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Issue 30, 2015
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Phase transition characteristics and associated piezoelectricity of potassium-sodium niobate lead-free ceramics

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Abstract

To achieve high piezoelectric activity and a wide sintering temperature range, the ceramic system concerning (1 − x)(K0.48Na0.52)(Nb0.96Sb0.04)O3x[Bi0.5(Na0.7Ag0.3)0.5]0.90 Zn0.10ZrO3 was designed, and the rhombohedral–tetragonal (R–T) phase boundary can drive a high d33. Phase transition characteristics as well as their effects on the electrical properties were investigated systematically. The R–T coexistence phase boundary (0.04 ≤ x ≤ 0.05) can be driven via modification with BNAZZ, and has been confirmed by XRD and temperature-dependent dielectric constants as well as Raman analysis, and the ceramics possess enhanced piezoelectric properties (d33 ∼ 425 pC N−1 and kp ∼ 0.43) and a high unipolar strain (∼0.3%). In addition, a wide sintering temperature range of 1050–1080 °C can warrant a large d33 of 400–430 pC N−1, which can benefit practical applications. As a result, the addition of BNAZZ is an effective method to improve the electrical properties (piezoelectricity and strain) and sintering behavior of potassium-sodium niobate ceramics.

Graphical abstract: Phase transition characteristics and associated piezoelectricity of potassium-sodium niobate lead-free ceramics

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Publication details

The article was received on 12 May 2015, accepted on 17 Jun 2015 and first published on 18 Jun 2015


Article type: Paper
DOI: 10.1039/C5DT01779C
Dalton Trans., 2015,44, 13688-13699

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    Phase transition characteristics and associated piezoelectricity of potassium-sodium niobate lead-free ceramics

    Y. Wang, L. Hu, Q. Zhang and H. Yang, Dalton Trans., 2015, 44, 13688
    DOI: 10.1039/C5DT01779C

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