Low-temperature heat capacity of some alkali metal tungstates

Journal Article · Fri Nov 14 23:00:00 EST 1980 · J. Solid State Chem.; (United States)

DOI:https://doi.org/10.1016/0022-4596(80)90490-9· OSTI ID:6693409

Pan, P H; Shanks, H R; Bevolo, A J; Danielson, G C

Heat capacity measurements have been made on the two triclinic tungstates, Li/sub 0/ /sub 2/WO/sub 3/ and Na/sub 0/ /sub 33/WO/sub 3/ from 1 to 60/sup 0/K. In addition to the normal Debye term the data show a large contribution which can be fit to a single Einstein mode associated with the oscillation of the alkali ions in the holes formed by the corner bonding of six WO/sub 6/ octahedra. The Einstein characteristic temperatures obtained are 71 +- 2 and 78 +- 2/sup 0/K for Li/sub 0/ /sub 2/WO/sub 3/ and Na/sub 0/ /sub 33/WO/sub 3/, respectively. The results are compared with those reported earlier for the hexagonal tungsten bronzes.

• Research Organization: Ames Lab., IA
• OSTI ID: 6693409
• Journal Information: J. Solid State Chem.; (United States), Journal Name: J. Solid State Chem.; (United States) Vol. 35:2; ISSN JSSCB
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKALI METAL COMPOUNDS
COMPARATIVE EVALUATIONS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DEBYE TEMPERATURE
EINSTEIN COEFFICIENTS
HEXAGONAL LATTICES
LITHIUM COMPOUNDS
LITHIUM TUNGSTATES
PHYSICAL PROPERTIES
SODIUM COMPOUNDS
SODIUM TUNGSTATES
SPECIFIC HEAT
THERMODYNAMIC PROPERTIES
TRICLINIC LATTICES
TUNGSTATES
ULTRALOW TEMPERATURE
VERY LOW TEMPERATURE