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Optical spectroscopy and crystal-field strength of Cr^(3+) in various solid matrixes 被引量:2
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作者 XIA Haiping WANG Jinhao WANG Hongyin ZHANG Jianli ZHANG Yuepin XU Tiefeng 《Rare Metals》 SCIE EI CAS CSCD 2006年第1期51-57,共7页
The Cr^3+:BeAl2O4 crystal, Cr^3+:LiNbO3 crystal, and ZnO-Al2O3-SiO2 glass-ceramic were obtained by the Czochralski technique, Bridgman method, and melting processing, respectively. The optical absorption and emiss... The Cr^3+:BeAl2O4 crystal, Cr^3+:LiNbO3 crystal, and ZnO-Al2O3-SiO2 glass-ceramic were obtained by the Czochralski technique, Bridgman method, and melting processing, respectively. The optical absorption and emission spectra of the above Cr^3+-incorporated solid-state materials were recorded. The technical parameters for growing high-quality Cr^3+:BeAl2O4 and Cr^3+:LINbO3 crystals were obtained. The results indicate that the optical absorption and fluorescence spectra of Cr^3+ show quite a few differences in various matrixes. The sharp line emissions were observed in the Cr^3+:BeAl2O4 and Cr^3+:LiNbO3 crystals. The crystal-field parameters (Dq) for Cr^3+. in different matrixes were calculated from their corresponding spectra. It is indicated that Cr^3+:BeAl2O4 and Cr^3+:LiNbO3 belong to the high-field site crystal, while the Cr^3+ ZnO-Al2O3-SiO2 glass and glass-ceramic belong to the weak-field site crystal. 展开更多
关键词 special functional inorganic materials optical spectroscopy optical measurement Cr^3+ ion matrix
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Hydrothermal Synthesis of Nanostructural La_xBi_(2-x)Se_yTe_(3-y) Powders 被引量:1
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作者 Zhang Yanhua Zhao Xinbing Zhu Tiejun 《Journal of Rare Earths》 SCIE EI CAS CSCD 2006年第1期49-49,共1页
Nanostructural monophase LaxBi2-xSeyTe3-y alloy was synthesized with a hydrothermal route using BiCl3, LaCl3, selenium and tellurium powders as the precursors, NaOH and disodium ethylenediaminetetraacetiate (EDTA) ... Nanostructural monophase LaxBi2-xSeyTe3-y alloy was synthesized with a hydrothermal route using BiCl3, LaCl3, selenium and tellurium powders as the precursors, NaOH and disodium ethylenediaminetetraacetiate (EDTA) as the additives. The hydrothermally synthesized powders have a petal-like morphology self-structured by the parallel side-by-side arrangement of the nano-scales. It is found that an alkaline additive is necessary for the synthesis of a monophase Bi2Te3 based alloy. 展开更多
关键词 special functional metallic materials rare earth compounds hydrothermal synthesis thermoelectric materials NANOSTRUCTURE
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