A new route including precipitation combined with calcination has been developed for the synthesis of strontium orthosilicate (Sr₂SiO₄) nano-sized particles. The stirring of the boiling aqua suspension prepared from hydrosilicagel derived from serpentine minerals ((Mg(Fe))₆[Si₄O₁₀](OH)₈), sodium hydroxide (NaOH) and strontium chloride (SrCl₂) results in the precipitation of hydrated strontium silicate species whose dehydration is followed by their crystallization into strontium ortho- and metasilicate SrSiO₃ on heating. The stirring time and sodium hydroxide concentration are the key parameters controlling strontium silicates formation. The influence of these parameters on the precipitates formation and their phase transformations at various temperatures has been studied by X-ray diffraction, thermal analyses and electron microscopy. The optimal parameters, namely the molar ratio of initial reagents, stirring time, the temperature and duration of heat treatment providing strontium orthosilicate synthesis, have been suggested. The average particle size of strontium orthosilicate synthesized by this method is 20–40 nm.

中文翻译：

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开发合成原硅酸锶的新途径

为合成原硅酸锶（Sr ₂ SiO ₄）纳米尺寸的颗粒，开发了一种包括沉淀与煅烧相结合的新途径。搅拌从蛇纹石矿物（（Mg（Fe））₆ [Si ₄ O ₁₀ ]（OH）₈）的水凝胶制备的沸腾水悬浮液，氢氧化钠（NaOH）和氯化锶（SrCl ₂）水合硅酸锶物质的合成，其脱水后结晶为锶正硅酸盐和偏硅酸锶SrSiO ₃在加热。搅拌时间和氢氧化钠浓度是控制硅酸锶形成的关键参数。通过X射线衍射，热分析和电子显微镜研究了这些参数对沉淀物形成及其在不同温度下的相变的影响。已经提出了最佳参数，即初始试剂的摩尔比，搅拌时间，提供原硅酸锶合成的热处理温度和持续时间。通过这种方法合成的原硅酸锶的平均粒径为20–40 nm。