Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9829472 | Journal of Crystal Growth | 2005 | 10 Pages |
Abstract
The microstructures of Cr4+:YAG crystal fibers grown along [1 1 1] direction by laser-heated pedestal growth method were studied by optical and analytical electron microscopy. Curved growth ledges were found on the round side surface of the fiber grown at a relatively high speed. In contrast, nonepitaxial Cr3âδO4 crystallites with spinel-type structure were formed on the {1 1 2} side surfaces, via an intermediate surface melt, when the fibers were grown at a lower speed. The deposition of Cr3âδO4, rather than segregation of Cr and Ca codopants, as of concern to the Cr4+ fluorescence, can be rationalized by a high crystal field stabilization of octahedrally coordinated Cr3+ attained in rather refractory and close packed oxide.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
J.Y. Ji, P. Shen, J.C. Chen, F.J. Kao, S.L. Huang, C.Y. Lo,