
P.R. Rudolf
Affiliation:
Department of Chemistry, Texas A&M University, College Station, TX 77843
P.J. Squattrito
Affiliation:
Department of Chemistry, Texas A&M University, College Station, TX 77843
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Abstract

Neutron diffraction data were used to refine the structures of three scandium substituted NASICONS: Na2 ZrSc(PO4)3, R3c Na2.5 Zr1.8 Sc0.2 Si1.7 O12 R3c and Na2.7. Zr1.0 Sc0.2Si1.5 P1.5O12, C2/c. The phosphate (compound 1) exhibited oxygen disorder. The second compound exhibited a similar type of oxygen disorder but also an interstitial Na+ position. The oxygen disorder in compound 2 apparently results from the position of the interstitial Nae whereas it is suggested that the Sc site in Na2 ZrSC(PO4)3 is slightly removed from that of the Zr position, requiring a shift of phosphate groups. In contrast the monoclinic phase does not exhibit oxygen disorder and all the sodium ions reside within the cavities.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 135: Symposium M – Solid State Ionics I , 1988 , 251
Copyright
Copyright © Materials Research Society 1989

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