Deterioration of the piezoelectric properties of (Bi0.5Na0.5)TiO3 when using Na2CO3 as a sintering aid

A crystallographic and microstructural study

Journal article (2021)

Authors

T.R. Mahon Novel Aerospace Materials - Aerospace Engineering
D. Giannopoulos Novel Aerospace Materials - Aerospace Engineering
S. van der Zwaag Novel Aerospace Materials - Aerospace Engineering
W.A. Groen Aerospace Structures & Materials , Novel Aerospace Materials - Aerospace Engineering
Research Group
Novel Aerospace Materials (Aerospace Engineering) (TU Delft)
Copyright: © 2021 T.R. Mahon, D. Giannopoulos, S. van der Zwaag, W.A. Groen
DOI: https://doi.org/10.1063/5.0044636
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Published Date

2021

Language

English

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Faculty

Aerospace Engineering

Department

Aerospace Structures & Materials

Research Group

Novel Aerospace Materials

Abstract

In this work, we present the impact of using Na2CO3 as a sintering aid and grain growth agent on the crystal structure, microstructure, and piezoelectric properties of (Bi0.5Na0.5)TiO3 ceramics. The addition of Na2CO3 leads to a substantial increase in the grain size and density even at a reduced sintering temperature of 1025 °C. However, at the same time, the value of the piezoelectric constant d33 drops dramatically. Using high-resolution x-ray diffraction analysis, we demonstrate that the decrease in piezoelectric constant is due to a change in the chemical composition of the (Bi0.5Na0.5)TiO3 base material rather than due to the change in the grain size. High Na2CO3-addition levels lead to the formation of Bi2O3 as a secondary phase during sintering too.

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