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Influence of Ta5+ content on the crystallographic structure and electrical properties of [001]PCoriented (Li,Na,K)IJNb,Ta)O3 single crystals

Liu, Hairui and Veber, Philippe and Koruza, Jurij and Rytz, Daniel and Josse, Michael and Rödel, Jürgen and Maglione, Mario (2016):
Influence of Ta5+ content on the crystallographic structure and electrical properties of [001]PCoriented (Li,Na,K)IJNb,Ta)O3 single crystals.
In: CrystEngComm, RSC Publishing, pp. 2081-2088, 18, ISSN 1466-8033, [Article]

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 largesignal 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 (V'a-Vo) by defect dipoles, which were created during the crystal growth process.

Item Type: Article
Erschienen: 2016
Creators: Liu, Hairui and Veber, Philippe and Koruza, Jurij and Rytz, Daniel and Josse, Michael and Rödel, Jürgen and Maglione, Mario
Title: Influence of Ta5+ content on the crystallographic structure and electrical properties of [001]PCoriented (Li,Na,K)IJNb,Ta)O3 single crystals
Language: English
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 largesignal 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 (V'a-Vo) by defect dipoles, which were created during the crystal growth process.

Journal or Publication Title: CrystEngComm
Volume: 18
Publisher: RSC Publishing
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
Date Deposited: 23 Mar 2016 13:01
Identification Number: doi:10.1039/c5ce02581h
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