【摘要】 报导在尿素存在下通过均相沉淀法由硝酸铜和重铬酸铵制备复合均匀胶体粒子的结果．研究了一些实验参数对其组成、形态和粒子大小的影响．确定了胶体粒子的制备条件．结果观测到，由硝酸铜和重铬酸铵溶液形成了球形的多刺的粒子，它的组成为水含铅酸铜．更多还原

【Abstract】 Uniform particles of copper(Ⅱ) a11d chromium (Ⅵ) compounds were prepared by homogeneous precipitation from copper nitrate and ammonium dichromate solutions in the presenceof urea. The effects of various experimental parameters on the composition, morphlology, and sizeof the resulting particles were studied. The concentrations of metal salts varied over the raug2.0×10-4-3.2×10-3 mol.dm-3, with ratio [Cu(NO3)2]/[(NH4)2Cr2O7] = 2, and with the ureaconcentration 0.1-1.25 mol.dm-3. The aging was carried out at 78℃ over a period up to severalhours. Thus, copper nitrate and ammonium dichromate solutions yielded spherical thorny particleswhich had the composition of hydrated copper chromate. Calcination of the particles at 400 ℃produced CuCrO4, the particle morphology of which was retained更多还原