Mixed oxides of sodium, antimony (5+) and divalent metals (Ni, Co, Zn or Mg)
- South Federal University, 7 ul. Zorge, Rostov-na-Donu 344090 (Russian Federation)
A family of alpha-NaFeO{sub 2}-type oxides Na{sub x}M{sub (1+x)/3}Sb{sub (2-x)/3}O{sub 2} (M=Ni, Co, Zn, Mg; x{approx}0.8 or 0.9) has been prepared by solid state reactions and characterized by powder XRD. At x=1, ordering occurs with tripling the unit cells and formula units. The powder patterns for Na{sub 3}M{sub 2}SbO{sub 6} (M=Ni, Co) comply with both trigonal P3{sub 1}12 cell and monoclinic C2/m cell. The Ni compound exhibits also a series of extremely weak reflections (I<0.3%) that need doubling of the c axis, and the final cell is C2/c, a=5.3048(3), b=9.1879(4), c=10.8356(7), beta=99.390(5). These ambiguities are explained by stacking faults. The compounds absorb atmospheric moisture with c-axis expansion up to 29%. A delafossite-related superlattice Ag{sub 3}Co{sub 2}SbO{sub 6} has been prepared by ion exchange and refined: P3{sub 1}12, a=5.3842(2), c=18.6613(10). Ionic conductivity of the Na{sub 0.8}Ni{sub 0.6}Sb{sub 0.4}O{sub 2} ceramics, 0.4 S/m at 300 deg. C, is greater than reported previously, presumably owing to the grain orientation produced by hot pressing. - Graphical abstract: It is shown that the powder patterns for Na{sub 3}M{sub 2}SbO{sub 6} (M=Ni and Co) may be equally well described by a trigonal P3{sub 1}12 cell and a monoclinic C2/m cell. In addition, the Ni compound exhibits a series of extremely weak reflections (I<0.3%) that need doubling of the monoclinic c axis, and the final cell is C2/c.
- OSTI ID:
- 21372539
- Journal Information:
- Journal of Solid State Chemistry, Vol. 183, Issue 3; Other Information: DOI: 10.1016/j.jssc.2009.12.002; PII: S0022-4596(09)00565-9; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ANTIMONATES
ANTIMONY OXIDES
CERAMICS
COBALT COMPOUNDS
GRAIN ORIENTATION
HOT PRESSING
ION EXCHANGE
IONIC CONDUCTIVITY
MAGNESIUM COMPOUNDS
MONOCLINIC LATTICES
NICKEL COMPOUNDS
SODIUM OXIDES
SUPERLATTICES
TEMPERATURE RANGE 0400-1000 K
TRIGONAL LATTICES
X-RAY DIFFRACTION
ZINC COMPOUNDS
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ANTIMONY COMPOUNDS
CHALCOGENIDES
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FABRICATION
MATERIALS WORKING
MICROSTRUCTURE
ORIENTATION
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PRESSING
SCATTERING
SODIUM COMPOUNDS
TEMPERATURE RANGE
TRANSITION ELEMENT COMPOUNDS