Chromium‐Doped Forsterite Nanoparticle Synthesis by Flame Spray Pyrolysis - Progress in Nanotechnology - Wiley Online Library

Synthesis of chromium-doped forsterite (Mg₂Si0₄:Cr) nano-particles by flame spray pyrolysis (FSP) was investigated. The morphology, crystalline phase, and photoluminescence of the products were evaluated. Crystalline Mg₂Si0₄:Cr nanoparticles of several 10 nm in diameter were obtained, although a small amount of the submicrometer-sized particles and the unreacted MgO phase existed. The product powder showed electron-spin resonance signals from Cr and photoluminescence typical for Cr₄+ in Mg₂Si0₄, suggesting that a part of the Cr₄ + ions were incorporated into Si₄ sites by FSP. On the other hand, the effects of excess Si0₂ addition on the structural and optical characteristics of Mg₂Si0₄:Cr were examined. Addition of excess Si0₂ up to 20 mol% did not influence these characteristics of the products. Further addition of excess Si0₂ enhanced the formation of the amorphous phase and resulted in the emission from Cr₃+ in the amorphous phase in addition to an emission from Cr₄+ in Mg₂Si0₄.

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