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首页> 外文期刊>Physical review >Effective dielectric function of porous Pb(Mg_(1/3)Nb_(2/3))O_3 ceramics
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Effective dielectric function of porous Pb(Mg_(1/3)Nb_(2/3))O_3 ceramics

机译：多孔Pb（Mg_（1/3）Nb_（2/3））O_3陶瓷的有效介电功能

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摘要

A set of Pb(Mg_(1/3)Nb_(2/3))O_3 (PMN) relaxor ceramics with different porosities (66-96% of theoretical density) was processed from the pure perovskite PMN powder by varying the sintering temperature (930-980 K) and isostatic pressure. The effective room temperature permittivity at 100 Hz varied correspondingly from ～4000 to ～15 000. We measured and fitted the room temperature infrared (IR) reflectivity of corresponding polished ceramics, from which the effective dielectric function was obtained. The results were compared with the low-frequency permittivity data and discussed using several effective medium models. The best results were obtained using the Lichtenecker model (with the exponent α ≈ 0.2), which fits quite well the IR spectra as well as the static permittivity for all the porosity values. Also the simulation using the finite element method supported the same model. It allows us to conclude that the samples show quite complex shape and topology of the pores, but all of the pores show similarity with a weak nonzero percolation (open porosity).
机译：通过改变烧结温度，从纯钙钛矿PMN粉末中加工出一组具有不同孔隙度（理论密度的66-96％）的Pb（Mg_（1 / 3Nb_（2/3））O_3（PMN）弛豫陶瓷。 930-980 K）和等静压。 100 Hz时的有效室温介电常数在〜4000至〜15000之间变化。我们测量并拟合了相应抛光陶瓷的室温红外（IR）反射率，从而获得了有效的介电功能。将结果与低频介电常数数据进行了比较，并使用几种有效的介质模型进行了讨论。使用Lichtenecker模型（指数α≈0.2）可获得最佳结果，该模型非常适合所有孔隙率值的IR光谱以及静态介电常数。同样，使用有限元方法进行的仿真也支持相同的模型。它可以使我们得出结论，样品显示出非常复杂的孔形状和拓扑结构，但是所有孔都显示出相似性，并且具有弱的非零渗流（开孔率）。

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