Structural dependence of the piezoelectric properties of KNbO3 nanowires synthesized by the hydrothermal method

Title
Structural dependence of the piezoelectric properties of KNbO3 nanowires synthesized by the hydrothermal method
Authors
Mi-Ri JoungIn-Tae SeoJin-Seong KimHaiBo XuGuifang Han강민규강종윤윤석진남산
Keywords
Piezoelectricity; Nanowire; Perovskites; Synthesis
Issue Date
2013-06
Publisher
Acta materialia
Citation
VOL 61, NO 10, 3703-3708
Abstract
Because of the presence of OH− and H2O in the KN unit cell, tetragonal KNbO3 (KN) nanowires were formed when the synthesis was carried out at 120 °C for 48 h. However, when the fabrication was conducted at high temperatures (≥150 °C) or at 120 °C for a long period of time (≥72 h), orthorhombic KN nanowires were formed. Moreover, the KN nanowires synthesized at 120 °C for 60 h showed a morphotropic phase boundary (MPB) structure in which both tetragonal and orthorhombic structures coexisted. Tetragonal, orthorhombic and MPB KN nanowires were also grown on the Nb5+-doped SrTiO3 substrate, and their d33 values were measured for the first time. A tetragonal KN nanowire exhibited a d33 value of 23.5 pm V−1, which is larger than that of the orthorhombic KN nanowire (11.6 pm V−1), probably because of the softening effect of the metal vacancies. The MPB KN nanowires exhibited a larger d33 value of 40.0 pm V−1. The d33 values of KN nanowires increased to 104.5, 137.1 and 146.0 pm V−1 for the orthorhombic, tetragonal and MPB KN nanowires, respectively, after the KN nanowires were poled along the [1 0 0] direction by application of a DC voltage of 10 V.
URI
http://pubs.kist.re.kr/handle/201004/45203
ISSN
13596454
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KIST Publication > Article
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