Ultrafine Ammonium Nitrate

As with other metals, it becomes more reactive as it is more finely divided. Ultrafine iron powder is pyrophoric and potentially explosive. Explosive or violent reaction with ammonium nitrate + heat, ammonium peroxodisulfate, chloric acid, chlorine trifluoride, chloroformamidinium nitrate, bromine pentafluoride + heat (with iron powder), air + oil (with iron dust), sodium... 

Chemical precipitation is a popular method for synthesizing solid materials from solution in which a liquid-phase reaction is utilized to prepare insoluble compounds. The precipitates are composed of crystalline or amorphous fine particles. Usually, rare earth oxides are prepared by calcinations of the hydroxide or oxalate gel precipitated from a reaction of an aqueous or alcohol solution of inorganic salt (nitrate, chloride, sulfate, and ammonium nitrate, etc.) with an alkali solution (NaOH, NH4OH, and (NH2)2 H20) or an oxalic acid solution [15-21]. However, it is very difficult to obtain ultrafine particles because of growth and sintering of the particles during the calcinations. 

A co-precipitation method was used to synthesize LU2O3 ultrafine powder, which could be used to fabricate transparent ceramics [12]. Eu-doped LU2O3 powder was prepared by using ammonium hydroxide (NH3-H20) and ammonium hydrogen carbonate (NH4HCO3) as mixed precipitant, from solutions of nitrate salts. The precipitates were calcined at 1000 °C for 2 h, which was the optimized condition to... 

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