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首页> 外文期刊>Romanian journal of physics >HF STUDY OF THE ELECTRICAL PERMITTIVITY FOR SOME PEROVSKTTE-LIKE SYSTEMS FROM TWO DIMENSIONAL PEROVSKTTE LAYER FAMILY
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HF STUDY OF THE ELECTRICAL PERMITTIVITY FOR SOME PEROVSKTTE-LIKE SYSTEMS FROM TWO DIMENSIONAL PEROVSKTTE LAYER FAMILY

机译：二维钙钛矿层族中某些类似钙钛矿症状的电导率的HF研究

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摘要

The metal organic compounds consisting of organic groups covalently or ionically bound to inorganic layers present special properties for applications, starting with organic synthesis and finishing with the nonlinear optical applications, switching and memory applications. We have considered here the two dimensional perovskite layer family [(NH_3)-(CH_2)_n-(NH_3)] MX_4, with n = 2, 3,..., where M is a metal like Mn, Fe, Cu, Cd, etc. and X = Cl, Br. A simulation study was performed for characterizing the electric behavior of some compounds from the considered family, in the frequency range of 1-10 GHz, motivated by the fact that not cogent results are available yet in literature for the microwave range. Structural simulations were performed with help of the High Frequency Structural Simulator. Physical structure of the molecular composite compounds was re-constructed considering the indication from literature. For the electric anisotropic materials, electric permittivity was determined from energy density variations at field propagation through the material samples. A resonant behavior was found, depending on the internal order by constituents' nature and their spatial disposure. Resonances shift by internal parameters modifications (ionic radii, ion relative disposure, dimensions of the basic cell, etc.). Conclusions were synthesized for a structural interpretation of the permittivity peaks. A thermal analysis performed above 273 K confirms relaxation phenomena inside the material, which involves large reorientable dipoles in the total polarization. A peak around 310-390 K depending on the composition indicates that the most of the two dimensional perovskite layer family members are dipolar relaxation ferroelectrics. Microwave dielectric loss was also determined. The curves tan 8 versus frequency are available in the range of 1-10 GHz. The obtained values indicate low to medium losses in microwave range for the considered perovskites.
机译：由共价或离子键合至无机层的有机基团组成的金属有机化合物具有特殊的应用性能，从有机合成开始，到非线性光学应用，开关和存储应用结束。我们在这里考虑了二维钙钛矿层族[（NH_3）-（CH_2）_n-（NH_3）] MX_4，其中n = 2，3，...，其中M是诸如Mn，Fe，Cu，Cd之类的金属，等等。X= Cl，Br。进行了仿真研究，以表征在1-10 GHz频率范围内所考虑家族的某些化合物的电学行为，这是由于微波范围内的文献尚无令人信服的结果这一事实所致。在高频结构仿真器的帮助下进行了结构仿真。考虑到文献中的指示，重构了分子复合化合物的物理结构。对于电各向异性材料，通过在穿过材料样品的场传播时的能量密度变化来确定介电常数。发现了共振行为，这取决于成分的性质和空间位置取决于内部顺序。共振通过内部参数修改（离子半径，离子相对位置，基本单元的尺寸等）而发生变化。结论是合成的介电常数峰的结构解释。在273 K以上进行的热分析证实了材料内部的弛豫现象，该现象涉及总极化中较大的可重定向偶极子。取决于组成，在310-390 K附近的峰表明二维钙钛矿层族成员中的大多数是偶极弛豫铁电体。还确定了微波介电损耗。 tan 8与频率的曲线在1-10 GHz范围内可用。所获得的值表明，对于所考虑的钙钛矿，在微波范围内损耗低至中等。

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