Open AccessEXPERIMENTAL INVESTIGATION OF STABILITY OF PLANAR CRYSTAL-MELT INTERFACE AND EVOLUTION OF CELLULAR INTERFACE DURING CZOCHRALSKI GROWTH OF LiNbO3 SINGLE CRYSTALS DOPED WITH YTTRIUM
Author(s) -
Ming Nai-Ben,
Fang Zhou
Publication year - 1986
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.35.1603
Subject(s) - planar , perturbation (astronomy) , instability , materials science , condensed matter physics , anisotropy , epitaxy , yttrium , doping , crystal growth , optics , crystallography , physics , chemistry , mechanics , nanotechnology , computer graphics (images) , computer science , metallurgy , oxide , layer (electronics) , quantum mechanics
By using periodic rotational striations as a time marker, the initial instability of a planar interface and the development of the cellular interface have been studied in Czochralski growth system of anisotropic LiNbO3 crystals doped with yttrium. The critical condition for very birth of instability of planar interface has been obtained. And there are two kinds of initial perturbations to be observed, that is, sinusoidal perturbation and sinusoidal travelling wave perturbation. Experimental results revealed that the planar interface evolves from sinusoidal perturbation to facetted perturbation to coarse facetted perturbation, finally, to stable cellular interface. It has been found that the wave-length of stable cellular interface is different from that of initial perturbation and always integral times larger than that of initial one. There is also a difference to be found between critical velocity of the plane-to-cell transition and that of cell-to-plane transition for a same crystal grown from the same system. It may be implied that the facetted cell is more stable than the nonfacetted plane.