Stress dependent impedance spectroscopy of niobium based ceramics

Tanaka H, Nozaki T, Martin A, Webber KG, Kakimoto KI (2023)

Publication Type: Journal article

Publication year: 2023

Journal

Japanese Journal of Applied Physics Japan Society of Applied Physics

Book Volume: 62

Article Number: SM1026

Journal Issue: SM

DOI: 10.35848/1347-4065/acedb8

Abstract

In this study, stress-dependent impedance spectra were characterized as a function of uniaxial compressive stress up to -300 MPa for Zr-doped (Na0.5K0.5)(Nb1−x/125Zrx/100)O3−δ (x = 5, 10 mol%). This allowed for the evaluation of the stress-induced changes in the grain and grain boundary capacitance. The grain capacitance from equivalent circuit fitting exhibited decreasing behavior with increasing uniaxial compressive stress increased, which is attributed to hindered domain wall movement reducing the extrinsic contributions. Interestingly, NKNZ10 showed a more significant degradation in grain capacitance than NKNZ5. One possible explanation is the difference in oxygen vacancies, and by extension defect dipoles, when introducing Zr into the lattice. As such, this study reveals the amplifying effect of oxygen vacancies to the mechanical suppression of domain wall movement.

Authors with CRIS profile

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

Nagoya Institute of Technology / 名古屋工業大学 Nagoya Kōgyō Daigaku

Japan (JP)

How to cite

APA:

Tanaka, H., Nozaki, T., Martin, A., Webber, K.G., & Kakimoto, K.I. (2023). Stress dependent impedance spectroscopy of niobium based ceramics. Japanese Journal of Applied Physics, 62(SM). https://doi.org/10.35848/1347-4065/acedb8

MLA:

Tanaka, Hideki, et al. "Stress dependent impedance spectroscopy of niobium based ceramics." Japanese Journal of Applied Physics 62.SM (2023).

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