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The heat capacity of LaPO4 and PrPO4 nanowhiskers

Size effect and measurement features

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Abstract

The heat capacity of monazite-type LaPO4 and PrPO4 nanocrystalline whiskers, with a diameter of 30 to 45 nm and length 1–1.5 μm, was measured by adiabatic and relaxation calorimetry. The essential difference in the heat capacity of nanowhiskers and bulk particle substances was observed only at a temperature above 100 K. The research revealed significant restrictions in the use of an adiabatic method (that uses helium as a heat-transfer gas) for measurements of nanoscale substances’ heat capacity, due to the considerable sorption of helium.

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Acknowledgements

The equipment of the Joint Research Centre of IGIC RAS and Thermodynamic Centre of Precise Calorimetric Research of Lobachevsky National Research State University of Nizhny Novgorod was used to carry out this investigation. The authors thank Dr A.E. Baranchikov for the SEM study of RE orthophosphates.

Funding

This study was carried out as part of the State Assignment on fundamental research of the Kurnakov Institute of General and Inorganic Chemistry and Research Programme of the Presidium of the Russian Academy of Sciences «Scientific foundations of new functional materials production» and was funded by Grant Number 0088-2014-0003.

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Authors and Affiliations

  1. Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, Leninsky Prospect 31, Moscow, Russia, 119991

    K. I. Bryukhanova, G. E. Nikiforova, A. V. Tyurin, M. A. Ryumin & K. S. Gavrichev

  2. Lobachevsky National Research State University, Gagarin Avenue 23, Nizhny Novgorod, Russia, 603950

    N. N. Smirnova

Authors
  1. K. I. Bryukhanova
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  2. G. E. Nikiforova
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  3. A. V. Tyurin
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  4. M. A. Ryumin
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  5. K. S. Gavrichev
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  6. N. N. Smirnova
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Correspondence to K. I. Bryukhanova.

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Bryukhanova, K.I., Nikiforova, G.E., Tyurin, A.V. et al. The heat capacity of LaPO4 and PrPO4 nanowhiskers. J Therm Anal Calorim 132, 337–342 (2018). https://doi.org/10.1007/s10973-017-6593-9

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  • DOI: https://doi.org/10.1007/s10973-017-6593-9

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