FIELD: chemistry.
SUBSTANCE: initial mixture is added with at least dopant as MgO, TiO2 and Al2O3 in total within 0.5 to 5.0% (wt) in ratio to initial mixture weight. Annealing is two-staged: the first stage includes annealing of initial mixture at temperature 600-800°C; then produced furnace feed is mixed and annealed at temperature 800-1000°C.
EFFECT: lower power inputs and improved synthesis process.
6 dwg, 4 ex
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