| 摘要 |
1,203,973. Yttrium iron garnets. WESTERN ELECTRIC CO. Inc. 14 Nov., 1967 [15 Nov., 1966], No. 51783/67. Heading CIA. [Also in Divisions H1 and H4] Crystals of Y 3-x M<SP>1</SP> x Fe 5-y M<SP>11</SP> y O 12 garnet (where M<SP>1</SP> is a trivalent rare earth Nos. 57-71, M<SP>11</SP> is Ga and/or Al, x is 0-0À3, and y is 0-1.25) are grown by placing a seed crystal and a nutrient mass in a closed vessel in a 10-25 M solution of KOH in H 2 O or D 2 O, heating the solution to at least 350‹ C. while under a pressure exceeding the critical pressure, and maintaining a temperature difference between the seed and the mass of at least 5‹ C. The temperature is preferably 350-425‹ C., the pressure 8000-35000 psi, and the temperature difference 10-50‹ C. The seed crystal orientation may be (100), (211), (111) or (110). The nutrient mass may be a mixture of the oxides, which may be sintered, or crystals grown hydrothermally under maximum growth conditions. The vessel may be Pt lined and may be filled to 70-95% of its volume before heating. A baffle may be placed between the nutrient mass in the bottom of the vessel and the crystals suspended above, to maintain the temperature difference. |
