Abstract
The standard enthalpy of formation of sodium dimolybdate was determined by dissolution calorimetry based on the measured enthalpies of dissolution of Na2CO3, MoO3, and Na2Mo2O7 in a 0.2 M NaOH solution and the literature data: ΔfH0(Na2Mo2O7, 298.15 K) = −2245.3 ± 6.3 kJ/mol. The lattice enthalpy was calculated using the Born–Haber cycle: –54 730 kJ/mol. The wavelength of luminescence radiation decreased from 650 to 540 nm on passing from sodium molybdate to sodium tungstate, and the lattice enthalpy decreased from –54 730 kJ/mol (Na2Mo2O7) to –49 030 kJ/mol (Na2W2O7). The temperature dependence of the heat capacity of sodium dimolybdate was determined in the temperature range 320–785 K. There are no phase transitions in this range.
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ACKNOWLEDGMENTS
N.I. Matskevich, A.N. Semerikova, V.D. Grigor’eva, D.V. Kochelakov, S.A. Luk’yanova, V.N. Shlegel’, and E.N. Tkachev are grateful to the Ministry of Science and Higher Education of the Russian Federation (project 121031700314-5) for granting the use of a calorimeter, growth units, and diffractometer.
Funding
This work was supported by the Russian Science Foundation (project 19-19-00095-P).
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This article is part of the Materials of the XV Symposium with International Participation “Thermodynamics and Materials Science,” Novosibirsk, July 3–7, 2023.
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Matskevich, N.I., Semerikova, A.N., Grigor’eva, V.D. et al. Thermodynamic Characteristics of the Sodium Dimolybdate Single Crystal: Enthalpy and Heat Capacity. Russ. J. Phys. Chem. (2024). https://doi.org/10.1134/S0036024424010151
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DOI: https://doi.org/10.1134/S0036024424010151