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Erschienen in:
07.07.2016
Structural and electrical properties of Aurivillius oxide K0.25Na0.25Bi2.5Nb2O9 with potassium and cerium modification
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 11/2016
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Abstract
K0.25Na0.25Bi2.5Nb2O9 (KNBN) ceramics with (K,Ce) additives modification were synthesized by using the conventional solid-state reaction method. Phase structure and morphology were characterized by using X-ray diffraction analyses and scanning electron microscopy. Effects of (K,Ce) additives on structural and electrical properties of the KNBN ceramic are investigated. Piezoelectric properties of the KNBN ceramic are improved significantly and the piezoelectric permittivity of the (K,Ce) modified KNBN ceramics shows a temperature-independent characteristics. A maximum of piezoelectric coefficients of 28 pC/N, a high Curie temperature of 593 °C and high resistivity of higher than 108 Ω cm at 500 °C for the KNBN + 1.0 % (K,Ce) ceramic are obtained. The governing mechanism for the enhancement of piezoelectric performance of the KNBN ceramic is discussed.