某些稀土氧化物的高温高压合成及其结构稳定性研究  

HIGH-PRESSURE AND -TEMPERATURE SYNTHESES AND STRUCTURAL STABILITY STUDIES OF SOME RARE-EARTH OXIDES

作　　者：李强民[1] 苏文辉[1] 龙骧[1] 吴代呜 高忠民[1] 

机构地区：[1]吉林大学

出　　处：《高压物理学报》1989年第1期42-50,共9页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金委员会资助课题

摘　　要：首次用高压高温方法,在3.2～4.0GPa,1000℃～1300℃下,对CeO_2—R_2O_3(R=Eu,Gd),CeO_2—Tb_4O_(11),Pr_6O_(11)—Tb_4O_7 稀土氧化物进行合成实验,得到具有F型结构的CeEuO_(3.5),CeGdO_(3.5),CeTbO_(3.75);B型结构的CeEuO_3,CeGdO_3,CeTbO_3,PrTbO_3 和P型结构的PrTbO_3。PrTbO_3是迄今自然界尚未发现、文献未见报导过的新物质。 对上面的产物和NdYbO_3、PrTmO_3,利用高、低温X射线衍射实验,检测了其结构的稳定性,结果指出:从300℃直到1000℃,发生由B型CeRO_x向F型CeRO_X (R=Eu,Gd,Tb)、B型 PrTbO_3向 C型 PrTbO_3的结构转变。F型CeRO_x属于氧缺位萤石型结构。By using high pressure and temperature method for the first time and under the conditions of 3.2 - 4.0GPa. 1000-1300 ℃. the synthetic experiments for the rare earth oxide systems of CeO2 -R2O3(R=Eu, Gd), CeO2 -Tb4O7,Pr6O11-Tb4O7 were made, and the products of F-CeEuO3.5-CeGdO3.5. -CeTbO3.75;B-CeEuO,, -CeGdO3, -CeTbO, and B-PrTbO3. P-PrTbO, were obtained. The PrTbO, is a new material which has not been discovered in natural world up to date.The structural stability of the above products and NdYbO3. PrTmO3 has been measured by using high and low temperature X -ray powder diffraction method.The results indicated that some structural transformations from B-CeROx to F-CeROx (R= Eu.Gd.Tb) and from B -PrTbO, to C-PrTbO3 occur at the temperature going from 300 ℃ to 1000 ℃. The F-CeRO, belongs to a fluorite-type structure with oxygen deficiency.

关 键 词：稀土 氧化物 合成 结构 稳定性 

分 类 号：O614.330.6[理学—无机化学]