Synthesis and characterization of reduced ternary alkali metal molybdenum oxides

Technical Report · Sun Nov 01 04:00:00 EST 1987

OSTI ID:6416900

Aleandri, L E

A series of novel layered reduced Na and Li Mo-oxides is reported. The two-dimensional framework is quite unique among the structure types previously observed for reduced molybdenum oxides. Synthetic exploration of oxides related to Na/sub 2/Mo/sub 3/O/sub 6/ led to the isolation of a series of monoclinic layered Na-Mo-oxides, Na/sub 0.41/MoO/sub 2/, Na/sub 0.51/MoO/sub 2/, and Na/sub 0.66/MoO/sub 2/. The basic framework of these compounds consists of oxide layers alternating with sheets of Na and Mo atoms. Within the Mo layers, the metal atoms shift from ideal octahedral sites toward neighboring Mo atoms to form extended chains of fused rhomboidal clusters. The stacking of layers toward cubic close packing, ABCABC, was realized in the analogous Li-Mo-oxide system. A material with ccp oxygen layers, LiMoO/sub 2/, was isolated as the product from the high temperature reaction between Li/sub 2/MoO/sub 4/ and Mo metal. The results of the extended Hueckel calculations suggest that as the Mo bonding states are emptied, via oxidation by delithiation, the Mo sheet should rearrange to form Mo ribbons or some other type of clustering favored by the lower electron to Mo ratio. Synthetic efforts in the heavier alkali metal ternary system, K-Mo-oxide, have led to a novel compound containing Mo octahedral clusters. 70 refs., 22 figs., 37 tabs.

• Research Organization: Ames Lab., IA (USA)
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 6416900
• Report Number(s): IS-T-1330; ON: DE89007617
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BARIUM COMPOUNDS
BARIUM OXIDES
BOND LENGTHS
CHALCOGENIDES
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DIFFRACTION
DIMENSIONS
HEXAGONAL LATTICES
HOLLANDITE
LATTICE PARAMETERS
LENGTH
LITHIUM COMPOUNDS
MINERALS
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
MONOCLINIC LATTICES
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
POTASSIUM COMPOUNDS
REFRACTORY METAL COMPOUNDS
SCATTERING
SODIUM COMPOUNDS
SYNTHESIS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION