| 摘要 |
PURPOSE:To obtain a dense and straight sintered rod at comparatively low temp. in a short time by controlling the heating speed of the press-formed body of a powdery raw material at specified speed in the case of producing the sintered rod for a raw material by which LnMgAl11O19 single crystal is grown by a band melting method. CONSTITUTION:A sintered rod for a raw material is produced which is used in the case of growing LnMgAl11O19 single crystal (Ln shows each lanthanoid element of La, Ce, Pr, Nd, Sm, Eu, Gd and solid solution thereof) by a band melting method. Therefor the rodlike press-formed body M of a powdery raw material is hung by a wire 2 made of platinum or platinum-rhodium alloy and held in an electric furnace 1. Thereafter this rodlike press-formed body M is heated at the rate of temp. rise of 20-50 deg.C/min and held at 1550-1700 deg.C. Otherwise the press-formed body M is inserted into the electric furnace 1 held at 1550-1700 deg.C from the upper part thereof at the speed of 0.1-2cm/min. |
