Heats of transition among the Li2WO4 polymorphs, Li2WO4I (phenacite-type structure), Li2WO4II, Li2 WO4III, and Li2WO4IV, and that between Li2MoO4 (phenacite) and Li2MoO4(spinel) were measured by transposed temperature drop calorimetry. The heats of fusion of Li2WO4I and Li2MoO4(ph) were also obtained. Using these data, the phase boundaries among the polymorphs of Li2WO4 and of Li2MoO4 were calculated. The calculated phase diagrams were compared with those reported previously. They agree well for Li2WO4 but show significant discrepancies, perhaps related to problems in attaining equilibrium at lower temperature, for Li2MoO4.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry