Spectroscopic properties of Cr-doped melilite crystals |
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| Authors: | Akiko Sugimoto Yukio Nobe Takafumi Yamazaki Yutaka Anzai Kiyoshi Yamagishi Yusaburo Segawa Humihiko Takei |
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| Institution: | (1) Corporate R&D Center, Mitsui Mining & Smelting Co., Ltd., 1333-2 Haraichi Ageo Saitama, 362, Japan Fax 81-48-775-6373, JP;(2) Photodynamic Research Center, The Institute of Physical and Chemical Research (RIKEN), Nagamachi Koeji 19-1399, Aoba-ku, Sendai, Miyagi, 982, Japan, JP;(3) Faculty of Science, Osaka University, 1-16 Machikaneyama Toyonaka, Osaka, 560 Japan, JP |
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| Abstract: | Four kinds of Cr-droped melilite crystals, Ca2MgSi2O7 (akermanite), CaAl2SiO7 (gehlenite), CaGa2SiO7 (Ga-gehlenite) and CaGa2GeO7 (GaGe-gehlenite), with different sizes of the sites for Cr ions to substitute, were grown in series, using both the CZ and
FZ techniques. Although Cr4+ is regarded as a major species in melilites, the existence of Cr6+ in gehlenite is also suggested from the change in absorption spectra by annealing, and the dependence of distribution coefficient
of Cr ions on growth atmosphere. Spectral peak shifts are not obvious if the host crystal field is altered in melilites, because
the local environment of the sites for Cr ion is possibly changed by reforming the packing features of the host lattice.
Received February 7, 1996 / Revised, accepted September 20, 1996 |
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