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Low-Temperature Heat Capacities of Terbium Molybdate Phosphates M I2 Tb(MoO4)(PO4) (MI = Na or K)

  • Physical Methods of Investigation
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Abstract

The heat capacities of Na2Tb(MoO4)(PO4) and K2Tb(MoO4)(PO4) were measured by adiabatic calorimetry at low temperatures (6.34–333.74 and 7.20–341.17 K, respectively). Smoothed thermal-capacities values were used to calculate the entropy, enthalpy increments, and reduced Gibbs energy. The respective values at 298.15 K are as follows: for Na2Tb(MoO4)(PO4), C 0p (298.15 K) = 240.1 ± 0.2 J/(K mol), 0 (298.15 K) = 307.4 ± 0.4 J/(K mol), H 0(298.15 K) − H 0(0) = 44.95 ± 0.03 kJ/mol, and Φ0(298.15 K) = 156.6 ± 0.5 J/(K mol); and for K2Tb(MoO4)(PO4): C 0p (298.15 K) = 245.1 ± 0.1 J/(K mol), S 0(298.15 K) = 322.9 ± 0.1 J/(K mol), H 0(298.15 K) − H 0(0) = 46.58 ± 0.02 kJ/mol, and Φ0(298.15 K) = 166.6 ± 0.2 J/(K mol). The noncooperative magnetic component of the heat capacity was estimated.

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Authors and Affiliations

  1. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119991, Russia

    K. S. Gavrichev, M. A. Ryumin, A. V. Tyurin & V. P. Danilov

  2. Institute of Chemistry, Nizhni Novgorod State University, Nizhni, Novgorod, Russia

    N. N. Smirnova

  3. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, ul. Kosygina 19, Moscow, 119992, Russia

    V. M. Gurevich

  4. Chemistry Faculty, Moscow State University, Vorob’evy gory, Moscow, 119992, Russia

    F. M. Spiridonov & L. N. Komissarova

Authors
  1. K. S. Gavrichev
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  2. N. N. Smirnova
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  3. M. A. Ryumin
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  4. V. M. Gurevich
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  5. A. V. Tyurin
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  6. F. M. Spiridonov
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  7. L. N. Komissarova
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  8. V. P. Danilov
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Gavrichev, K.S., Smirnova, N.N., Ryumin, M.A. et al. Low-Temperature Heat Capacities of Terbium Molybdate Phosphates M I2 Tb(MoO4)(PO4) (MI = Na or K). Russ. J. Inorg. Chem. 53, 268–274 (2008). https://doi.org/10.1134/S0036023608020186

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  • DOI: https://doi.org/10.1134/S0036023608020186

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