Pb（Fe1/2Nb1/2）1- xTixO3单晶界面极化引起的巨介电和负介电调谐
Giant and negative dielectric tunability induced by interfacial polarization in Pb(Fe1/2Nb1/2)1-xTixO3 single crystals
摘要：
本文报道了Pb（Fe_（1/2）Nb_（1/2））_（1-x）Ti_xO_3单晶的巨介电和负介电调谐特性。在120 V/cm的低场作用下，电容值大幅下降，室温下低频（<1 MHz）调谐率大于80%。这种巨大的可调谐性归因于电极/样品界面处的界面极化。一个负的介电可调谐性检测到只有在tetraxite样品也可以归因于界面极化。分别用多极化机制模型和等效电路模型讨论了巨可调谐性和负可调谐性的起源。
英文摘要：
The giant and negative dielectric tunability of Pb(Fe1/2Nb1/2)1-xTixO3 single crystals is reported. A low field of 120 V/cm can induce a great reduction of the capacitance, and the tunability is larger than 80% in low frequency range (<1 MHz) at room temperature. This giant tunability is ascribed to the interfacial polarization at the interface of electrode/sample. A negative dielectric tunability detected only in the tetragonal sample can be also attributed to the interfacial polarization. The origin of the giant and negative tunabilities is discussed with the multipolarization-mechanism model and equivalent circuit model, respectively.
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