Phase transitions and ionic mobility in hydrogen zirconium phosphates with the NASICON structure, H{sub 1{+-}}{sub X}Zr{sub 2-X}M{sub X}(PO{sub 4}){sub 3}.H{sub 2}O, M = Nb, Y
- California Institute of Technology, 1200 E. California Boulevard, Pasadena, CA 91125 (United States)
- Institute of Solid State Chemistry of Russian Academy of Sciences, Pervomayskaya Str. 91, Ekaterinburg 620041 (Russian Federation)
- Kurnakov Institute of General and Inorganic Chemistry of Russian Academy of Sciences, Leninsky pr. 31, Moscow 119991 (Russian Federation)
Phase transitions and the mobility of proton-containing groups in hydrogen zirconium phosphate HZr{sub 2}(PO{sub 4}){sub 3}.nH{sub 2}O with the NASICON structure were studied by X-ray powder diffraction, {sup 1}H, {sup 31}P NMR, IR spectroscopy and TG analysis. Heating HZr{sub 2}(PO{sub 4}){sub 3}.H{sub 2}O above 420 K results in dehydration and in a rhombohedral-triclinic phase transition. Continued heating to about 490 K results in the thermal activation of cation disordering and phase transition of HZr{sub 2}(PO{sub 4}){sub 3} from triclinic to rhombohedral phase. Parameter 'a' of HZr{sub 2}(PO{sub 4}){sub 3} lattice decreases during the heating. It is shown that oxonium ions in HZr{sub 2}(PO{sub 4}){sub 3}.H{sub 2}O are characterized by high rotation and translation mobility. Rotation mobility of oxonium ions can be increased by the substitution of zirconium by yttrium or niobium.
- OSTI ID:
- 21068198
- Journal Information:
- Materials Research Bulletin, Vol. 43, Issue 2; Other Information: DOI: 10.1016/j.materresbull.2007.03.003; PII: S0025-5408(07)00109-2; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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