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High-performance piezoelectric (K,Na,Li)(Nb,Ta,Sb)O3 single crystals by oxygen annealing

Liu, Hairui and Veber, Philippe and Rödel, Jürgen and Rytz, Daniel and Fabritchnyi, Pavel B. and Afanasov, Mikhail I. and Patterson, Eric A. and Frömling, Till and Maglione, Mario and Koruza, Jurij (2018):
High-performance piezoelectric (K,Na,Li)(Nb,Ta,Sb)O3 single crystals by oxygen annealing.
In: Acta Materialia, Elsevier, pp. 499-507, 148, ISSN 13596454,
DOI: 10.1016/j.actamat.2018.02.026,
[Article]

Abstract

Ferroelectric single crystals exhibit the largest known piezoelectric constants and therefore show high potential for application in electronic devices, including sensors, actuators, and transducers. Their large properties, however, can only be fully exploited if the behavior is not influenced by lattice defects, formed during high-temperature processing. Such defects can inhibit domain-wall movement, increase leakage currents, and are predominantly responsible for the poor performance of the emerging ferroelectric crystals. Here, an approach to considerably enhance the piezoelectric and ferroelectric properties of (K,Na,Li)(Nb,Ta,Sb)O3 crystals by oxygen annealing is investigated. As compared to the non-annealed crystals, polarization, strain, and piezoelectric constant of the annealed sample were enhanced by a factor of two, resulting in an outstanding room-temperature value of piezoelectric constant d33=732 pC/N and a peak value of d33=1431 pm/V at the orthorhombic-tetragonal transition. The behavior was analyzed using electromechanical measurements, M€ossbauer spectroscopy, and impedance spectroscopy, revealing decreased concentrations of both oxygen vacancies and Sb3þ ions after annealing. The findings indicate that the control of the defect chemistry enables these ferroelectric (K,Na)NbO3-based single crystals to outperform their polycrystalline counterparts and reach the values of lead-containing compositions. Moreover, the present strategy enables further detailed studies of the inherent crystal anisotropy and the possibilities for domain engineering.

Item Type: Article
Erschienen: 2018
Creators: Liu, Hairui and Veber, Philippe and Rödel, Jürgen and Rytz, Daniel and Fabritchnyi, Pavel B. and Afanasov, Mikhail I. and Patterson, Eric A. and Frömling, Till and Maglione, Mario and Koruza, Jurij
Title: High-performance piezoelectric (K,Na,Li)(Nb,Ta,Sb)O3 single crystals by oxygen annealing
Language: English
Abstract:

Ferroelectric single crystals exhibit the largest known piezoelectric constants and therefore show high potential for application in electronic devices, including sensors, actuators, and transducers. Their large properties, however, can only be fully exploited if the behavior is not influenced by lattice defects, formed during high-temperature processing. Such defects can inhibit domain-wall movement, increase leakage currents, and are predominantly responsible for the poor performance of the emerging ferroelectric crystals. Here, an approach to considerably enhance the piezoelectric and ferroelectric properties of (K,Na,Li)(Nb,Ta,Sb)O3 crystals by oxygen annealing is investigated. As compared to the non-annealed crystals, polarization, strain, and piezoelectric constant of the annealed sample were enhanced by a factor of two, resulting in an outstanding room-temperature value of piezoelectric constant d33=732 pC/N and a peak value of d33=1431 pm/V at the orthorhombic-tetragonal transition. The behavior was analyzed using electromechanical measurements, M€ossbauer spectroscopy, and impedance spectroscopy, revealing decreased concentrations of both oxygen vacancies and Sb3þ ions after annealing. The findings indicate that the control of the defect chemistry enables these ferroelectric (K,Na)NbO3-based single crystals to outperform their polycrystalline counterparts and reach the values of lead-containing compositions. Moreover, the present strategy enables further detailed studies of the inherent crystal anisotropy and the possibilities for domain engineering.

Journal or Publication Title: Acta Materialia
Volume: 148
Publisher: Elsevier
Uncontrolled Keywords: Single crystals Defects Piezoelectricity Ferroelectricity Mössbauer spectroscopy
Divisions: 11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences
Date Deposited: 02 Mar 2018 13:55
DOI: 10.1016/j.actamat.2018.02.026
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