Structure and properties of Y/sub 5/Mo/sub 2/O/sub 12/ and Gd/sub 5/Mo/sub 2/O/sub 12/: mixed valence oxides with structurally equivalent molybdenum atoms
Journal Article
·
· J. Solid State Chem.; (United States)
Crystals of Ln/sub 5/Mo/sub 2/O/sub 12/ (Ln = Y, Gd) were grown by electrochemical reduction of alkali-molybdate/rare-earth oxide melts at 1075-1100/sup 0/C. A single crystal of Y/sub 5/Mo/sub 2/O/sub 12/, used for structure determination, was found to be monoclinic with a = 12.2376(7) A, b = 5.7177(8) A, c = 7.4835(5) A, ..beta.. = 108.034(5)/sup 0/, and Z = 2. Although the structure was refined in space group C2/m, the true space group appears to be P2/sub 1//m. In Y/sub 5/Mo/sub 2/O/sub 12/, rutile-like sheets of edge-shared MoO/sub 6/ chains linked by YO/sub 6/ octahedra are interconnected with YO/sub 7/ monocapped trigonal prisms. The Mo atoms in the chains have alternating distances of 2.496 and 3.221 A and in that respect are similar to MoO/sub 2/. However, in contrast to metallic MoO/sub 2/ both the Y and Gd compounds are n-type semiconductors with room temperature resistivities of the order of 10/sup 3/ ohm-cm. Magnetic susceptibility measurements confirm the presence of one unpaired electron per Mo/sub 2/ unit. The semiconducting behavior can be explained in terms of an unfavorable bridging oxygen coordination which prevents electron delocalization through metal-oxygen pi bonding as in MoO/sub 2/. 29 references, 5 figures, 4 tables.
- Research Organization:
- E.I. du Pont de Nemours and Co., Wilmington, DE
- OSTI ID:
- 5985943
- Journal Information:
- J. Solid State Chem.; (United States), Journal Name: J. Solid State Chem.; (United States) Vol. 60:3; ISSN JSSCB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
BOND ANGLE
BOND LENGTHS
CHALCOGENIDES
COHERENT SCATTERING
COMPLEXES
CRYSTAL GROWTH
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALLOGRAPHY
CRYSTALS
DATA
DIFFRACTION
DIMENSIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EXPERIMENTAL DATA
GADOLINIUM COMPLEXES
INFORMATION
LATTICE PARAMETERS
LENGTH
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
MONOCLINIC LATTICES
MONOCRYSTALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPLEXES
REFRACTORY METAL COMPOUNDS
SCATTERING
SPACE GROUPS
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENT COMPOUNDS
VERY HIGH TEMPERATURE
X-RAY DIFFRACTION
YTTRIUM COMPLEXES
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
BOND ANGLE
BOND LENGTHS
CHALCOGENIDES
COHERENT SCATTERING
COMPLEXES
CRYSTAL GROWTH
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALLOGRAPHY
CRYSTALS
DATA
DIFFRACTION
DIMENSIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EXPERIMENTAL DATA
GADOLINIUM COMPLEXES
INFORMATION
LATTICE PARAMETERS
LENGTH
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
MONOCLINIC LATTICES
MONOCRYSTALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPLEXES
REFRACTORY METAL COMPOUNDS
SCATTERING
SPACE GROUPS
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENT COMPOUNDS
VERY HIGH TEMPERATURE
X-RAY DIFFRACTION
YTTRIUM COMPLEXES