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We grew a Al 25% substituted Ca3NbGa3Si2O14, Ca3Nb(Ga0.75Al0.25)3Si2O14 (CNGAS) bulk single crystal with a diameter of 1 inch by Czochralski (Cz) method. Cracks in the crystal were dramatically decreased by the optimization of temperature gradient. Result of powder X-ray measurement indicated the grown CNGAS bulk single crystal was a single phase of langasite-type phase and lattice parameters, a-...
Ca3Nb(Ga1−xAlx)3Si2O14(CNGAS) 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 and the crystals with x = 0.8 and 1 included some secondary phases in addition to the langasite-type...
Ca3Nb(Ga1−xAlx)3Si2O14(CNGAS) 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 and the crystals with x = 0.8 and 1 included some secondary phases in addition to the langasite-type...
We grew Ca3NbGa3Si2O14 (CNGS) single crystals in Air, Ar+3%O2 and Ar atmosphere by the micro-pulling-down (μ-PD) method in order to clarify the origin of the crystal color. While the CNGS crystal grown in Air indicated orange color, the crystal grown in Ar was colorless. CNGS crystal grown in Air indicated several large absorption peaks around 360 and 500 nm in the transmittance spectrum. In contrast,...
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