溶液燃烧法制备Mg_2B_2O_5亚微米棒

Preparation of Mg_2B_2O_5 Submicron Rods by Solution Combustion Method

以六水硝酸镁、硼酸、甘氨酸、尿素为原料,运用溶液燃烧法合成了Mg2B2O5亚微米棒。利用XRD,SEM,TGDTA表征手段对产物及产物前驱体进行表征。讨论了不同温度、燃烧剂、Mg∶B比例和煅烧时间对产物的物相、形貌的影响。确定合成Mg2B2O5亚微米棒的最佳工艺条件为甘氨酸做燃烧剂、Mg∶B=1∶1、在900℃煅烧4 h,得到的产物呈棒状,直径分布在200~400 nm之间,长径比分布在3~6之间。

Using six hydrated magnesium nitrate,boric acid,glycine,carbamide as raw materials,Mg2B2O5 submicron rods were prepared by solution combustion method. Product and product precursor were characterized by XRD, SEM, TG-DTA. The effects of different temperatures, combustions（ reducing agents）,Mg∶ B ratios and calcination time on the product phase and morphology were discussed. Finally the best condition of preparation of submicron rods Mg2B2O5 was confirmed which can be summerized as follows： glycine as combustion agents,Mg∶ B = 1∶ 1 under 900 ℃ and calcination 4 h.Under the condition,submicron rods Mg2B2O5 were prepared. The diameter distributes from 200 nm to400 nm. The ratio of length and diameter distributes from 3 to 6.