Thermophysical Properties of Solid Solutions of Bi1 –xNdxFe1 –xMnxO3 (x = 0.03, 0.09) Multiferroics at High Temperatures

Abstract

The thermal diffusivity, thermal conductivity, and specific heat of solid solutions of Bi_1–xNd_xFe_{1 –x}Mn_xO₃ (x = 0.03, 0.09) multiferroics have been studied in a wide temperature range (above room temperature). It is established that substitutions Nd³⁺ → Bi³⁺ and Mn³⁺ → Fe³⁺ in BiFeO₃ lead to a decrease in the thermal diffusivity and thermal conductivity of Bi_1–xNd_xFe_1–xMn_xO₃ solid solutions and reduce the temperatures of antiferromagnetic and ferroelectric orderings. The temperature dependence of the phonon mean free path is found. The factors limiting the phonon transfer in samples are determined.