Preparation of Nano-powders of b-HgS and a-HgS

Abstract A new method for the preparation of nano-powder b-HgS (black, cubic crystal) by homogeneous phase precipitation method has been developed. The influence of pH values, concentration, temperatures and elution solution on the particle diameter of HgS have been studied using activated Na₂S_x to transform nano-powder a-HgS (red, hexagonal) in moderate condition. The conclusion can be drawn that the value of x in Na₂S_x, the time of boiling, the ratio of Na₂S_x to HgS and the particle diameter of b-HgS with effect in transformation. The structure and particle diameter of b-HgS were investigated with SEM and XRD.
Key words Homogeneous phase precipitation method, Nano-powder, b-HgS (black, hexagonal system), a-HgS (red, cubic system), Na₂S_x

纳米b-HgS与a-HgS微粉的制备

摘要 用均相沉淀法制备纳米级b型HgS(黑色，立方晶系)微粉，研究了介质的酸度、反应物的浓度、热处理温度及洗涤剂对HgS(黑)粒径的影响，探讨了制备纳米HgS(黑)的最佳条件。在此基础上，利用多硫化钠活化方法，将HgS(黑)在较温和条件下转化为纳米级的a型HgS(红色，六方晶系)，并探讨了Na₂S_x的x值、加热时间、以及Na₂S_x与HgS(黑)的物质的量的比、HgS(黑)的粒径等因素对转化的影响。用SEM和XRD对其粒径大小、形貌和晶型等进行了表征。
关键词 均相沉淀法 纳米级微粉 b型HgS(黑色，立方晶系) a型HgS(红色，六方晶系) Na₂S_x

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