Phonon Scattering by Paramagnetic Ions of Europium and Samarium in Bismuth Ferrite

Influence of the Multiplet Levels of Sm3+ and Eu3+ on the Heat Capacity of Multiferroic BiFeO3

“…Earlier [3], we have investigated the temperature dependence of thermal diffusion and thermal conductivity of multiferroics BiFeO 3 , Bi 0.90 Sm 0.10 FeO 3 , and Bi 0.90 Eu 0.10 FeO 3 . It was found that the substitution of bismuth ions with europium and samarium ions in bismuth ferrite leads to a decrease in the phonon thermal conductivity of these multiferroics in a wide range of temperatures due to resonant scattering of phonons at multiplet levels of rare earth ions.…”

“…In [3], the results of an experimental study of the thermal conductivity of bismuth ferrite doped with samarium and europium ions are reported. It was found that a decrease in the thermal conductivity (Δλ res ) of bismuth ferrite upon doping with rare earth ions of samarium and europium is caused by scattering of phonons at the multiplet levels of these ions.…”