On the distribution of Sc3+ impurity in directed crystallization of fluorite from the melt

Molev, Gregory; Bozhevol’nov, V. E.; Korobkov, V. I.; Karelin, V. V.

doi:10.1016/0022-0248(73)90020-1

Cited by 7 publications

(2 citation statements)

References 3 publications

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“…To avoid the use of ineffective HF, other researchers propose saturating the space above the melt with fluorine based on the decomposition of fluoro-carbon polymers, in particular PTFE (teflon) [50,51]. In this case the crucible assembly differs according to where the section involving reaction occurs e inside or outside the furnace.…”

Section: Growth In a Reactive Atmospherementioning

confidence: 99%

Control of oxygen contamination during the growth of optical calcium fluoride and calcium strontium fluoride crystals

Mouhovski

2007

Progress in Crystal Growth and Characterization of Materials

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Section: Growth In a Reactive Atmospherementioning

confidence: 99%

Control of oxygen contamination during the growth of optical calcium fluoride and calcium strontium fluoride crystals

Mouhovski

2007

Progress in Crystal Growth and Characterization of Materials

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“…The method consists in the fact that the rate of the entire batch of CaF 2 in the crucible, which is of cylindrical shape with a conical bottom, and then is lowered into the crucible colder part of the furnace, so that the crystallization process begins at the bottom of the crucible at the top of the cone. Reviewing the literature it can be noted that the crucible can be made from spectroscopically pure graphite [20,21,25,28,29] or platinum [30].…”

Section: Introductionmentioning

confidence: 99%

The Bridgman method growth and spectroscopic characterization of calcium fluoride single crystals

Elswie

Lazarević

Radojević³

et al. 2016

SCI SINTER

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It must be noted that the main objective of this study was to obtain single crystals of calcium fluoride -CaF 2 , and after that the crystals were characterized with various spectroscopic methods. The crystals were grown using the Bridgman technique. By optimizing growth conditions, <111> oriented CaF 2 crystals up to 20 mm in diameter were grown.Number of dislocations in CaF 2 crystals was 5×10 4 -2×10 5 per cm 2 . Selected CaF 2 single crystal is cut into several tiles with the diamond saw. The plates were polished, first with the silicon carbide, then the paraffin oil, and finally with a diamond paste. The obtained crystal wаs studied by Raman and infrared -IR spectroscopy. The crystal structure is confirmed by Xray diffraction (XRD). One Raman and two IR optical modes predicted by group theory are observed. A low photoluminescence testifies that the concentration of oxygen defects within the host CaF 2 is small. All performed investigations show that the obtained CaF 2 single crystal has good optical quality, which was the goal of this work.

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Gas bubble associated mass transport in Bridgman‐Stockbarger melt growth system

Պետրոսյան¹

1983

Cryst. Res. Technol.

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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.

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On the distribution of Sc3+ impurity in directed crystallization of fluorite from the melt

Cited by 7 publications

References 3 publications

Control of oxygen contamination during the growth of optical calcium fluoride and calcium strontium fluoride crystals

Control of oxygen contamination during the growth of optical calcium fluoride and calcium strontium fluoride crystals

The Bridgman method growth and spectroscopic characterization of calcium fluoride single crystals

Gas bubble associated mass transport in Bridgman‐Stockbarger melt growth system

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