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Calorimetric study of high-pressure polymorphs of Li2WO4 and Li2MoO4

descriptionPublicationkeyboard_double_arrow_right Article 01 Nov 1986 English Publisher:Elsevier BVJournal:Journal of Solid State Chemistry, volume 65, pages 241-250 (issn: 0022-4596,

Authors: Eiji Takayama-Muromachi; Shinobu Yamaoka; Alexandra Navrotsky;

doi: 10.1016/0022-4596(86)90059-9

Calorimetric study of high-pressure polymorphs of Li2WO4 and Li2MoO4

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Abstract

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/.

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College of New Jersey
United States

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