Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 34, Issue 1, Pages 43-49Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2013.07.020
Keywords
Ferroelectrics; High temperature dielectrics; Capacitor; Thick films
Categories
Funding
- Deutsche Forschungsgemeinschaft through the Leibniz program [RO 954/22]
- Alexander-von-Humboldt foundation
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Thick films with compositions (1-x)(0.94Bi(1/2)Na(1/2)TiO(3)-0.06BaTiO(3))-x(K0.5Na0.5NbO3) (x = 0, 0.03, 0.09 and 0.18) have been prepared and their structural and electrical properties have been investigated. Dielectric properties show that these films are well suited for high-temperature applications due to their low variance in permittivity (<15%) over large temperature ranges. The thick film with x = 0.18 offers an operational temperature range from room temperature to 350 degrees C. Films with x = 0.03 and 0.09 also possess a stabile permittivity up to 400 degrees C. The improvement in the thermal stability of the permittivity is attributed to the addition of K0.5Na0.5NbO3 which leads to breaking of the long-range order in the materials. However, the polarizability of the materials was found to decrease possibly due to the clamping effect of the substrate. The characteristics of each film are discussed based on dielectric and electrical properties. (C) 2013 Elsevier Ltd. All rights reserved.
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