Morphologic defects in Cr3+:LiCaAlF6 crystals grown by the Czochralski method

D. Klimm; K. Seiranian; Peter Reiche; A. Polity; R. Krause-Rehberg

doi:10.1117/12.280747

14 July 1997 Morphologic defects in Cr3+:LiCaAlF6 crystals grown by the Czochralski method

D. Klimm, K. Seiranian, Peter Reiche, A. Polity, R. Krause-Rehberg

Proceedings Volume 3178, Solid State Crystals: Growth and Characterization; (1997) https://doi.org/10.1117/12.280747
Event: XII Conference on Solid State Crystals: Materials Science and Applications, 1996, Zakopane, Poland

Abstract

The paper reports on the growth of Cr³⁺:LiCaAlF₆ single crystals by the Czochralski method from a stoichiometric melt of LiF, CaF₂, and AlF₃. (Cr³⁺ doping was obtained by the replacement of about 3 Mol-% AlF₃ by the corresponding quantity CrF₃.) Only the peripheric region and the neck of the crystals have high optical quality, whereas scattering 'needles' of typically 5 multiplied by 5 multiplied by 35 micrometers cubed can be observed in the top region and very small particles very much less than 1 micrometer ('dust') can be observed in the bottom part of the crystals. By EDX element analysis performed after ion beam thinning of the samples the needles were determined to have an excess Ca content in comparison to the LiCaAlF₆ matrix. The binary compound LiAlF₄ has the highest vapor pressure in the ternary system LiF - CaF₂ - AlF₃. It can be concluded, that LiAlF₄ evaporates continuously during crystal growth, leaving in the melt CaF₂ in excess. The incongruently melting compound Ca₂AlF₇ is considered to be the most probable candidate for the observed scattering centers.

Citation Download Citation

D. Klimm, K. Seiranian, Peter Reiche, A. Polity, and R. Krause-Rehberg "Morphologic defects in Cr3+:LiCaAlF6 crystals grown by the Czochralski method", Proc. SPIE 3178, Solid State Crystals: Growth and Characterization, (14 July 1997); https://doi.org/10.1117/12.280747

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available