Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

您目前所在的位置:首页 - 期刊简介 - 详细页面

中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第18卷    第8期    总第113期    2008年8月

[PDF全文下载]        

    

文章编号:1004-0609(2008)08-1492-06
共沉淀法制备BaHfO3׃Ce纳米粉体及发光性能
刘 晶1, 3,马伟民1,闻 雷2,李喜坤3,沈世妃4 郭易芬4

(1. 沈阳化工学院 材料科学与工程学院,沈阳 110142;
2. 中国科学院金属研究所 沈阳材料科学国家(联合)实验室,沈阳 110016;
3. 沈阳理工大学 材料工程学院,沈阳 110168;
4. 沈阳大学 材料科学与工程系,沈阳 110044
)

摘 要: 研究以草酸和氨水作为沉淀剂制备BaHfO3׃Ce纳米粉体的工艺。用XRDTEM等测试技术,分析不同沉淀剂对粉体合成中的物相变化、形貌及Ce3+掺杂量对粉体激发光谱和发射光谱的影响。结果表明:以氨水做沉淀剂在900 ℃煅烧2 h合成的BaHfO3׃Ce粉体形貌近似球形,平均粒径约15 nm。用草酸做沉淀剂、合成温度为1 000 ℃时其粉体形貌呈多边形,粒径约60 nm。微量Ce3+的掺杂不改变BaHfO3的晶体结构。Ce3+掺杂量(摩尔分数)0.3%BaHfO3发射光谱相对峰强度最高,当Ce3+掺杂量大于0.3%时出现浓度淬灭现象。粉体的激发和发射光谱均存在较宽的谱带,主要由激活Ce3+5d→2F5/25d→2F7/2宽带能级跃迁产生。

 

关键词: BaHfO3׃Ce粉体;共沉淀法;Ce3+掺杂量;光谱特性

Preparation and spectrum characteristics of BaHfO3׃Ce nano-powder by co-precipitation
LIU Jing1. 3, MA Wei-min1, WEN Lei2, LI Xi-kun3, SHEN Shi-fei4, GUO Yi-fen4

1. School of Materials Science and Engineering, Shenyang Institute of Chemical Technology, Shenyang 110142, China;
2. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences,Shenyang 110016, China;
3. School of Materials and Engineering, Shenyang Technology University, Shenyang 110168,China;
4. Department of Materials Science and Engineering, Shenyang University, Shenyang 110044, China

Abstract: The processing technology of Ce doped-BaHfO3 nano-powders that is prepared by co-precipitation (with oxalic acid and ammonia as the precipitant, respectively) was investigated. XRD and TEM were employed to analyze the effects of different precipitates on the phase change, morphologies of powders and influences of Ce3+ dopant content on the excitation and emission spectra of powders. The results show that spherical BaHfO3׃Ce nano-powders are synthesized only at 900 ℃ for 2 h and the average diameter is about 15 nm with ammonia as precipitant. But using oxalic acid as precipitant, the powders have polygonal morphology after calcining at 1 000 ℃ for 2 h and the average diameter is about 60 nm. Minor Ce3+ has no effect on the crystal structure. The relative intensity of photoluminescence peak has the maximum value when the Ce3+ dopant content is 0.3% (mole fraction). The concentration quench occurs when the Ce3+ dopant content exceeds 0.3%. The emission character is resulted from 5d→2F5/2 and 5d→2F7/2 transitions of Ce3+ and both the excitation and emission spectra are wide band.

 

Key words: BaHfO3׃Ce powder; co-precipitation; Ce3+ dopant content; spectrum characteristics

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

主管:中国科学技术协会 主办:中国有色金属学会 承办:中南大学
湘ICP备09001153号 版权所有:《中国有色金属学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市岳麓山中南大学内 邮编:410083
电 话:0731-88876765,88877197,88830410   传真:0731-88877197   电子邮箱:f_ysxb@163.com