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The direct silicon nitridation method was used to synthesize Ca-α-sialon:Eu 2+ phosphors. From a low cost CaCO 3 –AlF 3 –Si mixture, pure α-sialon phase was produced at a low temperature of 1250°C. The crystallinity of the obtained phosphors can be markedly improved by increasing the firing temperature or post-annealing. Solid–gas reactions occur easily, according to thermodynamic...
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