用共沉淀法合成烧绿石型氧化物Y_2Sn_2O_7的过程研究

Studies of the Forming Process of Pyrochlore-type Complex Oxide by Coprecipitating Method

本文用 TG—DTA,IR,Raman 和 XRD 等手段研究了共沉淀法合成烧绿石型复合氧化物 Y_2Su_2O_7的过程.实验结果表明,溶液中 Y^(3+)和 SnCl_6^(2-)离子可能同时沉淀,各自形成微晶,随后相互作用形成复合胶体微晶,形成共沉淀的初始产物 YSn_2.它的 X 射线衍射是非晶态的.对YSn_2进行热处理时,Y 和 Sn 的氧化物发生固体反应.最后生成烧绿石型复合氧化物 Y_2Sn_2O_7粉晶.

In this paper we have discussed the forming process of thepyrochlore-type complex oxide upon coprecipitating the Y^(3+)andSnCl_6^(2-)by TG-DTA.IR,Raman and XRD.The experimental resultsshow the Y^(3+)and SnCl_6^(2-)may probably precipitateto form microcrystals,respectively.Then by interaction they convert into ultimate complexcolloidal particles.YSn_2,which is coprecipitating precursor and is non-crystalline.The relative oxide urdergoes a solid-state reaction on heattreating YSn_2 to produce microcrystals of the Y_2Sn_2O_7.