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阻挡层电容对ACu3Ti4O12巨介电性能的影响研究
引用本文:周小莉,杜丕一.阻挡层电容对ACu3Ti4O12巨介电性能的影响研究[J].物理学报,2005,54(1):354-358.
作者姓名:周小莉  杜丕一
作者单位:(1)台州学院物理系,临海 317000浙江大学硅材料国家重点实验室,杭州 310027; (2)浙江大学硅材料国家重点实验室,杭州 310027
摘    要:用固相反应法成功地制备了ACu3Ti4O12(A=Ca,La,Y)系列陶瓷,在50—300K温区内测量了样品的介电性能,分析了交流电导与外场频率、温度的关系.发现在相同组分的CaCu3Ti4O12晶体中相对含量大于等于0776时,样品的相对介电常数可达104;而A位上价态为3+的化合物La2/3Cu3Ti4O12和Y2/3Cu3Ti4O12相对介电常数仅为103.分析表明,样品中内部阻挡层电容数目的多少直接对ACu3Ti4O12的相对介电常数产生影响.电导与温度及频率的关系是由电子、声子与外场的共同作用决定的. 关键词: ACu3Ti4O12 巨介电 晶相含量 阻挡层电容

关 键 词:ACu3Ti4O12  巨介电  晶相含量  阻挡层电容
收稿时间:2004-02-27

Effect of barrier capacity on dielectric characteristics of ACu3Ti4O12 ceramics
Zhou Xiao-Li and Du Pi-Yi.Effect of barrier capacity on dielectric characteristics of ACu3Ti4O12 ceramics[J].Acta Physica Sinica,2005,54(1):354-358.
Authors:Zhou Xiao-Li and Du Pi-Yi
Abstract:ACu3Ti4O12 (A=Ca, Y or La) ceramic materials have been successively fabricated by using the solid-state reaction method. In the temperature range of 50—300 K, the dielectric characteristics of the samples are measured and the relationship among the AC conductivity, external frequency and temperature is analyzed. It has been found that if the relative content of Ca in the CaCu 3Ti4O12 crystals with identical components is greater than or equal to 0 776, the dielectric constant of the samples can reach the value of 104 For the ceramic compounds with a 3+ covalence in the `A' site such as La2/3 Cu3Ti4O12 and Y2/3Cu3Ti4O12, however, the dielec tric constant is only of the order of 103 Further analysis shows that the di electric constant of the ACu3Ti4O12 materials is mainly related to the number density of the barrier capacity in the samples. The relationship amo ng the conductivity, frequency and temperature depends on the combination of act ion of electrons, phonons and external field.
Keywords:ACu3Ti4O12  gigantic dielectric  crystalline content (crystallinit y)  barrier capacity
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