Stress-modulated optimization of polymorphic phase transition in Li-doped (K,Na)NbO3

Khansur NH, Martin A, Rieß K, Nishiyama H, Hatano K, Wang K, Li JF, Kakimoto KI, Webber KG (2020)

Publication Type: Journal article

Publication year: 2020

Journal

Book Volume: 117

Article Number: 032901

Journal Issue: 3

DOI: 10.1063/5.0016072

Abstract

The effect of uniaxial compressive stress on the crystal structure of a 6 mol. % Li-doped (K,Na)NbO3 (LKNN6a) ceramic was investigated using in situ synchrotron X-ray diffraction, revealing the stress-induced relative change in monoclinic Pm and tetragonal P4mm phases. As such, stress-induced phase transformations, in addition to the lattice deformation and domain switching, are the contributing factors for the observed macroscopic mechanical behavior of LKNN6a. The in situ stress-dependent diffraction data also demonstrates a method to mechanically modulate the polymorphic phase transition temperature (TPPT) to a higher temperature, as observed by the temperature-dependent permittivity measurements under a constant bias stress. The external uniaxial compressive stress increases the stability of the lower symmetry monoclinic phase, shifting TPPT to a higher temperature by 60 °C for the maximum uniaxial compressive stress of 300 MPa in the studied composition. Importantly, the stress-induced stabilization of the room-temperature ferroelectric phase can be useful to optimize the phase transition region, as well as increase the temperature stability of lead-free KNN.

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Additional Organisation(s)

Involved external institutions

Tsinghua University China (CN) Taiyo Yuden / 太陽誘電株式会社 Japan (JP) Nagoya Institute of Technology / 名古屋工業大学 Nagoya Kōgyō Daigaku Japan (JP)

How to cite

APA:

Khansur, N.H., Martin, A., Rieß, K., Nishiyama, H., Hatano, K., Wang, K.,... Webber, K.G. (2020). Stress-modulated optimization of polymorphic phase transition in Li-doped (K,Na)NbO3. Applied Physics Letters, 117(3). https://doi.org/10.1063/5.0016072

MLA:

Khansur, Neamul Hayet, et al. "Stress-modulated optimization of polymorphic phase transition in Li-doped (K,Na)NbO3." Applied Physics Letters 117.3 (2020).

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