Single-crystal growth of langasite (La3Ga5SiO14) by the vertical Bridgman (VB) method in air and in an Ar atmosphere

Single crystal growth of langataite (La3Ta0.5Ga5.5O14) by vertical Bridgman (VB) method along [21¯1¯0] in air and in an Ar atmosphere

“…The crystal was cooled to room temperature for 16 h after the end of crystal growth, and the platinum crucible was peeled off and removed from the crystal. The growth apparatus and detailed growth conditions have been reported previously [7]. The crystallized phases around the grown crystal were evaluated by powder X-ray diffraction (XRD) and electron probe microanalysis (EPMA) using JXA-8621MX (JEOL).…”

“…The experimental results showed that a slightly Ga-rich composition, in which the ratio of Ga 2 O 3 was 0.2 mol% higher than that of the stoichiometric one, may be optimal as a raw material [6]. Using such raw material, a colorless and transparent LGS crystal 1 in in diameter was successfully grown by the VB method in an Ar atmosphere without any other phase crystallization [7]. Higher resistivity was also obtained for the VB-LGS crystal grown in an Ar atmosphere than for that grown in air [7].…”

“…Using such raw material, a colorless and transparent LGS crystal 1 in in diameter was successfully grown by the VB method in an Ar atmosphere without any other phase crystallization [7]. Higher resistivity was also obtained for the VB-LGS crystal grown in an Ar atmosphere than for that grown in air [7].…”

Luminescence of Eu-doped langanite nanopowders synthesized by a citrate sol–gel method

“…the reddish coloration of the samples is intensified with the annealing temperature). The red coloration of the crystals from the langasite family is related to point defects involving oxygen [14][15][16].…”

Growth of potassium tantalate (KTaO3) crystals by directional solidification

“…After the raw materials had melted completely, the crucible was pulled down at a rate of 0.5 mm/h, and the crystals were grown by directional solidification in air. The growth apparatus and detailed growth conditions have been reported previously [10]. The crystal was cooled to room temperature for 16 hours after the completion of the crystal growth, and the platinum crucible was peeled away and removed from the crystal.…”