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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Study of the dielectric properties of the perovskite LaMn0.5Co0.5O3-delta
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Study of the dielectric properties of the perovskite LaMn0.5Co0.5O3-delta

机译:钙钛矿LaMn0.5Co0.5O3-δ介电性能的研究

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Polycrystalline samples of the charge ordered mixed oxide LaMn0.5CO0.5O3-delta (T-CO = 400 K) have been prepared by the nitrate decomposition method. These samples are biphasic, according to XRPD, and except one, oxygen defficient (delta similar to 0.04-0.05). The study of the dielectric properties of these samples reveal that LaMn0.5Co0.5O3-delta displays a high dielectric constant, specialty at room temperature and low frequencies. This epsilon'(r) is seen to be strongly dependent on the particle size and not so much on the oxygen defficiency and the best properties are found in the sample with biggest particle size (phi = 7 mu m) for which epsilon'(r) (300 K) similar to 10(5) Up to 2 x 10(4) Hz. Analysis of the role of the grain size and the electrode contacts on the obtained data reveal that this mixed oxide has an intrinsic dielectric constant that is rather high for this type of compounds (epsilon'(r,infinity) similar to 30) and that is further enhanced by extrinsic Maxwell-Wagner effects. We relate such enhanced intrinsic dielectric constant to the electronic process of charge ordering present in this material below 400 K.
机译:通过硝酸盐分解法制备了带电荷有序混合氧化物LaMn0.5CO0.5O3-δ(T-CO = 400 K)的多晶样品。根据XRPD,这些样品是两相的,除了一个是氧气效率差(δ类似于0.04-0.05)。对这些样品的介电性能的研究表明,LaMn0.5Co0.5O3-delta具有较高的介电常数,在室温和低频下具有特殊性。该ε'(r)与颗粒大小密切相关,而与氧缺乏度关系不大,在具有最大粒径(phi = 7μm)的样品中发现了最佳性能,而ε(r) )(300 K)类似于10(5)高达2 x 10(4)Hz。根据获得的数据对晶粒尺寸和电极触点的作用进行分析,发现该混合氧化物具有固有介电常数,对于这种类型的化合物而言,其固有介电常数非常高(ε'(r,infinity)类似于30),即外在的麦克斯韦-瓦格纳效应进一步增强了该效应。我们将这种增强的固有介电常数与这种材料在400 K以下存在的电荷有序电子过程联系起来。

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