High dielectric constant in ACu3Ti4O12 and ACu3Ti3FeO12 phases
High dielectric constant in ACu3Ti4O12 and ACu3Ti3FeO12 phases
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DOI：
10.1006/jssc.2000.8703
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发表时间：
2000-05-01
影响因子：
3.3
通讯作者：
Sleight, AW
中科院分区：
文献类型：
--
作者：
Subramanian, MA;Li, D;Sleight, AW
在ACU(3)Ti(4)O(12)型氧化物中发现了高介电常数。最特殊的行为是CaCu3Ti4O12，它在1 kHz处的介电常数约为12,000，从室温到300℃几乎是恒定的，这些材料的立方结构与钙钛矿(CaTiO3)有关，但TiO6八面体倾斜，为Cu2+提供了一个正方形的平面环境。用中子粉末衍射法研究了低至35K的CaCu3Ti4O12结构。A(2/3)Cu(3)Ti(4)O(12)(A=三价稀土或铋)类化合物的大部分介电常数均在1000以上。文中还给出了Acu(3)Ti(3)FeO(12)等结构化合物的介电性能。(C)2000年学术出版社。
High dielectric constants have been found in oxides of the type ACu(3)Ti(4)O(12). The most exceptional behavior is exhibited by CaCu3Ti4O12, which shows a dielectric constant at 1 kHz of about 12,000 that is nearly constant from room temperature to 300 degrees C, The cubic structure of these materials is related to that of perovskite (CaTiO3), but the TiO6 octahedra are tilted to produce a square planar environment for Cu2+. The CaCu3Ti4O12 structure down to 35 K has been examined by neutron powder diffraction. The structure remains cubic and centric, Most compositions of the type A(2/3)Cu(3)Ti(4)O(12) (A = trivalent rare earth or Bi) show dielectric constants above 1000, The dielectric properties of isostructural compounds of the type ACu(3)Ti(3)FeO(12) are also presented. (C) 2000 Academic Press.