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High Dielectric Constant in ACu3Ti4O12 and ACu3Ti3FeO12 Phases

✍ Scribed by M.A. Subramanian; Dong Li; N. Duan; B.A. Reisner; A.W. Sleight

Publisher: Elsevier Science
Year: 2000
Tongue: English
Weight: 138 KB
Volume: 151
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.2000.8703

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✦ Synopsis

High dielectric constants have been found in oxides of the type ACu 3 Ti 4 O 12 . The most exceptional behavior is exhibited by CaCu 3 Ti 4 O 12 , which shows a dielectric constant at 1 kHz of about 12,000 that is nearly constant from room temperature to 3003C. The cubic structure of these materials is related to that of perovskite (CaTiO 3 ), but the TiO 6 octahedra are tilted to produce a square planar environment for Cu 2؉ . The CaCu 3 Ti 4 O 12 structure down to 35 K has been examined by neutron powder di4raction. 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.

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