In-situ temperature field measurements and direct observation of crystal/melt at vertical Bridgman growth of lead chloride under stationary and dynamic arrangement

0449449 - FZÚ 2016 RIV NL eng J - Journal Article
Král, Robert - Nitsch, Karel
In-situ temperature field measurements and direct observation of crystal/melt at vertical Bridgman growth of lead chloride under stationary and dynamic arrangement.
Journal of Crystal Growth. Roč. 427, Oct (2015), 7-15. ISSN 0022-0248. E-ISSN 1873-5002
R&D Projects: GA MŠMT(CZ) LH14266
Institutional support: RVO:68378271
Keywords : single crystal growth * temperature field measurements * crystal/melt interface * lead chloride * vertical Bridgman method
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 1.462, year: 2015

Influence of growth conditions, i.e. temperature gradient in the furnace and the pulling rate, on the position and the shape of the crystal/melt during vertical Bridgman growth was studied. Following two methods were used for characterization of its position and shape by: (i) direct observation and (ii) direct temperature field measurement during simulated vertical Bridgman growth. As a model compound a lead chloride used. Three different ampoule positions in two different temperature gradients in the furnace and three experimental arrangements – stationary (0 mm/h pulling rate) and dynamic (3 mm/h pulling rate) were analyzed. Obtained temperature data were projected as 2D planar cut under radial symmetry and denoted as isolevels. Their further conversion by linear approximation into isotherms allowed detail analysis of heat conditions in the system during simulated growth by comparison of isotherms 500 °C (m.p. of lead chloride) at different growth conditions.
Permanent Link: http://hdl.handle.net/11104/0250994