Journal
CHEMIE DER ERDE-GEOCHEMISTRY
Volume 75, Issue 3, Pages 317-322Publisher
ELSEVIER GMBH
DOI: 10.1016/j.chemer.2015.04.004
Keywords
Crystal growth; Sr3Gd2[BO3](4); Ca4GdO[BO3](3); Spectroscopy; Optics; SGB; GdCOB; Borate
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Funding
- Deutsche Forschungsgemeinschaft (DFG) [DFG GO 667/10-1]
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Single crystals of Ca4GdO[BO3](3) and Sr3Gd2[BO3](4) were synthesized using the Czochralski method, both in different crystallographic directions. Best result were obtained for '010' orientated seeds and growth rates of 1 mmh(-1). The morphology of the as-grown crystals reflects the symmetry and for Ca4GdO[BO3](3)-crystals a typical rhombohedral and for Sr3Gd2[BO3](4)-crystals almost circular cross section are formed. UV-VIS and IR measurements show a wide range of transmission of light. Between 350-1100 and 1600-2500nm no absorption was observed. Below 350 nm the crystals show distinct absorption peaks caused by electron transitions of Gd. In the IR region most vibration modes can be assigned to [BO3](3-)-groups and Gcl/Ca-O or Gd/Sr-O-polyhedra. (C) 2015 Elsevier GmbH. All rights reserved.
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