Gas bubble associated mass transport in Bridgman-Stockbarger melt growth system
✍ Scribed by A. G. Petrosyan
- Publisher
- John Wiley and Sons
- Year
- 1983
- Tongue
- English
- Weight
- 551 KB
- Volume
- 18
- Category
- Article
- ISSN
- 0232-1300
No coin nor oath required. For personal study only.
✦ Synopsis
Experimental evidence has been obtained showing that gas bubbles may be responsible for melt stirring in Bridgman-Stockharger growth system which results in Pfann type impurity distribution profiles along the crystal length. The hypothesis of the gas bubble associated mass transfer mechanism is supported by the production of Y3Al,0,,-Nd3+ single crystals under conditions which eliminate or limit gas bubble nucleation in the melts with Nd3+ distribution profiles similar to those generally observed in melt growth systems where the mass transport in the melts is limited t o diffusion. B p a 6 o ~e npeAcTasneHb1 ~K C I I ~P H M ~H T ~J I L H L I ~ HaHHbIe, no~a3~1~a~o11pie wo nepeivemmame pacnnasa B cHcTeMe F p ~n ~~e ~a -C ~o ~G a p r e p a MoxceT 6HTb o6ycnomeHo npeneneaeme npniveceii, OnHcbIBaeMoe ypaBHemeM IQaHHa. IIpennonomeHne o ra30BbIMH Ily3bIpaMH, CJIeHCTBLleM gerO RBJIReTCH Ha6JIEoHaeMOe B RpllCTaJIJIaX PaC-MeXaHH3Me IlepeHOCa MaCCbI, 06yCnOBJIeHHOM ra30BLIMM IlY3bIPIIMH, nOHKpenJIfleTCfl IlOJIy' leHHeM MOHOKpHCTaJIJIOB Y,AI,0,,-Nd3+ B yCJIOBHIIX orpaHE14HBaEo~Hx 3aposK~e~He spacnnasax ra30~b1x ny31spe$i c pacnpeHenemeM MOHOB Nd3' 6 n a 3 1 c ~~ K pacnpeneneamo O ~L I Y H O HannmHaeivoMy B CncTeMax, rae nepeHoc Maccbi B pacnaase orpaHnseH n ~@ @ ya ~e i i .