to icp aes the formula of single crystal is bab 2 y o 4 u2014 al y in which y is 0 04 600 g of barium carbonate 414 g of boric acid 50 1 g of gallium nitrate with one crystal water 63 8 g of sodium fluoride and 26 7 g of barium fluoride are grinded and mixed melted many times and poured into platinum crucible first overheated to 970 u00b0 c kept temperature for 30 days then cooled to 940 u00b0 c and seed rod with seed crystal is slowly put in keeping temperature 0 5 hour and cooling to 930 u00b0 c then single crystal begins to grow seed rod rotates with 16 rpm at the same time beginning to cool slowly with the rate of 0 8 u00b0 c per day stopping rotating on the 28th day and growing statically and continuing to cool with the same rate stopped heating when growing time of single crystal up to 110 days single crystal is took away from melt surface and slowly cooled to room temperature and took out and the bbsag with u03c673 u00d7 15 mm is obtained according to icp aes the formula of single crystal is bab 2 z o 4 u2014 ga z in which z is 0.