Thermophysical properties of ceramics produced from nanocrystalline InFeZnO4 powder

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The paper discusses the results of a study of the structural and thermophysical characteristics of polycrystalline ceramics produced from the InFeZnO4 nanoparticles. It was found that the bulk density of the resulting material is ~86% of the theoretical one. Scanning electron microscopy has shown that it has a dense microcrystalline structure consisting of randomly oriented grains with dimensions of 5–20 µm. The thermal diffusivity of InFeZnO4 ceramics was studied using the laser flash method. It was found that as the temperature increases from 299 to 1273 K, it decreases from 1.29 to 0.44 mm2/s. Using adiabatic and differential scanning calorimetry, the temperature dependence of the heat capacity of InFeZnO4 was studied for the first time. It was established that the measured curve has no signs of the existence of phase transitions in the range from 83 to 923 K. Using experimental data on thermal diffusivity, heat capacity, and density, an equation for the dependence describing the change in thermal conductivity of the material under study in the range from 299 to 1273 K was obtained. It was revealed that ceramics produced from InFeZnO4 nanoparticles obtained by the polymer-salt method have a higher thermal conductivity compared to those synthesized by standard ceramic technology from a mixture of In2O3, Fe2O3 and ZnO oxides. The results obtained allow us to recommend InFeZnO4 as a basis for the creation of thermally stable functional materials with low thermal conductivity at high temperatures.

Sobre autores

O. Kondrat’eva

Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences

Email: ol.kondratieva@gmail.com
31 Leninsky Prospect, Moscow, 119991 Russia

M. Smirnova

Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences

Email: ol.kondratieva@gmail.com
31 Leninsky Prospect, Moscow, 119991 Russia

G. Nikiforova

Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences

Email: ol.kondratieva@gmail.com
31 Leninsky Prospect, Moscow, 119991 Russia

A. Tyurin

Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences

Email: ol.kondratieva@gmail.com
31 Leninsky Prospect, Moscow, 119991 Russia

V. Ketsko

Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences

Autor responsável pela correspondência
Email: ol.kondratieva@gmail.com
31 Leninsky Prospect, Moscow, 119991 Russia

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