Effect of varying Bi content on the temperature-dependent mechanical, dielectric, and structural properties of nominal Na1/2Bi1/2TiO3

Gadelmawla A, Rieß K, Birkenstock J, Hinterstein M, Webber KG, Khansur NH (2021)

Publication Type: Journal article

Publication year: 2021

Journal

Journal of Applied Physics AIP Publishing

Book Volume: 130

Article Number: 185106

Journal Issue: 18

DOI: 10.1063/5.0070594

Abstract

Na1/2Bi1/2TiO3 (NBT) with varying Bi content has gained significant interest as a potential new material for solid-oxide fuel cells and oxygen separation membranes because of its excellent oxygen-ion conductivity. In this work, the effect of varying Bi content in NBT ceramics of compositions Na1/2BixTiO2.25+1.5x, where x = 0.485-0.510, on the temperature-dependent mechanical and dielectric properties and the crystal structure has been investigated, as these applications expose the components to high thermal and mechanical fields. The effects of Bi variation on phase compositions and structural transitions were systematically investigated by scanning electron microscopy-energy dispersive x-ray analyses and neutron diffraction at room temperature, in situ high-temperature x-ray diffraction, dielectric permittivity, and mechanical measurements. In-depth analysis of the temperature-dependent data shows that the Bi content of the samples does not alter the average crystal structure of the NBT; however, the temperature-dependent behavior of the latter depend on variations in Bi content and the associated oxygen vacancy concentration. This change in phase transition temperature displays a good correlation with the temperature-dependent ferroelastic response and with the Bi content.

Authors with CRIS profile

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

Additional Organisation(s)

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

Involved external institutions

Universität Bremen DE Germany (DE) Karlsruhe Institute of Technology (KIT) DE Germany (DE)

How to cite

APA:

Gadelmawla, A., Rieß, K., Birkenstock, J., Hinterstein, M., Webber, K.G., & Khansur, N.H. (2021). Effect of varying Bi content on the temperature-dependent mechanical, dielectric, and structural properties of nominal Na1/2Bi1/2TiO3. Journal of Applied Physics, 130(18). https://dx.doi.org/10.1063/5.0070594

MLA:

Gadelmawla, Ahmed, et al. "Effect of varying Bi content on the temperature-dependent mechanical, dielectric, and structural properties of nominal Na1/2Bi1/2TiO3." Journal of Applied Physics 130.18 (2021).

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