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

Journal Article · Tue Feb 05 04:00:00 EST 2008 · Materials Research Bulletin

DOI:https://doi.org/10.1016/j.materresbull.2007.03.003· OSTI ID:21068198

Kislitsyn, M N ^[1]; Ghuravlev, N A ^[2]; Yaroslavtsev, A B ^[3]

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1. California Institute of Technology, 1200 E. California Boulevard, Pasadena, CA 91125 (United States)
2. Institute of Solid State Chemistry of Russian Academy of Sciences, Pervomayskaya Str. 91, Ekaterinburg 620041 (Russian Federation)
3. 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, Journal Name: Materials Research Bulletin Journal Issue: 2 Vol. 43; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERAMICS
DEHYDRATION
HEATING
HYDROGEN COMPOUNDS
IMPEDANCE
INFRARED SPECTRA
MOBILITY
NIOBIUM COMPOUNDS
NUCLEAR MAGNETIC RESONANCE
OXONIUM IONS
PHASE TRANSFORMATIONS
SPECTROSCOPY
THERMAL GRAVIMETRIC ANALYSIS
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
ZIRCONIUM PHOSPHATES