The influence of uniaxial compressive stress on small-signal relative permittivity and direct piezoelectric coefficient of polycrystalline Li-modified (K0.5Na0.5)NbO3 (0, 2, and 4 mol. % Li) was characterized as a function of temperature from 25 to 450 °C. These data reveal corresponding anomalies in both the dielectric and piezoelectric properties near the well-known structural phase transitions in (KxNa1 − x)NbO3. In particular, increasing stress was found to shift the orthorhombic–tetragonal () and tetragonal–cubic () phase boundaries to higher temperatures, thereby stabilizing the lower symmetry phases. Experimental results also show that stress up to a critical value flattens the piezoelectric response below , above which a monotonic decrease is observed. In contrast, permittivity is increased below with increasing stress. These results are used to construct a stress–temperature phase diagram of Li-modified (K0.5Na0.5)NbO3.
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21 March 2020
Research Article|
March 16 2020
High temperature piezoelectric response of polycrystalline Li-doped (K,Na)NbO3 ceramics under compressive stress Available to Purchase
Alexander Martin
;
Alexander Martin
a)
1
Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
, Martensstraße 5, 91058 Erlangen, Germany
a)Author to whom correspondence should be addressed: [email protected]
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Neamul H. Khansur
;
Neamul H. Khansur
1
Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
, Martensstraße 5, 91058 Erlangen, Germany
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Udo Eckstein
;
Udo Eckstein
1
Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
, Martensstraße 5, 91058 Erlangen, Germany
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Kevin Riess
;
Kevin Riess
1
Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
, Martensstraße 5, 91058 Erlangen, Germany
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Ken-ichi Kakimoto
;
Ken-ichi Kakimoto
2
Frontier Research Institute for Materials Science, Nagoya Institute of Technology
, Nagoya 466-8555, Japan
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Kyle G. Webber
Kyle G. Webber
1
Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
, Martensstraße 5, 91058 Erlangen, Germany
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Alexander Martin
1,a)
Neamul H. Khansur
1
Udo Eckstein
1
Kevin Riess
1
Ken-ichi Kakimoto
2
Kyle G. Webber
1
1
Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
, Martensstraße 5, 91058 Erlangen, Germany
2
Frontier Research Institute for Materials Science, Nagoya Institute of Technology
, Nagoya 466-8555, Japan
a)Author to whom correspondence should be addressed: [email protected]
J. Appl. Phys. 127, 114101 (2020)
Article history
Received:
November 04 2019
Accepted:
February 22 2020
Citation
Alexander Martin, Neamul H. Khansur, Udo Eckstein, Kevin Riess, Ken-ichi Kakimoto, Kyle G. Webber; High temperature piezoelectric response of polycrystalline Li-doped (K,Na)NbO3 ceramics under compressive stress. J. Appl. Phys. 21 March 2020; 127 (11): 114101. https://doi.org/10.1063/1.5134554
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