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首页> 外文会议>International Conference on Ferrites >COMPARATIVE STUDY OF TETRAVALENT AND PENTAVALENT IONS INFLUENCE ON TRANSPOSE PROPERTIES OF COPPER FERRITE
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COMPARATIVE STUDY OF TETRAVALENT AND PENTAVALENT IONS INFLUENCE ON TRANSPOSE PROPERTIES OF COPPER FERRITE

机译：四价和五价离子对铜铁素体跨膜性能影响的对比研究

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Comparative studies of transpose properties on substitution of tetravalent and pentavalent cations viz. Ti~(4+) and Nb~(5+) in copper ferrite are carried out. Two series of ferrites having compositional formula Cu_(0.5+x) Ti_x Fe_(2.5-2x)O_4 and Cu_(0.5+2x) Nb_x Fe_(2.5-3x)O_4 (x varies from 0.00 to 0.45 in steps of 0.05) have been prepared. The resistivity is found to be more for tetravalent cation possessed ferrites than pentavalent (Nb) ferrites. The plots of log.ρ Vs. 10~3/T have shown three regions with two breaks corresponding to different conduction mechanisms and activation energy is computed in these regions. At high temperature structural phase transition from tetragonal to cubic is observed. The observed Seebeck coefficient (thermoelectric power, Q) with 'x' is exhibited n-type conduction while mixed conduction observed with 'T'. Charge carrier concentration (n) and drift mobility is also computed. The variation of 'Q' and 'n' with temperature reflected change from n-type to p-type conduction and magnetic phase transition. Tetravalent cation is more capable for development of high resistivity ferrites while the pentavalent cation is useful for high conductivity ferrite development.
机译：四价邻近阳离子脱位偶联性偶转性能的比较研究。进行铜铁氧体中的Ti〜（4+）和Nb〜（5+）。已有两种系列铁氧体具有组成式Cu_（0.5 + x）Ti_x Fe_（2.5-2x）O_4和Cu_（0.5 + 2x）Nb_x Fe_（2.5-3x）O_4（x的0.05的0.05的0.45）已经存在准备好了。发现电阻率更多用于四价阳离子具有比五甲甲酯（Nb）铁氧体具有的铁氧体。 log.ρ与10〜3 / t已经示出了三个区域，其两个断裂对应于不同的传导机构，并且在这些区域中计算激活能量。观察到从四边形到立方的高温结构相转变。观察到的eCebeck系数（热电力，Q）具有“X”，在用'T'观察到的混合传导。还计算了电荷载流子浓度（n）和漂移流动性。 “Q”和“N”的变化与温度反射从N型变为p型导通和磁相转变。四价阳离子更能为高电阻率铁氧体的发展，而五价阳离子可用于高电导率铁氧体发育。

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