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Crystal Growth of Ca₃Nb(Ga1-xAlx)₃Si₂O14 Piezoelectric Single Crystals with Various Al Concentrations.


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.

SUBMITTER: Yokota Y 

PROVIDER: S-EPMC5512616 | biostudies-other | 2015 Aug

REPOSITORIES: biostudies-other

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