Growth and characterization of LiCaGaF6

Year: 2005

Authors: Sani E., Rabe M., Reck G., Becker P., Roßberg M., Bertram R., Klimm D.

Autors Affiliation: Università di Pisa, Dipartimento di fisica, via Buonarroti 2, 56127 Pisa, Italy:
Institut für Kristallzüchtung, Max-Born-Str. 2, 12489 Berlin, Germany;
Bundesanstalt für Materialforschung und -prüfung, Richard-Willstätter-Str. 11, 12489 Berlin, Germany;
Universität zu Köln, Institut für Kristallographie, Zülpicher Str. 49 b, 50674 Köln, Germany

Abstract: Optically clear LiCaGaF6 (LiCGaF) single crystals up to 15 mm length were grown by the Czochralski method from CaF2 deficient melts. The substance melts incongruently at 751degreesC. No significant deviations of the crystal composition from the nominal stoichiometry Li:Ca:Ga=1:1:1 could be found. X-ray structure analysis revealed that the substance crystallizes in the colquiriite type structure. LiCaGaF6 is transparent for optical wavelengths >140 – 150 nm. The thermal expansion of the trigonal crystals is alpha(11) = alpha(22) = 18.7x 10(-6) K-1 perpendicular [001] and alpha(33) = 2.7x 10(-6) K-1 parallel [001].

Journal/Review: CRYSTAL RESEARCH AND TECHNOLOGY

Volume: 40 (1-2)      Pages from: 26  to: 31

KeyWords: Crystal growth; Crystallization; Hydrolysis; Melting; Phase diagrams; Stoichiometry; Thermal expansion, Czorcharlski method; Fluorides; Laser crystals; Optical wavelengths, Lithium compounds
DOI: 10.1002/crat.200410304

Citations: 2
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