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Thermophysical Properties of Lanthanum and Samarium Zirconate—Hafnates

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Abstract

The synthesis and identification of lanthanum and samarium zirconate–hafnates of the pyrochlore structure type have been reported. The heat capacity of the samples in the temperature range 310–1380 K was measured by the differential scanning calorimetry method. The temperature dependences of the cubic lattice parameters were determined, and the thermal expansion coefficients were evaluated in the range 298–1273 K using high-temperature X-ray powder diffraction. The thermal diffusivity of the samples was measured by the laser flash method, and the temperature dependences of the thermal conductivity were calculated considering the porosity of the samples.

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Funding

The work was supported through a grant from the President of the Russian Federation for state support of young scientists—candidates of science, MK-2479.2022.1.3.

Measurements of the heat capacity of Nd2Hf2O7 and Gd2Hf2O7 were carried out with the support of a scholarship from the President of the Russian Federation for A.V. Guskov.

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Authors and Affiliations

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

    P. G. Gagarin, A. V. Guskov, V. N. Guskov, A. V. Khoroshilov & K. S. Gavrichev

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  1. P. G. Gagarin
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  2. A. V. Guskov
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  3. V. N. Guskov
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  4. A. V. Khoroshilov
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  5. K. S. Gavrichev
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Correspondence to P. G. Gagarin.

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Translated by G. Kirakosyan

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Gagarin, P.G., Guskov, A.V., Guskov, V.N. et al. Thermophysical Properties of Lanthanum and Samarium Zirconate—Hafnates. Russ. J. Inorg. Chem. 68, 1768–1775 (2023). https://doi.org/10.1134/S0036023623602192

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