The Phase and Structural Properties
of LiYF₄ Crystals as Probed by Local Methods

M. V. Zamoryanskaya*, M. A. Petrova**, and V. Yu. Egorov**

*Ioffe Physicotechnical Institute, Russian Academy of Sciences,
Politekhnicheskaya ul. 26, St. Petersburg, 194021 Russia

**Research Institute of Optical Materials Technology, “Vavilov State Optical Institute” All-Russia Scientific Center,
Birzhevaya liniya 14, St. Petersburg, 190164 Russia

Abstract—The defects in undoped and RE-doped LiYF₄ crystals have been studied by using electron probe
microanalysis, scanning electron microscopy, and local cathodoluminescence. An attempt has been undertaken
to relate the generation of structural defects, such as YF₃ and LiF phase precipitation and deviation from sto-
ichiometry in the course of crystallization, to the crystal-growth technique and physicochemical conditions of
crystal growth from melt. The distribution of RE activators along the crystal length and diameter has been deter-
mined, and the influence of defects on the luminescence spectra of RE ions has been established.

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