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Issue 12, 2016
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Influence of Ta5+ content on the crystallographic structure and electrical properties of [001]PC-oriented (Li,Na,K)(Nb,Ta)O3 single crystals

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Abstract

A series of centimeter-sized lead-free piezoelectric Li+- and Ta5+-modified (Na,K)NbO3 single crystals with an ABO3 perovskite structure was successfully grown by the top-seeded solution growth method. Effective segregation of the elements was considered in order to further develop the growth of Li+- and Ta5+-modified (Na,K)NbO3 single crystals. The crystallographic structure and electrical behaviour along the [001]PC orientation were studied. X-ray diffraction, Raman spectroscopy and dielectric studies reveal that the increase in Ta5+ content reduces the orthorhombic–tetragonal phase transition. Bipolar and unipolar strain curves were investigated at 2 kV mm−1. The highest bipolar and unipolar strains associated with a large-signal piezoelectric constant of 368 pm V−1 were achieved for Li0.02Na0.626K0.354Nb0.808Ta0.192O3. The asymmetric bipolar strain curves were observed and related to the existence of internal bias fields induced by Image ID:c5ce02581h-t1.gif defect dipoles, which were created during the crystal growth process.

Graphical abstract: Influence of Ta5+ content on the crystallographic structure and electrical properties of [001]PC-oriented (Li,Na,K)(Nb,Ta)O3 single crystals

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Publication details

The article was received on 29 Dec 2015, accepted on 12 Feb 2016 and first published on 12 Feb 2016


Article type: Paper
DOI: 10.1039/C5CE02581H
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CrystEngComm, 2016,18, 2081-2088
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    Influence of Ta5+ content on the crystallographic structure and electrical properties of [001]PC-oriented (Li,Na,K)(Nb,Ta)O3 single crystals

    H. Liu, P. Veber, J. Koruza, D. Rytz, M. Josse, J. Rödel and M. Maglione, CrystEngComm, 2016, 18, 2081
    DOI: 10.1039/C5CE02581H

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