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首页> 外文期刊>IEEE Transactions on Magnetics >Enhanced Anisotropy in Tetragonalized (Cu,Co)Fe2O4 Particles via the Jahn–Teller Effect of Cu2+ Ions
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Enhanced Anisotropy in Tetragonalized (Cu,Co)Fe2O4 Particles via the Jahn–Teller Effect of Cu2+ Ions

机译：Cu 2 + 离子的Jahn–Teller效应增强四方化（Cu，Co）Fe 2 O 4 粒子的各向异性

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摘要

We studied the Jahn-Teller (JT) effect of Cu2+ ions on the tetragonalization of CuFe2O4 and (Cu,Co)Fe2O4 particles. Sub-micrometer-sized CuFe2O4 and (Cu,Co)Fe2O4 particles were synthesized via coprecipitation and flux methods, followed by a heat-treatment process. From the X-ray diffraction patterns, all particles were found to be cubic spinel after flux treatment. The tetragonalization process was carried out by a heat-treatment process in air, where the temperature was varied between 700 °C and 900 °C, followed by furnace cooling. We confirmed that the ideal temperature for the tetragonalization of both CuFe2O4 and (Cu,Co)Fe2O4 is 900 °C. The obtained single-phase tetragonal spinel-structured CuFe2O4 and (Cu,Co)Fe2O4 particles indicate tetragonal distortion as a consequence of the JT effect of the Cu2+ ions. The results of saturation magnetization suggest that most of the divalent ions are in the B sites. The lengthening of the c-axis due to the JT effect increased the coercivity of the CuFe2O4 and (Cu,Co)Fe2O4 particles during the cubic-tetragonal phase transformation. The tetragonal (Cu,Co)Fe2O4 particles showed a saturation magnetization of 26 emu/g and a coercivity of 2200 Oe.
机译：我们研究了Cu 2 + 离子对CuFe 2 O 4 和（Cu，Co）四方化的Jahn-Teller（JT）效应Fe 2 O 4 颗粒。合成了亚微米级的CuFe 2 O 4 和（Cu，Co）Fe 2 O 4 颗粒通过共沉淀和助熔剂方法，然后进行热处理工艺。从X射线衍射图可以看出，所有的颗粒在经过助熔剂处理后都是立方尖晶石。通过在空气中的热处理过程进行四方化过程，在该过程中温度在700°C和900°C之间变化，然后进行炉冷。我们确认了CuFe 2 O 4 和（Cu，Co）Fe 2 O 4 < / sub>为900°C。获得的单相四方尖晶石结构的CuFe 2 O 4 和（Cu，Co）Fe 2 O 4 颗粒表示由于Cu 2 + 离子的JT效应而导致的四方畸变。饱和磁化强度的结果表明，大多数二价离子位于B位。由于JT效应而导致的c轴加长增加了CuFe 2 O 4 和（Cu，Co）Fe 2 的矫顽力立方四方相变过程中的O 4 粒子。方形（Cu，Co）Fe 2 O 4 颗粒的饱和磁化强度为26 emu / g，矫顽力为2200 Oe。

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