Deterioration of the piezoelectric properties of (Bi0.5Na0.5)TiO3 when using Na2CO3 as a sintering aid: A crystallographic and microstructural study

Tadhg Mahon*, Dimosthenis Giannopoulos, Sybrand van der Zwaag, Pim Groen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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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.

Original languageEnglish
Article number134102
Number of pages10
JournalJournal of Applied Physics
Volume129
Issue number13
DOIs
Publication statusPublished - 2021

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