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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Semiconductor to metallic transition and polaron conduction in nanostructured cobalt ferrite
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Semiconductor to metallic transition and polaron conduction in nanostructured cobalt ferrite

机译：纳米结构钴铁氧体中半导体到金属的跃迁和极化子传导

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In this paper we report semiconductor to metal transition and polaron conduction in nanostructured cobalt ferrite. The material was prepared by the coprecipitation technique. Average particle size was determined to be ～10 nm by x-ray diffraction and transmission electron microscope analysis. A detailed electrical characterization was performed in the frequency range 20 Hz-2 MHz and temperature range between 300 and 400 K. Nanostructured cobalt ferrite exhibits semiconductor behaviour from 300 to 330 K. From 330 to 400 K it has metallic behaviour. The change at ～330 K is attributed to a change in cation distribution as obtained from M?ssbauer spectroscopy. The ac conductivity of cobalt ferrite followed σ_(ac) ∝ ω~s dependence. The observed variation of the exponent 's' with temperature suggests that overlapping large polaron tunnelling is the dominant conduction mechanism from 300 to 400 K and in the frequency range 20 Hz-2 MHz.
机译：在本文中，我们报告了纳米结构钴铁氧体中半导体到金属的跃迁和极化子传导。该材料是通过共沉淀技术制备的。通过X射线衍射和透射电子显微镜分析确定平均粒径为〜10nm。在20 Hz-2 MHz的频率范围和300至400 K的温度范围内进行了详细的电学表征。纳米结构的钴铁氧体表现出300至330 K的半导体性能。从330至400 K具有金属性能。 〜330 K处的变化归因于从Msssbauer光谱学获得的阳离子分布的变化。钴铁氧体的交流电导率遵循σ_（ac）∝ω〜s依赖性。观察到的指数's'随温度的变化表明，重叠的大极化子隧穿是300至400 K且在20 Hz-2 MHz频率范围内的主要传导机制。

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