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Growth spirals of gadolinium gallium garnet (GGG) crystals
Author(s) -
Naumowicz P.,
Wieteska K.,
Szarras S.,
Cinak J.
Publication year - 1981
Publication title -
kristall und technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0023-4753
DOI - 10.1002/crat.19810160905
Subject(s) - crystallization , crystal (programming language) , gallium , materials science , asymmetry , spiral (railway) , gadolinium gallium garnet , crystal growth , lattice (music) , crystallography , convection , lattice constant , optics , condensed matter physics , chemistry , epitaxy , physics , thermodynamics , nanotechnology , diffraction , metallurgy , layer (electronics) , computer science , programming language , mathematical analysis , mathematics , quantum mechanics , acoustics
Slices cut from various locations in two GGG spirals grown by the Czochralski method have been studied using double crystal X‐ray topography. In selected regions of the slices the lattice parameter has been measured by a modified Bond method. An increase of lattice parameter has been found in the outer part of the crystal where growth bands have smaller periodicity than those in the central region of the spiral. An analysis of crystallization front changes allowed us to suppose that the asymmetry of the heat field around the growing crystal, and the forced convection of the melt, are responsible for the crystal's growing in the shape of a spiral.