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The effect of platinum and excess 211 phase on the loss of the liquid phase in melt textured YBa/sub 2/Cu/sub 3/O/sub 7-x/
1999 / IEEE
This item was taken from the IEEE Periodical ' The effect of platinum and excess 211 phase on the loss of the liquid phase in melt textured YBa/sub 2/Cu/sub 3/O/sub 7-x/ ' Platinum is an important additive in YBa/sub 2/Cu/sub 3/O/sub 7-x/  powders for melt processing and growth of large oriented crystals, but its role in liquid loss during the growth cycle is poorly understood. A series of experiments were conducted to determine how platinum effects liquid loss, and to study the solubility limit of platinum in 123. Both atomically mixed and solid state platinum sources were compared. Crystals were grown on a nonreactive setter so that liquid loss could be clearly distinguished by weight from reaction products with the setter. Based on weight loss studies there was little difference between atomically added platinum and by adding platinum powder to the 123 powder. In samples with no excess Y/sub 2/BaCuO/sub 5/ (211), weight loss due to liquid loss was at a minimum of 3.8 percent with 0.3 weight percent platinum content. Examination with an electron microprobe reveals different microstructures for the two different methods of platinum additions.
Crystal Growth From Melt
Electron Probe Analysis
Y/sub 2/bacuo/sub 5/
Excess Y/sub 2/bacuo/sub 5/
Excess 211 Phase
Yba/sub 2/cu/sub 3/o/sub 7-x/
Large Oriented Crystals Growth
Pt Solubility Limit
Atomically Mixed Pt Source
Solid State Pt Source
Weight Loss Studies
Yba/sub 2/cu/sub 3/o/sub 7/
Materials Science And Technology
Solid State Circuits
Engineered Materials, Dielectrics And Plasmas
Fields, Waves And Electromagnetics