Crystal growth of Ca3Nb(Ga1-xAlx)3Si2O14 piezoelectric single crystals with various al concentrations

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Abstract

Ca3Nb(Ga1-xAlx)3Si2O14 (CNGAS) single crystals with various Al concentrations were grown by a micro-pulling-down (μ-PD) method and their crystal structures, chemical compositions, crystallinities were investigated. CNGAS crystals with x = 0.2, 0.4 and 0.6 indicated a single phase of langasite-type structure without any secondary phases. In contrast, the crystals with x = 0.8 and 1 included some secondary phases in addition to the langasite-type phase. Lattice parameters, a- and c-axes lengths, of the langasite-type phase systematically decreased with an increase of Al concentration. The results of chemical composition analysis revealed that the actual Al concentrations in as-grown crystals were almost consistent with the nominal compositions. In addition, there was no large segregation of each cation along the growth direction.

Original languageEnglish
Pages (from-to)5597-5605
Number of pages9
JournalMaterials
Volume8
Issue number9
DOIs
Publication statusPublished - 2015 Jan 1

Keywords

  • Langasite
  • Micro-pulling-down method
  • Piezoelectric crystal
  • Single crystal

ASJC Scopus subject areas

  • Materials Science(all)

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