尖晶石
拉曼光谱
材料科学
声子
拉曼散射
铁磁性
八面体
凝聚态物理
大气温度范围
脉冲激光沉积
散射
结晶学
晶体结构
薄膜
化学
光学
纳米技术
冶金
气象学
物理
作者
Ying-Yen Liao,Y. W. Li,Zhigao Hu,Junhao Chu
摘要
Lattice vibrations of highly a-axis oriented CoFe2O4 (CFO) films have been investigated by Raman scattering in the temperature range of 80-873 K. The five phonon modes T1g(2), T1g(3), Eg, A1g(1), A1g(2), and their evolutions can be uniquely distinguished. It was found that an electron transfer between Co2+ and Fe3+ cations occurs in octahedral sites at about 173 K. The structure disorder in the CFO films appears with increasing the temperature, which indicates the cation migration between tetrahedral and octahedral sites. The phenomena suggest the structural transformation trend from inverse spinel to normal spinel at the elevated temperatures.
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