Valence and site occupation of chromium ions in single-crystal forsterite fibers

Chromium-doped, single-crystal forsterite (Mg2SiO4) fibers were grown in reducing and oxidizing atmospheres by the laser-heated-pedestal- growth (LHPG) technique. The valence and site occupation of chromium ions were analyzed by laser spectroscopy. Cr3+ ions are situated on two inequivalent octahedr...

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Bibliographic Details
Published in:Journal of crystal growth 1991-02, Vol.109 (1-4), p.329-333
Main Authors: Jia, Weiyi, Lu, Lizhu, Tissue, B.M., Yen, W.M.
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Inorganic compounds
Physics
Salts
Structure of solids and liquids
crystallography
Structure of specific crystalline solids
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Summary:Chromium-doped, single-crystal forsterite (Mg2SiO4) fibers were grown in reducing and oxidizing atmospheres by the laser-heated-pedestal- growth (LHPG) technique. The valence and site occupation of chromium ions were analyzed by laser spectroscopy. Cr3+ ions are situated on two inequivalent octahedral sites, Cr3+ (I) and Cr3+ (II). The former is a high-field site giving sharp, R-line-type emission at 692.7 nm, while the latter is a low-field site giving 4T2 broadband emission at 866nm. The fibers grown in oxygen or air atmosphere contained a large number of Cr4+ ions, which replace Si4+ in tetrahedral sites. Cr4+ low-temperature fluorescence from the 3A1(3T2) excited state to the 3A2 ground state had sharp peaks at 1094.5, 1092.8, and 1090.6 nm.
ISSN:0022-0248
1873-5002
DOI:10.1016/0022-0248(91)90199-F