Microwave synthesis of high dielectric constant CaCu3Ti4O12
β Scribed by Hongtao Yu; Hanxing Liu; Dabing Luo; Minghe Cao
- Publisher
- Elsevier Science
- Year
- 2008
- Tongue
- English
- Weight
- 532 KB
- Volume
- 208
- Category
- Article
- ISSN
- 0924-0136
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β¦ Synopsis
In this work, single-phase cubic perovskite CaCu 3 Ti 4 O 12 powders have been synthesized successfully by microwave heating with a relatively low energy consumption and short time, compared with conventional synthesis. The reaction evolution of forming CCTO has been suggested according to the XRD data. The ceramics from microwave-synthesized powder was found to have higher dielectric constant than that from conventional synthesized powder under the same sintering conditions.
π SIMILAR VOLUMES
In the present work we demonstrate that in addition to the well-known colossal-dielectric-constant material CaCu 3 Ti 4 O 12 various members of the series Ln 2/3 Cu 3 Ti 4 O 12 with Ln = La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er and Tm also exhibit giant values of the dielectric constant. Just as C
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
A 10 mm thickness columned CaCu 3 Ti 4 O 12 ceramic was fabricated by the conventional solid-state reaction method and the dielectric properties of different parts in ceramic had been investigated. For the sample close to the surface, only one Debye-type relaxation around 10 7 Hz was observed at roo