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The effect of radiation trapping on the emission properties of Er 3+ -doped tellurite and phosphate glasses has been investigated as the function of sample thickness and doping concentration. It was found that radiation trapping exists generally in two glass matrices, even at low doping concentration (⩽0.1mol% Er 2 O 3 ). The larger effect of radiation trapping in tellurite...
Variations in the far infrared region of the Raman spectra of kaolinites are related to the incorporation of titanium in the kaolinite lattice and to the presence of accessory anatase. The spectra of titanium-free kaolinites exhibit weak kaolinite bands. An exceptional intensity of a kaolinite band at 130cm −1 in anatase-free kaolinites is characteristic of titanium-bearing kaolinites. The...
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