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Heat capacity measurements on Ba1.5Fe2(PO4)3 and its thermodynamic functions

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Abstract

The temperature dependence of molar heat capacity of Ba1.5Fe2(PO4)3 phosphate was investigated between T = 6 and 670 K with precision adiabatic vacuum and differential scanning calorimetry. The anomaly was observed in the heat capacity curve, and its character was explained by magnetic disorder–order phase transition at T below 6 K. The standard thermodynamic functions \(C_{{{\text{p}} \cdot {\text{m}}}}^{{\text o}}\), \([H_{\text{m}}^{{\text o}} \left( T \right) - H_{\text{m}}^{{\text o}} \left( 6 \right)]\), \(\left[ {S_{\text{m}}^{{\text o}} \left( T \right) - S_{\text{m}}^{{\text o}} \left( 6 \right)} \right]\) and \(\Phi _{\text{m}}^{{\text o}}\) of Ba1.5Fe2(PO4)3 were calculated within the range T → 6–670 K. The low-temperature heat capacity analysis, based on the Debye theory and multifractal model, reveals framework structural topology of the studied phosphate.

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Acknowledgements

The present work was performed at the Lobachevsky State University of Nizhni Novgorod with the financial support of the Russian Foundation for Basic Research and the Goverment of Nizhny Novgorod Region of the Russian Federation (Project No. 18-43-520004) and the Ministry of Education and Science of the Russian Federation (Project No. 4.8337.2017/BCh).

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  1. Lobachevsky State University of Nizhni Novgorod, Prospekt Gagarina 23, Nizhni Novgorod, Russian Federation, 603950

    V. I. Pet’kov, A. V. Markin, A. A. Alekseev & N. N. Smirnova

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  1. V. I. Pet’kov
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  2. A. V. Markin
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  3. A. A. Alekseev
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  4. N. N. Smirnova
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Correspondence to V. I. Pet’kov.

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Pet’kov, V.I., Markin, A.V., Alekseev, A.A. et al. Heat capacity measurements on Ba1.5Fe2(PO4)3 and its thermodynamic functions. J Therm Anal Calorim 132, 353–364 (2018). https://doi.org/10.1007/s10973-017-6925-9

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  • DOI: https://doi.org/10.1007/s10973-017-6925-9

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