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Optical Observation of Striations in Y2Ti2O7 Single Crystals

1
School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China
2
MIIT Key Laboratory of Radiation Detection Materials and Devices, Northwestern Polytechnical University, Xi’an 710072, China
3
Brockhouse Institute for Materials Research, McMaster University, Hamilton, ON L8S 4M1, Canada
4
Department of Physics and Astronomy, McMaster University, Hamilton, ON L8S 4M1, Canada
*
Author to whom correspondence should be addressed.
Crystals 2019, 9(5), 233; https://doi.org/10.3390/cryst9050233
Received: 12 March 2019 / Revised: 24 April 2019 / Accepted: 26 April 2019 / Published: 1 May 2019
(This article belongs to the Special Issue Optical Floating Zone and Crystals Grown by this Method)
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Abstract

RE2Ti2O7 (RE = Y, Yb, Ho, Er) pyrochlores are very interesting as potential candidates for host materials for applications in transition-metal ions lasers. Y2Ti2O7 crystals were grown by the optical floating zone (OFZ) method. The shape of the growth interface is of paramount importance for the growth of single crystals. As striation and the growth interface have the same shape, we observed the striations in as-grown crystals under polarized light. The degree of overheating of the molten zone influences the shape of the growth interface. An increase of power supplied to the molten zone combined with a decrease of both, thermal conductivity and the amount of heat dissipated by the seed-rod, causes an increase in the degree of overheating of the floating zone. Under a high degree of overheating, the interface of the crystal grown is less convex, with smaller curvature. With the speed of rotation of these crystals decreasing from 30 to 7 rpm, the curvature of striations decreases and the shape of the growth interface changes from convex to less convex, and finally to concave. View Full-Text
Keywords: crystal growth; optical floating zone method; interface; striation crystal growth; optical floating zone method; interface; striation
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Liu, C.; Dabkowski, A.; Jie, W.; Gaulin, B.D.; Dabkowska, H.A. Optical Observation of Striations in Y2Ti2O7 Single Crystals. Crystals 2019, 9, 233.

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