Growth of stoichiometric MgAl spinel single crystals by a modified verneuil technique

Falckenberg, R.

doi:10.1016/0022-0248(72)90549-0

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1976

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Cited by 14 publications

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“…With spinel crystals, it could be shown that cracking can be avoided by modifying the technique (6). The idea of the modification is to essentially exclude the temperature shock a crystal suffers at the end of the growth process when the flame is quenched.…”

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confidence: 99%

Flame Fusion Growth of Spinel and Sapphire Crystals for ESFI SOS Technology

Falckenberg¹

1976

J. Electrochem. Soc.

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A modified flame fusion process has been developed to grow crystals at low cost for use as substrate for the ESFI® SOS technology. Mg‐Al spinel and sapphire single crystals with diameters up to 50 mm have been grown. Differences between both kinds of crystals are described concerning the behavior during the widening phase and the cooling phase of the growth process. Crystalline perfection was investigated in both crystals by the x‐ray topography.

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confidence: 99%

Flame Fusion Growth of Spinel and Sapphire Crystals for ESFI SOS Technology

Falckenberg¹

1976

J. Electrochem. Soc.

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Powder feeder for crystals of large diameter grown by the verneuil technique

Falckenberg

1978

Cryst Res and Technol

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To grow crystals of large diameter (= 50 mm) by t h e flame fusion process it is necessary t o feed powder with a flow rate of = 2 g/min into the gas stream, the grain size being as small as possible. The properties of vertically and horizontally excitated sieves are compared. A sieve arrangement with horizontal and vertical vibration is described, which at a mesh width of 90 pm has a powder flow of up to 5 g/min. The long range constancy was within f8Y0. Sieves with a mesh width < 90 prn can be used if a n ultrasonic disintegrator is mounted above the feeder sieve. Sapphire and Mg-A1 spinel crystals up to 65 mm in diameter could be grown.

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Tables 1 - 5, Figs. 1 - 12

Bonnenberg¹,

Hempel²

Landolt-Börnstein - Group III Condensed Matter

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Growth of stoichiometric MgAl spinel single crystals by a modified verneuil technique

Cited by 14 publications

References 9 publications

Flame Fusion Growth of Spinel and Sapphire Crystals for ESFI SOS Technology

Flame Fusion Growth of Spinel and Sapphire Crystals for ESFI SOS Technology

Powder feeder for crystals of large diameter grown by the verneuil technique

Tables 1 - 5, Figs. 1 - 12

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