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MORPHOLOGY OF DIAMOND SINGLE CRYSTALS GROWN IN THE Fe-Co-Mg-C SYSTEM
摘要： Diamond single crystals in a Fe-Co alloy with addition of 5 and 10 wt. % Mg by temperature gradient method were grown and their morphology was studied. For crystals obtained in the Fe-Co alloy with 5 wt. % Mg, the faces of octahedron, cube, rhomb-dodecahedron and tetragon-trioctahedron {311} were observed. When the magnesium content in the solvent-alloy increase up to 10 wt. % under the same growth conditions the tetragon-trioctahedron {311} faces on diamond crystals were absent. The topography of diamond crystals faces grown in different systems indicates that octahedron and cube are active growth forms with their growth pyramids, and rhomb-dodecahedron and tetragon-trioctahedron {311} are forms of passive growth.
关键词： A1.Crystal morphology,B1. Diamond,A2. Single crystal growth,A2. Growth from high temperature solutions
更新于2025-09-10 09:29:36
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Effect of Tm3+ Sensitization to Ho3+ Doped GeO2-B2O3-BaF2-Al2O3-ZnO2-Na2O Glass on Spectral Properties
摘要： A series of Tm3+/Ho3+ sensitized 65GeO2-7BaF2-10B2O3-4Al2O3-4ZnO2-10Na2O glass samples were synthesized by using high temperature melting method. The spectral properties were systematically studied when Ho3+ concentration was 0.1, 0.3, 0.5 mol % and Tm2O3 changed from 0.3 to 2.5 mol %. Differential thermal analysis showed that ?T was higher than 190 oC, which illustrated this kind of matrix glass have better thermal stability. The absorption cross section peak height, free energy of Ho3+ from 5I8 to 5I7 and emission cross section were calculated according to Mc-Cumber theory. Under the excitation of 808 nm laser diode, fluorescence intensity at 1954 nm reached the highest value when the concentration of Ho3+ was 0.1 mol % and Tm3+ was 0.7 mol %. However the fluorescence intensity reduced greatly when Ho3+ concentration was 0.5 mol % and Tm3+ exceeded 1.5 mol %. The sensitized function and influence of different Tm3+/Ho3+ doped ion ratios on the spectral properties was studied.
关键词： Glasses,Growth from high temperature solutions,Rare earth compounds,Adsorption
更新于2025-09-04 15:30:14