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W832003138 abstract "[ <TEX>$Bi_{2/3}La_{1/3}FeO_3$</TEX> ]분말을 졸-겔법을 이용하여 제조하였다. 결정학적 및 자기적 성질을 열분석장치(TG-DTA), x-선 회절분석기(XRD), 주사전자현미경(SEM) 및 Mossbauer분광기를 이용하여 연구하였다. <TEX>$Bi_{2/3}La_{1/3}FeO_3$</TEX> 단일상은 <TEX>$600^{circ}C$</TEX>에서 3시간 동안 공기 중에서 열처리하여 얻을 수 있었으며, x-선 회절분석 결과 <TEX>$Bi_{2/3}La_{1/3}FeO_3$</TEX> 분말은 rhombohedral 형태로 변형된 단순 perovskite 구조를 가졌으며 이때 격자상수 <TEX>$=3.985pm0.0005{AA},;alpha=89.5^{circ}$</TEX>이었다. Mossbauer스펙트럼 분석결과 <TEX>$Bi_{2/3}La_{1/3}FeO_3$</TEX>의 Neel온도는 <TEX>$680pm3K$</TEX>임을 알 수 있었다. <TEX>$Bi_{2/3}La_{1/3}FeO_3$</TEX>의 이성질체이동 값은 0.27mm/s 값을 가졌으며, 이는 <TEX>$Bi_{2/3}La_{1/3}FeO_3$</TEX>.의 Fe 이온이 가지는 이온가는 <TEX>$Fe^{3+}$</TEX>의 high spin상태임을 보여주었다. <TEX>$Bi_{2/3}La_{1/3}FeO_3$</TEX>의 결정내의 Debye 온도는 <TEX>$305pm5K$</TEX> 평균 초미세 자기장 <TEX>$H_{hf}(T)$</TEX>는 <TEX>$T/T_N<0.7$</TEX>영역에서 <TEX>$[H_{hf}(T)-H_{hf}(0)]/H_{hf}(0)=-0.42(T/T_N)^{3/2}-0.13(T/T_N)^{5/2}$</TEX>로 spin wave가 결정 내에서 잘 여기 됨을 알 수 있었다. La substituted perovskite <TEX>$BiFeO_3$</TEX> have been prepared by a sol-gel method. Magnetic and structural properties of the powders were characterized with Mossbauer spectroscopy, XRD, SEM, and TG-DTA. The crystal structure is found to be a rhombohedrally distorted perovskite structure with the lattice constant <TEX>$alpha=3.985{AA};and;alpha=89.5^{circ}.;Bi_{2/3}La_{1/3}FeO_3$</TEX> powders that were annealed at and above <TEX>$600^{circ}C$</TEX> have a single-phase perovskite structure. However, powders annealed at <TEX>$900^{circ}C$</TEX> have a typical perovskite structure with small amount of <TEX>$Bi_2O_3$</TEX> phase. The Neel temperature of <TEX>$Bi_{2/3}La_{1/3}FeO_3$</TEX> is found to be <TEX>$680pm3K$</TEX>. The isomer shift value at room temperature is found to be 0.27 mm/s relative to the Fe metal, which is consistent with high-spin <TEX>$Fe^{3+}$</TEX> charge states. Debye temperature far<TEX>$Bi_{2/3}La_{1/3}FeO_3$</TEX> is found to be <TEX>$305pm5K$</TEX>. The average hyperfine field <TEX>$H_{hf}(T)$</TEX> of the <TEX>$Bi_{2/3}La_{1/3}FeO_3$</TEX>, shows a temperature dependence of <TEX>$[H_{hf}(T)-H_{hf}(0)]/H_{hf}(0)=-0.42(T/T_N)^{3/2}-0.13(T/T_N)^{5/2}$</TEX> for <TEX>$T/T_N<0.7$</TEX> indicative of spin-wave excitation." @default.
W832003138 created "2016-06-24" @default.
W832003138 creator A5032514342 @default.
W832003138 date "2006-02-01" @default.
W832003138 modified "2023-09-26" @default.
W832003138 title "Mössbauer Studied of Multiferroic Bi2/3La1/3FeO3Nanoparticles" @default.
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W832003138 doi "https://doi.org/10.4283/jkms.2006.16.1.028" @default.
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