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Effect of Yb content on purity and crystal growth of Ba2NaNb5O15 |
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| Authors: | K. Lebbou H. Itagaki A. Yoshikawa T. Fukuda F. Carillo-Romo G. Boulon A. Brenier M. Th. Cohen-Adad |
| Affiliation: | a Institute for Materials Research (IMR), Tohoku University, Sendai 980, Japan b Physical Chemistry of Luminescent Materials, Claude Bernard /Lyon 1 University, CNRS UMR 5620, 69622 Villeurbanne Cedex, France |
| Abstract: | Growth by the micro-pulling-down technique (μ-PD) of homogeneous and crack-free fiber single crystals with composition Ba2Na1−xYbxNb5O15 (0<x<0.08) is reported. The effect of Yb3+ addition to barium sodium niobate (BNN, x=0), having the tungsten bronze-type structure, was examined by room temperature X-ray powder diffraction and differential thermal analysis coupled to thermogravimetry. In the region of the monophased field the structure is tetragonal from x=0.02 to 0.16. Volume change is mainly by variation of the a-axis length. Addition of Yb3+ to BNN could be effective for the production of high optical quality, crack-free, bulk crystals by the Czochralski technique. |
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