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Issue 37, 2015
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Dielectric, piezoelectric, and elastic properties of K0.8Na0.2NbO3 single crystals

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Abstract

A high-quality and large-sized K0.8Na0.2NbO3 single crystal was successfully grown using the top-seeded solution growth method (TSSG). The temperature dependence of the dielectric during the cooling and heating of [001]C- and [011]C-oriented K0.8Na0.2NbO3 single crystals was investigated. In order to better understand the crystal's piezoelectric properties, the complete and consistent set of dielectric, piezoelectric, and elastic constants of the [001]C-poled K0.8Na0.2NbO3 single crystal was measured for the first time, using ultrasonic and resonance methods. A large elastic stiffness constant value of cE11 = 27.4 × 1010 N m−2 was obtained; this provides the crystal with harder transverse mechanical adaptability in the [100]C direction. The [001]C-poled K0.8Na0.2NbO3 single crystal also exhibited high electromechanical coupling coefficients (k15 = 0.448, kt = 0.67). In addition, a comparison between the calculated and measured material constants confirmed that the orientation effect primarily contributes to the characteristics of the crystal.

Graphical abstract: Dielectric, piezoelectric, and elastic properties of K0.8Na0.2NbO3 single crystals

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Publication details

The article was received on 15 Jul 2015, accepted on 19 Aug 2015 and first published on 19 Aug 2015


Article type: Paper
DOI: 10.1039/C5TC02134K
Citation: J. Mater. Chem. C, 2015,3, 9609-9614
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    Dielectric, piezoelectric, and elastic properties of K0.8Na0.2NbO3 single crystals

    H. Tian, C. Hu, X. Meng, Z. Zhou and G. Shi, J. Mater. Chem. C, 2015, 3, 9609
    DOI: 10.1039/C5TC02134K

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