| 黎民红,肖新跃,刘宝刚,周克省*,邓联文.La1-xCexMnO3凝胶晶化过程与微波吸收性能[J].南华大学学报(自然科学版),2012,26(1):48~53.[LI Ming-hong1,XIAO Xin-yue1,LIU Bao-gang2,ZHOU Ke-sheng2*,DENG Lian-wen2.The Gel Crystallization Process and Microwave Absorption Properties of La1-xCexMnO3[J].Journal of University of South China(Science and Technology),2012,26(1):48~53.] |
| La1-xCexMnO3凝胶晶化过程与微波吸收性能 |
| The Gel Crystallization Process and Microwave Absorption Properties of La1-xCexMnO3 |
| 投稿时间：2011-10-19 |
| DOI： |
| 中文关键词: 稀土锰氧化物 La1-xCexMnO3 溶胶—凝胶,晶化 微波吸收 |
| 英文关键词:rare earth manganities La1-xCexMnO3 sol-gel crystallization microwave absorption |
| 基金项目:湖南省自然科学基金资助项目(10JJ5049);衡阳市科技局基金资助项目(2009KG47) |
|
| 摘要点击次数: 910 |
| 全文下载次数: 1366 |
| 中文摘要: |
| 用溶胶—凝胶法制备了La1-xCexMnO3粉体，根据DSC-TGA、FT-IR、XRD分析了样品的晶化过程，用圆柱体法测试了样品的室温电阻率，用微波网络分析仪测试样品的微波吸收性能.结果表明，样品凝胶在煅烧时经过脱水、剧烈分解、逐渐晶化等过程，900℃左右形成稳定的钙钛矿结构并伴有少量CeO2杂相；室温电阻率处于半导体范围，且随掺杂量x增加而减小；样品厚度为2.2 mm、x=0.4时，13.2 GHz频率位置处微波吸收峰值为27 dB,10 dB频宽为3.2 GHz.分析认为，合适的电阻率、钙钛矿晶体极化驰豫及共振、铁磁团簇转向及共振是材料具有良好微波吸收性能的原因. |
| 英文摘要: |
| The powder samples of La1-xCexMnO3 were prepared by sol-gel method and their crystallization process was discussed on the basis of DSC-TGA,XRD and FT-IR.Their conductivities at room temperature and microwave absorption properties were measured respectively by cylinder method and microwave network analyzer.The results show that the gel of La1-xCexMnO3 went through dehydration,severe decomposition and gradual crystallization and transformed into a stable perovskite structure with a small amount of CeO2 impurity phase about 900oC when calcined.The resistivites of the samples were within semiconductor area and reduced with Ce content x increase.The effective absorption bandwidth above 10 dB for La1-xCexMnO3 was 3.2 GHz and the absorption peak was 27dB at 13.2 GHz when the thickness was 2.2 mm and x=0.4.From the analysis,it is believed that appropriate resistivity,polarization relaxation and resonance of perovskite crystal,and turning and resonance of ferromagnetic clusters in the sample under microwave electromagnetic field. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|