| 摘要 |
PROBLEM TO BE SOLVED: To readily produce a large crystal of layered crystal structure oxide. SOLUTION: Bi2 O3 used as a flux, SrCO3 and Ta2 O5 are mixed to afford a raw material M and the raw material M is charged to a crucible. The crucible is inserted into a heating furnace 20 and the raw material M is heated at a melting point or above (e.g. >=1,350 deg.C and <=1,500 deg.C) of the raw material for a prescribed time to completely melt the raw material M (in a first heating step). Then, the raw material M is heated at a temperature lower than the melting point (e.g. >=1,000 deg.C and <=1,300 deg.C) for a prescribed time to vaporize the raw material M (in a second heating step). The heating furnace 20 has a temperature gradient in the vertical direction and a temperature of upper side wall 11a of the crucible 10 is lower than a heating temperature of raw material M. Thereby, crystal of layered crystal structure oxide [(Bi2 Sr1 Ta2 O9 ) as a stoichiometric composition formula] comprising Bi, Sr, Ta and O is deposited on the upper side wall of the crucible 10. |
