気相法による酸化錫結晶の成長
1976 年 84 巻 967 号 p. 147-151
詳細
1976 年 84 巻 967 号 p. 147-151
The SnO2 crystals were grown by the following procedure: SnO2 powder mixed with Sn powder of 20-50mol% was placed in a mullite porcelain boat and this boat was placed in a mullite reaction tube heated at a temperature of 1050°C-1350°C in a horizontal tubular electric furnace, and N2 containing 1-20vol% O2 was flowed through the reaction tube continuously with a rate of 50ml/min during the growth run.
The growth rate of the SnO2 crystals was measured by means of telephotography through the viewing window laid at the end of the reaction tube.
The suitable Sn powder content, heating temperature and O2 content for the growth of the SnO2 crystals were 40mol%, 1200°C and 6-8vol%, respectively. The SnO2 crystals which were colorless and transparent, grew up to about 4.7cm in length and 80μ in width. The long axis and the a-axis of the crystal were the same. In the case of O2 content above 10vol%, SnO2 ribbon crystals also grew. The direction of thickness of the ribbon agreed with the c-axis of the crystal.
In the case of 40mol% Sn powder and 6 or 10vol% O2, the growth rate of the SnO2 crystals at 1200°C was 8.4-6.0 or 5.4-4.2mm/min, respectively.
