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Monoclinic (Celsian) and hexagonal (Hexacelsian) Ba 1−x Sr x Al 2 Si 2 O 8 solid solutions, where x=0, 0.25, 0.375, 0.5, 0.75 or 1, were synthesized by using Coal Fly Ash (CFA) as main raw material, employing a simple one-step solid-state reaction process involving thermal treatment for 5h at 850–1300°C. Fully monoclinic Celsian was obtained at 1200°C/5h, for...