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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Dielectric relaxation of (N(C2H5)(4))(2)CoCl2Br2 nanocrystallites incorporated into the PMMA matrix
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Dielectric relaxation of (N(C2H5)(4))(2)CoCl2Br2 nanocrystallites incorporated into the PMMA matrix

机译：（N（C2H5）（4））（2）CoCl2Br2纳米晶体并入PMMA基质的介电弛豫

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摘要

The dielectric properties of tetraethylammonium dibromo-dichloro-cobaltate (N(C2H5)(4))(2)CoCl2Br2 (TEA-CBC) nanocrystallites incorporated into the polymethylmethacrylate (PMMA) matrix were investigated within the spectral range of 3 x 10(5)-3 x 10(9) Hz in the temperature range of 90-300 K. The considerable difference of the dielectric spectra of the nanocomposite compared to the TEA-CBC crystal and to the pure PMMA matrix was observed. The phenomenon of the 'negative capacity' has been found in the considered material. Its dependence on the NC content was investigated. Temperature investigations of the dielectric permittivity for the TEA-CBC NC incorporated into the polymer PMMA matrices have shown the sharp-like resonance dependences of the imaginary part of the dielectric permittivity near 1.2 GHz. The intensity of the corresponding resonance peaks increase sub-linearly with increasing NC content. Taking into account the substantial growth of the imaginary part of the permittivity with increasing NC concentration, one can assume that the main contribution to the effect is given by the interface NC-PMMA regions. Additional experiments were performed to eliminate the influence of 'geometry factor'. (c) 2007 Elsevier B.V. All rights reserved.
机译：在3 x 10（5）的光谱范围内研究了掺入聚甲基丙烯酸甲酯（PMMA）基质中的四溴二溴-二氯钴酸四乙铵（N（C2H5）（4））（2）CoCl2Br2（TEA-CBC）纳米微晶的介电性能。在90-300 K的温度范围内为-3 x 10（9）Hz。与TEA-CBC晶体和纯PMMA基质相比，纳米复合材料的介电谱存在显着差异。在所考虑的材料中发现了“负容量”现象。研究了其对NC含量的依赖性。对掺入聚合物PMMA基质中的TEA-CBC NC的介电常数的温度研究表明，介电常数的虚部在1.2 GHz附近具有尖锐的共振依赖性。相应共振峰的强度随着NC含量的增加而呈亚线性增加。考虑到随着NC浓度的增加，介电常数的虚部将显着增长，因此可以假定，对这种作用的主要贡献是由NC-PMMA界面区域决定的。进行了其他实验，以消除“几何因子”的影响。 （c）2007 Elsevier B.V.保留所有权利。

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