Y_(2-x)Sm_xW_3O_(12)固溶体的制备及热膨胀性能研究  

Thermal Expansion Properties of Solid Solution Y_(2-x)Sm_xW_3O_(12)

作　　者：杨海涛[1] 刁志聪[1] 尚福亮[1] 林伟林[1] 高玲[1] 

机构地区：[1]深圳大学材料学院深圳市特种功能材料重点实验室,广东深圳518060

出　　处：《中国钨业》2010年第5期40-43,共4页China Tungsten Industry

基　　金：深圳大学科研启动基金资助(200827)

摘　　要：采用二次固相反应法成功制备出Y2-xSm(xWO4)(3x=0.0,0.2)、(x=1.0,1.4,1.8,2.0)系列固溶体,低掺杂量Y2-xSm(xWO4)(3x=0.0,0.2)为单斜结构(空间群:P2/m),高掺杂量Y2-xSm(xWO4)(3x=1.0,1.4,1.8,2.0)为单斜结构(空间群:C2/c);热重分析表明低Sm掺杂Y2-xSm(xWO4)3具吸水性,且随Sm含量增加而含水量减少,当x≥1.0时,样品完全不吸水;SEM分析了样品的断口形貌与晶粒尺寸;热膨胀性能测试表明,Sm掺杂量(x=0.0,0.2)的Y2-xSm(xWO4)3排除水分子后,具有较强的负热膨胀特性,而掺杂量(x=1.0,1.4,1.8,2.0)的Y2-xSm(xWO4)3具有正膨胀性能。A new series of solid solution Y2-xSmx（WO4）3（x=0.0,0.2）,（x=1.0,1.4,1.8,2.0） have been successfully synthesized by the secondary Solid-state method.The low-doped Y2-xSmx（WO4）3（x = 0.0,0.2） is the monoclinic structure（space group： P2 / m）,and the high-doped Y2-xSm（xWO4）3（x=1.0,1.4,1.8,2.0） is the monoclinic structure（space group： C2 / c）;Thermogravimetric analysis showed that the Y2-xSmx（WO4）3（x=0.0,0.2,0.6,0.8） with water absorption and the compound stores less water with increase Sm content,and found that when x≥1.0,sample completely non-absorbent;The fracture morphology and grain size of samples analysis by SEM;Thermal expansion studies show that,the Sm doping（x =0.0,0.2） of the Y2-xSmx（WO4）3 excluded crystal water,has a strong negative thermal expansion properties.The doping（x =1.0,1.4,1.8,2.0） of the Y2-xSmx（WO4）3 has a positive expansion performance.

关 键 词：Y2-xSm(xWO)3固溶体 X射线衍射分析 热膨胀性能研究 

分 类 号：O614[理学—无机化学]