In situ combined stress- and temperature-dependent Raman spectroscopy of Li-doped (Na,K)NbO3

Khansur NH, Eckstein U, Bergler M, Martin A, Wang K, Li JF, Cicconi MR, Hatano K, Kakimoto KI, de Ligny D, Webber KG (2021)

Publication Type: Journal article

Publication year: 2021

Journal

Journal of the American Ceramic Society Wiley-Blackwell

DOI: 10.1111/jace.18269

Abstract

External thermal, electrical, and mechanical fields can induce structural phase transitions in lead-free Li-modified Na0.5K0.5NbO3 ferroelectrics, which significantly influence the macroscopic electromechanical response. In particular, the relative stability of the polar monoclinic (or orthorhombic) and tetragonal phases under temperature and stress is critical to realize the ferroelectric and piezoelectric response. In this study, the effect of mechanical and thermal fields on the local structure in the vicinity of the monoclinic-tetragonal (M-T) phase boundary was investigated using a novel in situ combined uniaxial compressive stress- and temperature-dependent Raman spectroscopy experimental arrangement. Experiments were performed up to 300 degrees C and -200 MPa, clearly demonstrating stress-induced M-T phase transition in Li-modified Na0.5K0.5NbO3. A stress-temperature phase diagram has been established based on the change in vibrational modes. It was possible to correlate the relative permittivity singularities previously observed to a given stage of the M-T phase transition using ratio between characteristic Raman band areas. In addition, the measurement method reported here can be applied to other functional ceramics to investigate the influence of mechanical fields on local structure.

Authors with CRIS profile

Neamul Hayet Khansur Lehrstuhl für Glas und Keramik Udo Eckstein Lehrstuhl für Glas und Keramik Michael Bergler Professur für Werkstoffwissenschaften (Glas und Keramik) Alexander Martin Lehrstuhl für Glas und Keramik Maria Rita Cicconi Lehrstuhl für Glas und Keramik Dominique de Ligny Professur für Werkstoffwissenschaften (Glas und Keramik) Kyle Grant Webber Professur für Werkstoffwissenschaften (Funktionskeramik)

Additional Organisation(s)

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

Related research project(s)

Formulation and Crystallization of Perovskite Bearing Glass-Ceramics for Light Management (Project G IGK 2495) IGK 2495: Energy Conversion Systems: From Materials to Devices (IGK 2495) Jan. 1, 2020 - June 30, 2024

Involved external institutions

Taiyo Yuden / 太陽誘電株式会社 JP Japan (JP) 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:

Khansur, N.H., Eckstein, U., Bergler, M., Martin, A., Wang, K., Li, J.-F.,... Webber, K.G. (2021). In situ combined stress- and temperature-dependent Raman spectroscopy of Li-doped (Na,K)NbO3. Journal of the American Ceramic Society. https://doi.org/10.1111/jace.18269

MLA:

Khansur, Neamul Hayet, et al. "In situ combined stress- and temperature-dependent Raman spectroscopy of Li-doped (Na,K)NbO3." Journal of the American Ceramic Society (2021).

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