Lead-free piezoelectric crystals grown by the micro-pulling down technique in the BaTiO3-CaTiO3-BaZrO3 system

Philippe Veber, Karol Bartosiewicz, Jerome Debray, Guillaume Alombert-Goget, Omar Benamara, Vincent Motto-Ros, Mai Pham Thi, Ana Borta-Boyon, Hugues Cabane, Kheirreddine Lebbou, Franck Levassort, Kei Kamada, Akira Yoshikawa, Mario Maglione

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

BaTiO3-based crystal fibres with mm-sized grains were grown by the micro-pulling down technique from the BaTiO3-CaTiO3-BaZrO3 solid solution with pulling velocities of about 6, 9 and 15 mm h-1. The natural growth direction was identified as (001)pc. For the pulling velocities of about 15 mm h-1 and 9 mm h-1, effective partition coefficients have been calculated from Castaing micro-probe measurements, and gave, respectively, 1.3 and 2 for Zr, and 0.95 and 0.9 for Ca. Laser-induced breakdown spectroscopy measurements reveal a strong inhomogeneity and variations of Zr contents while Ca contents show an opposite variation trend with a more steady distribution. Coexistence of two crystallized perovskite solid solutions is suggested. Most efficient polycrystals with mm-sized grains and 0.5 mol% Zr and 11 mol% Ca as average contents exhibit Curie temperatures higher than 113 °C, electromechanical coupling factors kt up to 41% and piezoelectric charge coefficients d33 up to 242 pC N-1 at room temperature. These values are similar to piezoelectric coefficients reported in the literature for oriented flux-grown single crystals with close compositions. Both chemical and physical results obtained in the BCTZ system make the μ-PD technique a promising way to improve the piezoelectric response of lead-free solid solution-based single crystals.

Original languageEnglish
Pages (from-to)3844-3853
Number of pages10
JournalCrystEngComm
Volume21
Issue number25
DOIs
Publication statusPublished - 2019

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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