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Thermodynamic investigation of Rb2FeTi(PO4)3 phosphate of langbeinite structure

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Abstract

The temperature dependence of molar heat capacity for Rb2FeTi(PO4)3 phosphate was investigated between T = 6 and 650 K by precision adiabatic vacuum and differential scanning calorimetry in this research. 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 \( C_{{{\text{p}},{\text{m}}}}^{\text{o}} ,\;\left[ {H_{\text{m}}^{\text{o}} (T) - H_{\text{m}}^{\text{o}} (6)} \right],\;\left[ {S_{\text{m}}^{\text{o}} (T) - S_{\text{m}}^{\text{o}} (6)} \right],\;\varPhi_{\text{m}}^{\text{o}} \) of Rb2FeTi(PO4)3 within the range T → 6–650 K were calculated. The low-temperature heat capacity analysis, performed based on the Debye theory and multifractal model, leads to the conclusion of 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 (Project No. 15-03-00716) based on equipment of Common Use Center «New materials and resource-recovery technologies» (Agreement N 14.594.21.0005).

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

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

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

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Pet’kov, V.I., Asabina, E.A., Markin, A.V. et al. Thermodynamic investigation of Rb2FeTi(PO4)3 phosphate of langbeinite structure. J Therm Anal Calorim 124, 1535–1544 (2016). https://doi.org/10.1007/s10973-016-5319-8

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