Open AccessПроцессы теплопереноса в мультиферроиках Bi-=SUB=-1-x-=/SUB=-Ho-=SUB=-x-=/SUB=-FeO-=SUB=-3-=/SUB=- (x=0-0.20)
Author(s) -
S. N. Kallaev,
А. Г. Бакмаев,
Л. А. Резниченко
Publication year - 2020
Publication title -
fizika tverdogo tela
Language(s) - English
Resource type - Journals
eISSN - 1726-7498
pISSN - 0367-3294
DOI - 10.21883/ftt.2020.05.49244.04m
Subject(s) - thermal conductivity , thermal diffusivity , holmium , materials science , atmospheric temperature range , heat capacity , phase transition , condensed matter physics , phase (matter) , multiferroics , ferroelectricity , mean free path , phonon , antiferromagnetism , thermodynamics , chemistry , dielectric , physics , scattering , optics , laser , optoelectronics , organic chemistry , composite material
The thermal diffusivity and thermal conductivity of Bi1-xHoxFeO3 multiferroics (x = 0-0.20) were studied in the high-temperature range 300-1200K. It has been established that alloying with rare earth element with holmium leads to a noticeable increase in heat capacity in a wide temperature range T> 300 K and to a significant change in the temperature anomalies of thermal diffusion and thermal conductivity of the phase transition region. The dominant mechanisms of phonon heat transfer in the region of ferroelectric and antiferromagnetic phase transitions are considered. The dependence of the mean free path on temperature has been determined. Research results are discussed in conjunction with structural studies.