Single crystals of undoped Li 2 WO 4 and Li 2 W 1-0.0125 Mo 0.0125 O 4 : formation enthalpies, heat capacity in the temperature range 320-997 K.

Autor: Matskevich NI; Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences, 3 Lavrentiev Prospect, 630090 Novosibirsk, Russian Federation., Shlegel VN; Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences, 3 Lavrentiev Prospect, 630090 Novosibirsk, Russian Federation., Semerikova AN; Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences, 3 Lavrentiev Prospect, 630090 Novosibirsk, Russian Federation., Samoshkin DA; Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences, 3 Lavrentiev Prospect, 630090 Novosibirsk, Russian Federation.; Kutateladze Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences, 1 Lavrentiev Prospect, 630090 Novosibirsk, Russian Federation., Grigorieva VD; Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences, 3 Lavrentiev Prospect, 630090 Novosibirsk, Russian Federation., Stankus SV; Kutateladze Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences, 1 Lavrentiev Prospect, 630090 Novosibirsk, Russian Federation., Kuznetsov VA; Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences, 3 Lavrentiev Prospect, 630090 Novosibirsk, Russian Federation., Ponomareva SA; Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences, 3 Lavrentiev Prospect, 630090 Novosibirsk, Russian Federation., Zaitsev VP; Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences, 3 Lavrentiev Prospect, 630090 Novosibirsk, Russian Federation.; Siberian State University of Water Transport, 33 Shchetinkina Avenue, 630099, Russian Federation., Novikov AY; Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences, 3 Lavrentiev Prospect, 630090 Novosibirsk, Russian Federation.
Jazyk: angličtina
Zdroj: Dalton transactions (Cambridge, England : 2003) [Dalton Trans] 2021 Sep 14; Vol. 50 (35), pp. 12130-12136. Date of Electronic Publication: 2021 Sep 14.
DOI: 10.1039/d1dt01620b
Abstrakt: The Li 2 WO 4 single crystal was first grown by applying the Czochralski technique with weight control and low-temperature-gradients. A single crystal of Li 2 WO 4 is one of the perspective materials for researching rare events. The heat capacity for a Li 2 W 1-0.0125 Mo 0.0125 O 4 single crystal has been determined by DSC calorimetry in the temperature range 320-997 K for the first time. No anomalies in the heat capacity associated with phase transitions were found. The standard formation enthalpy for the Li 2 WO 4 single crystal was studied using reaction calorimetry. It has been shown that the relation of standard formation enthalpies for Li 2 W 1- x Mo x O 4 ( x = 0.15-0) with function (1- x )W + x Mo are close to linear, which allows one to predict the thermodynamic properties for single crystals with isotopes Li 2 W 186 1-0.0125 Mo 100 0.0125 O 4 and Li 2 W 186 O 4 . It was shown that single crystals with isotopes are more thermodynamically stable than without isotopes.
Databáze: MEDLINE
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