Improved Dielectric and Nonlinear Electrical Properties of Fine‐Grained CaCu3Ti4O12 Ceramics Prepared by a Glycine‐Nitrate Process. Issue 6 (31st January 2014)

• Record Type: Journal Article
• Authors: Thongbai, Prasit; Yamwong, Teerapon; Maensiri, Santi; Amornkitbamrung, Vittaya; Chindaprasirt, Prinya; Damjanovic, D.
• Is Part Of: Journal of the American Ceramic Society. Volume 97:Issue 6(2014)
• Page Start: 1785
• Page End: 1790
• Publication Date: 2014-01-31
• Subjects: Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.12812
• Languages: English
• ISSNs: 0002-7820

Abstract

<abstract abstract-type="main" id="jace12812-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p>Pure CaCu₃Ti₄O₁₂ was successfully prepared by a glycine‐nitrate process using a relatively low calcination temperature and short reaction time of 760°C for 4 h. Fine‐grained CaCu₃Ti₄O₁₂ ceramics with dense microstructure and small grain size were obtained after sintering for 1 h. The nonlinear coefficient of a fine‐grained CaCu₃Ti₄O₁₂ ceramic calculated in the range 1–10 mA/cm² was found to be very high of ~16.39 with high breakdown electric field strength of 1.46 × 10⁴ V/cm. This fine‐grained CaCu₃Ti₄O₁₂ ceramic also exhibited a very low loss tangent of 0.017 at 20°C with temperature stability over the range −55°C to 85°C. The grain growth rate of the CaCu₃Ti₄O₁₂ ceramics was found to be very fast after increasing the sintering time from 1.5 to 3 h, leading to formation of a coarse‐grained CaCu₃Ti₄O₁₂ ceramic with grain size of about 100–200 μm. The dielectric permittivity of this coarse‐grained ceramic was found to be as high as 1.03 × 10⁵ with a low loss tangent of 0.054.</p> </abstract>