ISSN:
1573-482X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Electrical Engineering, Measurement and Control Technology
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Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The crystallization temperatures of KTiOPO4(KTP), KTP : Nb and RbTiOPO4(RTP) in the flux systems, K6P4O13 (K6) or Rb6P4O13 (R6), were determined by thermogravimetric analysis. The systems have a large tendency to supercool, which could be greatly reduced by the top-seeding technique. Seed-testing experiments were used to study the dissolution kinetics. The diffusion equation under steady state conditions was used to derive an expression for the seed dissolution, which enables one to introduce the diffusion activation energy and the diffusion rate parameter from the experimental data. Consequently, the stable growth rate and the cooling programme for the crystal growth can be estimated. The stable growth rate decreases with temperature and is in the order of 0.1 mm day-1 in unstirred solutions. The optimal cooling rate curve, however, goes through a maximum as the temperature falls. A stable growth rate and suitable supercooling are essential for the growth of large single crystals of high quality. © 1998 Chapman & Hall
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1008874906569
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