Coexistence of three ferroelectric phases and enhanced piezoelectric properties in BaTiO3–CaHfO3lead-free ceramics

Yang Yang, Yibei Zhou, Juan Ren, Qiaoji Zheng, Kwok Ho Lam, Dunmin Lin

Research output: Journal article publicationJournal articleAcademic researchpeer-review

20 Citations (Scopus)

Abstract

Perovskite ferroelectrics possess the fascinating piezoelectric properties near a morphotropic phase boundary, attributing to a low energy barrier that the results in structural instability and easy polarization rotation. In this work, a new lead-free system of (1-x)BaTiO 3-xCaHfO 3 was designed, and characterized by a coexistence of ferroelectric rhombohedral-orthorhombic-tetragonal (R-O-T) phases. With the increase amount of CaHfO 3 (x), a stable coexistence region of three ferroelectric phases (R-O-T) exists at 0.06 ≤ x ≤ 0.08. Both large piezoelectric coefficient (d 33∼400 pC/N), inverse piezoelectric coefficient (d 33 *∼547 pm/V) and planar electromechanical coupling factor (k p∼58.2%) can be achieved for the composition with x = 0.08 near the coexistence of three ferroelectric phases. Our results show that the materials with the composition located at a region where the three ferroelectric R-O-T phases coexist would have the lowest energy barrier and thus greatly promote the polarization rotation, resulting in a strong piezoelectric response.

Original languageEnglish
Pages (from-to)557-566
Number of pages10
JournalJournal of the European Ceramic Society
Volume38
Issue number2
DOIs
Publication statusPublished - 1 Feb 2018

Keywords

  • Barium titanate
  • Coexistence of three ferroelectric phases
  • Phase transition
  • Piezoelectric properties

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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