Engineering Physics Annotation << Back THERMOPHYSICAL PROPERTIES MULTIFFEROICS BiFeO3 S.N. KALLAEV, Z.M. OMAROV, A.G. BAKMAEV, R.G. MITAROV, L.A. REZNICHENKO The heat capacity, thermal diffusion and heat conductivity of Bi1–xRexFeO3 (Re = La, Eu, Ho; x = 0, x = 0,05) multiferroics has been studied in the temperature range of 120…1200 K. The substitution of a small amount of rare-earth elements for bismuth leads to a significant increase in the heat capacity in the broad temperature range studied. It is estab- lished that the temperature dependence of the excess heat capacity is related to the Schottky effect for three- level states that appear as a result of structure distortions in the rare-earth-doped compositions.The dominant mechanisms of phonon heat transfer in the region of ferroelectric and antiferromagnetic phase transitions have been revealed. The temperature dependence of the mean free path of phonons has been determined. Key words: multiferroics, heat capacity, heat conductivity, thermal diffusion, phase transition. Contacts: E-mail: kallaev-s@rambler.ru Pp. 038-044.