Effect of A-site non-stoichiometry in NaNbO3 ceramics

Hussain A, Gadelmawla A, Maier J, Eyoum G, Miyazaki H, Kimura K, Hayashi K, Webber KG (2025)

Publication Type: Journal article

Publication year: 2025

Journal

Book Volume: 255

Article Number: 116384

DOI: 10.1016/j.scriptamat.2024.116384

Abstract

NaNbO3 (NN) is a potentially promising material for energy storage and conversion. Understanding the structure-property relationships of NN is crucial for its precise development and implementation in various devices. This work reports the effect of Na non-stoichiometry on structure and ferroelectric properties of polycrystalline NN ceramics. Slight deviations of Na content in NN were observed to create large variations in microstructure, such as grain morphology and reduction in grain size. An insignificant phase change is observed in x-ray diffraction analysis; however, the pair distribution function (PDF) results show a nonuniform atomic displacement which are not directly observed by standard crystallographic techniques. A small amount of Na excess (2 mol.%) in NN enhanced the dielectric constant, polarization, and strain response, whereas a deficiency of same amount degrades electromechanical performance. This work not only explores Na non-stoichiometric effect in NN, but also provides a pathway for development of high performance NN-based ceramics.

Authors with CRIS profile

Involved external institutions

Institute of Space Technology (IST) Pakistan (PK) Nagoya Institute of Technology / 名古屋工業大学 Nagoya Kōgyō Daigaku Japan (JP)

How to cite

APA:

Hussain, A., Gadelmawla, A., Maier, J., Eyoum, G., Miyazaki, H., Kimura, K.,... Webber, K.G. (2025). Effect of A-site non-stoichiometry in NaNbO3 ceramics. Scripta Materialia, 255. https://doi.org/10.1016/j.scriptamat.2024.116384

MLA:

Hussain, Ali, et al. "Effect of A-site non-stoichiometry in NaNbO3 ceramics." Scripta Materialia 255 (2025).

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