Abstract

Temperature dependences of the thermal diffusivity and thermal conductivity in multiferroic materials BiFeO₃, Bi_0.90Sm_0.10FeO₃, and Bi_0.90Eu_0.10FeO₃ were studied. Substitution of rare-earth ions of europium and samarium for bismuth ions in bismuth ferrite was found to decrease the phonon thermal conductivity in a wide temperature range. The decrease in the heat conductivity of bismuth ferrite was determined to result from resonance phonon scattering by paramagnetic ions of europium and samarium.

中文翻译：

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Para和mar在顺磁性离子在铋铁氧体中的声子散射

摘要

研究了多铁性材料BiFeO ₃，Bi _0.90 Sm _0.10 FeO ₃和Bi _0.90 Eu _0.10 FeO ₃的热扩散率和导热率的温度依赖性。发现用fer和mar的稀土离子代替铁酸铋中的铋离子可在较宽的温度范围内降低声子的热导率。铋铁氧体的热导率降低被确定是由于from和para的顺磁性离子引起的共振声子散射。