制备方法与Ce^(3+)对二水硫酸钙晶须形貌的影响  

Effect of Preparation Method and Ce^(3+)on the Morphology of Calcium Sulfate Dihydrate Whiskers

作　　者：吴锦绣[1,2,3] 秦思成 牛小超 齐源昊 柳召刚 胡艳宏[1,2,3] 冯福山 李健飞[1,2,3] 张晓伟 WU Jinxiu;QIN Sicheng;NIU Xiaochao;QI Yuanhao;LIU Zhaogang;HU Yanhong;FENG Fushan;LI Jianfei;ZHANG Xiaowei(School of Materials and Metallurgy,Inner Mongolia University of Science and Technology,Baotou 014010,China;Key Laboratory of Inner Mongolia Autonomous University on New Technologies of Modern Metallurgy and Application of Rare Earth,Baotou 014010,China;Key Laboratory of Green Extraction and Efficient Utilization of Light Rare-Earth Resources,Ministry of Education,Baotou 014010,China)

机构地区：[1]内蒙古科技大学材料与冶金学院,包头014010 [2]内蒙古自治区高校稀土现代冶金新技术与应用重点实验室,包头014010 [3]轻稀土资源绿色提取与高效利用教育部重点实验室,包头014010

出　　处：《人工晶体学报》2023年第9期1720-1729,共10页Journal of Synthetic Crystals

基　　金：国家自然科学基金(51965053);内蒙古自然科学基金(2022LHMS05022);高校科研费(242,302)。

摘　　要：本文以稀土石膏为原材料研究了制备方法对硫酸钙晶须(CSW)形貌和结构的影响,并以二水硫酸钙(分析纯)为原材料,CeCl_(3)·7H_(2)O为铈源,探究稀土铈的加入对CSW的结构和形貌的影响。利用SEM、XRD、XPS和FL等表征手段对CSW的结构、形貌和组成及其荧光性能等进行表征和分析。研究结果表明:采用微波法可以制备高长径比的CSW,其平均长度为263μm,平均长径比为39.50。Ce^(3+)以原子置换的形式进入CSW,对晶须的晶体结构不产生影响,但改善了CSW的形貌。添加2%(质量分数)的Ce^(3+)能够促进晶须向一维生长,使得CSW的长径比显著增加,而过量的Ce^(3+)会促使晶须横向生长。研究证明稀土石膏中含有微量的稀土元素Ce,同时发现由稀土石膏制备的CSW具有发射蓝光的特性,这对开发利用稀土石膏具有重要的理论指导意义。The calcium sulfate dihydrate whiskers(CSW)were prepared using rare earth gypsum as raw material,and the effects of preparation methods on the morphology and structure of CSW were studied.The effect of rare earth cerium on the structure and morphology of CSW was investigated using pure calcium sulfate dihydrate as raw material and CeCl_(3)·7H_(2)O as cerium source.The structure,morphology,composition,and fluorescence properties of CSW were characterized and analyzed by SEM,XRD,XPS and FL.The results show that calcium sulfate dihydrate whiskers with high aspect ratio can be prepared by microwave method,with average length of 263μm and average aspect ratio of 39.50.Ce^(3+)enters CSW in the form of atomic substitution during the formation of CSW,which does not affect the crystal structure of CSW,but improves the morphology of CSW.When 2%(mass fraction)Ce^(3+)is added,one-dimensional growth of CSW is promoted to make the aspect ratio of CSW increase significantly,while excessive Ce^(3+)leads to the growth of whiskers in the transverse direction.This study proves that rare earth gypsum contains trace amounts of rare earth element Ce.At the same time,it is found that CSW prepared from rare earth gypsum presents the characteristics of emitting blue light,which provides theoretical guidance for the development and utilization of rare earth gypsum.

关 键 词：稀土铈 稀土石膏 硫酸钙晶须 微波法 长径比 荧光性能 

分 类 号：TQ132.32[化学工程—无机化工]