Open AccessВлияние мультиплетных уровней Sm-=SUP=-3+-=/SUP=- и Eu-=SUP=-3+-=/SUP=- на теплоемкость мультиферроика BiFeO-=SUB=-3-=/SUB=-
Author(s) -
Р.Г. Митаров,
С.Н. Каллаев,
З.М. Омаров,
О.М. Назарова,
Л.А. Резниченко
Publication year - 2021
Publication title -
fizika tverdogo tela
Language(s) - English
Resource type - Journals
eISSN - 1726-7498
pISSN - 0367-3294
DOI - 10.21883/ftt.2021.06.50936.275
Subject(s) - bismuth , bismuth ferrite , ion , samarium , multiferroics , europium , materials science , heat capacity , substructure , praseodymium , analytical chemistry (journal) , condensed matter physics , crystallography , inorganic chemistry , chemistry , physics , ferroelectricity , dielectric , metallurgy , thermodynamics , optoelectronics , organic chemistry , structural engineering , chromatography , engineering
The temperature dependence of the heat capacity of the multiferroics BiFeO3, Bi0.90Sm0.10FeO3, and Bi0.90Eu0.10FeO3 has been studied. It was found that the substitution of europium and samarium ions for bismuth ions in bismuth ferrite leads to the appearance of an additional heat capacity component due to transitions of 4f - electrons of rare earth ions to higher levels of the multiplet. A connection is established between the decrease in phonon thermal conductivity and the Schottky effect for the specific heat.