Peculiarities of the Ni²⁺ ions in the crystal lattice of Bi₁₂SiO₂₀:Ni

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• 作者：P. Petkova ; ^{Petya232@abv.bg}
• 关键词：Sillenites ; Urbach&rsquo ; s rule ; Jahn&ndash ; Teller effect ; IR spectroscopy
• 刊名：Optical Materials
• 出版年：2012
• 出版时间：March, 2012
• 年：2012
• 卷：34
• 期：5
• 页码：906-909
• 全文大小：353 K

文摘

Absorption measurements are taken over a wide spectral range which includes the visible, near and far IR region (500-22,272 cm^?). The exponential absorption edge parameters ¦Ò(T), ¦Ò₀, W_d and g are calculated for undoped and Ni doped Bi₁₂SiO₂₀ at room temperature. The dopant nickel ion is double-charged and occupies the tetrahedral sites in the crystal lattice of doped sillenite. The energy level structure of the Ni²⁺ ion in Bi₁₂SiO₂₀:Ni (BSO:Ni) is also presented. The crystal field parameter Dq and the Racah parameters B and C are calculated. It is established that the Jahn-Teller effect displays very strong influence in a distored tetrahedral Ni²⁺ complex. The two-photon absorption of BSO:Ni is studied in far IR region.