稀土
稀土
희토
CHINESE RARE EARTHS
2009年
6期
35-38
,共4页
纳米晶%La_2O_3%沉淀法%晶粒度
納米晶%La_2O_3%沉澱法%晶粒度
납미정%La_2O_3%침정법%정립도
nanocrystalline%La_2O_3%chemical precipitation%grain size
以La(NO_3)_3·6H_2O、NH_4HCO_3和聚乙二醇为原料,利用沉淀法制备了纳米La_2O_3粉体,利用XRD,TG-DTA和TEM等测试方法对干凝胶热分解过程及最终形成的纳米La_2O_3粉体进行了分析和表征,XRD法考察了前驱体在不同热处理条件下产物物相和晶粒度的变化情况,实验结果表明,在适当工艺参数下,前驱体经720℃,1h焙烧所得产物为平均粒径小于50nm的La_2O_3粉体.
以La(NO_3)_3·6H_2O、NH_4HCO_3和聚乙二醇為原料,利用沉澱法製備瞭納米La_2O_3粉體,利用XRD,TG-DTA和TEM等測試方法對榦凝膠熱分解過程及最終形成的納米La_2O_3粉體進行瞭分析和錶徵,XRD法攷察瞭前驅體在不同熱處理條件下產物物相和晶粒度的變化情況,實驗結果錶明,在適噹工藝參數下,前驅體經720℃,1h焙燒所得產物為平均粒徑小于50nm的La_2O_3粉體.
이La(NO_3)_3·6H_2O、NH_4HCO_3화취을이순위원료,이용침정법제비료납미La_2O_3분체,이용XRD,TG-DTA화TEM등측시방법대간응효열분해과정급최종형성적납미La_2O_3분체진행료분석화표정,XRD법고찰료전구체재불동열처리조건하산물물상화정립도적변화정황,실험결과표명,재괄당공예삼수하,전구체경720℃,1h배소소득산물위평균립경소우50nm적La_2O_3분체.
Nanocrystalline La_2O_3 was prepared by chemical precipitation process using La(NO_3)_3·6H_2O,NH_4HCO_3 and PEG.The decomposition process of xerogelspowder and the calcened nanocrystalline La_2O_3 formed at the end were characterized by XRD,TG-DTA and TEM. The component and size of the product were characterized by X-ray diffraction (XRD) under different conditions of heat treatment. The result shows that the nanocrystalline La_2O_3 can be obtained with average particle diameter of 50nm under appropriate conditions.
