Calorimetric study of high-pressure polymorphs of Li/sub 2/WO/sub 4/ and Li/sub 2/MoO/sub 4/

Journal Article · Sat Nov 15 04:00:00 EST 1986 · J. Solid State Chem.; (United States)

DOI:https://doi.org/10.1016/0022-4596(86)90059-9· OSTI ID:7008194

Takayama-Muromachi, E; Navrotsky, A; Yamaoka, S

Heats of transition among the Li/sub 2/WO/sub 4/ polymorphs, Li/sub 2/WO/sub 4/I (phenacite-type structure), Li/sub 2/WO/sub 4/II, Li/sub 2/ WO/sub 4/III, and Li/sub 2/WO/sub 4/IV, and that between Li/sub 2/ MoO/sub 4/ (phenacite) and Li/sub 2/MoO/sub 4/(spinel) were measured by transposed temperature drop calorimetry. The heats of fusion of Li/sub 2/WO/sub 4/I and Li/sub 2/MoO/sub 4/(ph) were also obtained. Using these data, the phase boundaries among the polymorphs of Li/sub 2/WO/sub 4/ and of Li/sub 2/MoO/sub 4/ were calculated. The calculated phase diagrams were compared with those reported previously. They agree well for Li/sub 2/WO/sub 4/ but show significant discrepancies, perhaps related to problems in attaining equilibrium at lower temperature, for Li/sub 2/MoO/sub 4/.

• Research Organization: National Institute for Research in Inorganic Materials, Ibaraki, Japan
• OSTI ID: 7008194
• Journal Information: J. Solid State Chem.; (United States), Journal Name: J. Solid State Chem.; (United States) Vol. 65:2; ISSN JSSCB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALI METAL COMPOUNDS
DATA
ENTHALPY
EXPERIMENTAL DATA
FUSION HEAT
HIGH PRESSURE
HIGH TEMPERATURE
INFORMATION
LITHIUM COMPOUNDS
LITHIUM TUNGSTATES
MOLYBDATES
MOLYBDENUM COMPOUNDS
NUMERICAL DATA
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
REFRACTORY METAL COMPOUNDS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION HEAT
TUNGSTATES