Crystal structure and electrical properties of K/sub 3/Bi/sub 2/(VO/sub 4/)/sub 3/, a new potassium bismuth vanadate
K/sub 3/Bi/sub 2/(VO/sub 4/)/sub 3/ crystallizes in the space group C2/c, a = 13.957(4), b = 13.858(4), c = 7.095(2) A, ..beta.. = 112.80(3)/sup 0/, Z = 4. The crystal structure was determined from single-crystal intensity data obtained by means of an automated four-circle diffractometer and refined to the conventional values R = 0.050 and R/sub w/ = 0.059 for 1498 observed reflections. The structure is characterized by a three-dimensional network of Bi/sub 2/O/sub 10/ units and VO/sub 4/ tetrahedra. A Bi/sub 2/O/sub 10/ unit is formed by two BiO/sub 6/ octahedra sharing an edge. K/sup +/ ions occupy three different crystallographic sites. One of them has a high thermal vibration which could reflect ionic mobility. The ionic conductivity highly increases at 790 K. DSC measurements show a reversible transition at this temperature. One K atom, and only one, can be substituted by one Na atom to give NaK/sub 2/Bi/sub 2/(VO/sub 4/)/sub 3/; this substitution improves the conductivity.
- Research Organization:
- CNRS, Villeneuve d'Ascq, France
- OSTI ID:
- 5524120
- Journal Information:
- J. Solid State Chem.; (United States), Vol. 71:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BISMUTH COMPOUNDS
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
POTASSIUM COMPOUNDS
VANADATES
EXPERIMENTAL DATA
LATTICE PARAMETERS
MONOCLINIC LATTICES
POWDERS
SPACE GROUPS
X-RAY DIFFRACTION
ALKALI METAL COMPOUNDS
COHERENT SCATTERING
CRYSTAL LATTICES
DATA
DIFFRACTION
ELECTRICAL PROPERTIES
INFORMATION
NUMERICAL DATA
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SCATTERING
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies
360204 - Ceramics
Cermets
& Refractories- Physical Properties