Temperature- and stress-dependent electromechanical properties of phase-boundary-engineered KNN-based piezoceramics

Gadelmawla A, Eckstein U, Rieß K, Liu YX, Wang K, Li JF, Kakimoto KI, Khansur NH, Webber KG (2022)

Publication Type: Journal article

Publication year: 2022

Journal

Journal of the American Ceramic Society Wiley-Blackwell

DOI: 10.1111/jace.18917

Abstract

The influence of stress on the small-signal dielectric permittivity and piezoelectric coefficient of polycrystalline lead-free perovskite 0.92(Na1/2K1/2)NbO3-(0.08 - x)Bi1/2Li1/2TiO3-xBaZrO(3) (x = 0, 0.02, 0.04, 0.06, and 0.07) was characterized under different constant uniaxial stress up to -200 MPa within a temperature range of -150 to 450 degrees C, revealing stress-induced suppression of the electromechanical response as well as shifts in the phase boundaries. For all compositions, the interferroelectric and ferroelectric-paraelectric phase transitions were shifted to higher temperatures under the uniaxial compressive stress. Interestingly, the sensitivity to the applied stress was found to increase with increasing BZ/BLT ratio in the system. The origin of a different extent of stress-sensitivity with BZ/BLT ratio is suggested to be related to the change in the crystal structure. Additionally, at temperatures below -50 degrees C, the relative permittivity showed a significant increase under applied compressive stress.

Authors with CRIS profile

Ahmed Gadelmawla Lehrstuhl für Glas und Keramik (WW3) Udo Eckstein Lehrstuhl für Glas und Keramik (WW3) Kevin Rieß Professur für Werkstoffwissenschaften (Funktionskeramik) Neamul Hayet Khansur Lehrstuhl für Glas und Keramik (WW3) Kyle Grant Webber Professur für Werkstoffwissenschaften (Funktionskeramik)

Additional Organisation(s)

Graduiertenkolleg 2495/2 Energiekonvertierungssysteme: von Materialien zu Bauteilen (Energy Conversion Systems: From Materials to Devices)

Involved external institutions

Tsinghua University CN China (CN) Nagoya Institute of Technology / 名古屋工業大学 Nagoya Kōgyō Daigaku JP Japan (JP)

How to cite

APA:

Gadelmawla, A., Eckstein, U., Rieß, K., Liu, Y.-X., Wang, K., Li, J.-F.,... Webber, K.G. (2022). Temperature- and stress-dependent electromechanical properties of phase-boundary-engineered KNN-based piezoceramics. Journal of the American Ceramic Society. https://doi.org/10.1111/jace.18917

MLA:

Gadelmawla, Ahmed, et al. "Temperature- and stress-dependent electromechanical properties of phase-boundary-engineered KNN-based piezoceramics." Journal of the American Ceramic Society (2022).

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