, Volume 7, Issue 5, pp 273-279

Synthesis and Properties of Willemite, Zn2 SiO4 , and M2+ :Zn2 SiO4 (M = Co and Ni)

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Fine particles of willemite, α-Zn2SiO4, were prepared by both solution combustion and sol-gel methods. Both processes yield single-phase, large-surface area (26- and 78-m2/g), sinteractive willemite powders. Thermal evolution of crystalline phases was studied using X-ray powder diffraction patterns. The combustion method favors low-temperature formation of willemite compared to the sol-gel method. The powders, when uniaxially pressed and sintered at 1300°C, achieved 78–80% theoretical density. The microstructures of the sintered body show the presence of equiaxed 0.5- to 4-μm grains. Blue pigments of willemite doped with Co2+ and Ni2+ were also prepared by the combustion process.