TY - JOUR
T1 - Calorimetric study of high-pressure polymorphs of Li2WO4 and Li2MoO4
AU - Takayama-Muromachi, Eiji
AU - Navrotsky, Alexandra
AU - Yamaoka, Shinobu
N1 - Funding Information:
One of the authors (E.T.) thanks Mrs. Kobayashi and Mr. Yajima of NIRIM for the chemical analysis and Mr. C. Skiba and Dr. D. Ziegler of ASU for useful suggestionso n the calorimetric measurement.T his work was supportedb y NSF Grant DMR 8106027.
PY - 1986/11/15
Y1 - 1986/11/15
N2 - 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.
AB - 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.
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U2 - 10.1016/0022-4596(86)90059-9
DO - 10.1016/0022-4596(86)90059-9
M3 - Article
AN - SCOPUS:0022811139
SN - 0022-4596
VL - 65
SP - 241
EP - 250
JO - Journal of Solid State Chemistry
JF - Journal of Solid State Chemistry
IS - 2
ER -