Influence of Ta5+ content on the crystallographic structure and electrical properties of [001]PC-oriented (Li,Na,K)(Nb,Ta)O3 single crystals

Hairui Liu, Philippe Veber, Jurij Koruza, Daniel Rytz, Michael Josse, Jürgen Rödel, Mario Maglione

Research output: Contribution to journalArticle

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Abstract

A series of centimeter-sized lead-free piezoelectric Li+- and Ta5+-modified (Na,K)NbO3 single crystals with an ABO3 perovskite structure was successfully grown by the top-seeded solution growth method. Effective segregation of the elements was considered in order to further develop the growth of Li+- and Ta5+-modified (Na,K)NbO3 single crystals. The crystallographic structure and electrical behaviour along the [001]PC orientation were studied. X-ray diffraction, Raman spectroscopy and dielectric studies reveal that the increase in Ta5+ content reduces the orthorhombic-tetragonal phase transition. Bipolar and unipolar strain curves were investigated at 2 kV mm-1. The highest bipolar and unipolar strains associated with a large-signal piezoelectric constant of 368 pm V-1 were achieved for Li0.02Na0.626K0.354Nb0.808Ta0.192O3. The asymmetric bipolar strain curves were observed and related to the existence of internal bias fields induced by (V′A-VO) defect dipoles, which were created during the crystal growth process.

Original languageEnglish (US)
Pages (from-to)2081-2088
Number of pages8
JournalCrystEngComm
Volume18
Issue number12
DOIs
StatePublished - Jan 1 2016

All Science Journal Classification (ASJC) codes

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

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