| La_(0.8)Sr_(0.2)Mn_(0.98-x)Fe_xCo_(0.02)O_3微波吸收特性研究 |
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| 引用本文： | 贝承训,王达.La_(0.8)Sr_(0.2)Mn_(0.98-x)Fe_xCo_(0.02)O_3微波吸收特性研究[J].安徽大学学报(自然科学版),2010,34(5). |
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| 作者姓名： | 贝承训 王达 |
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| 作者单位： | 华南理工大学,材料科学与工程学院,广东,广州,510006 |
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| 基金项目： | 广东省自然科学基金资助项目 |
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| 摘 要： | 用溶胶-凝胶法制备La_(0.8)Sr_(0.2)Mn_(0.98-x)Fe_xCo_(0.02)O_3(x=0.08、0.10、0.12、0.14)晶粉,用场发射扫描电子显微镜和XRD表征其微观形貌和晶体结构,用微波网络矢量分析仪测量样品在2~18 GHz频率范围内的复介电常数和复磁导率,根据测量数据计算微波反射率与频率的关系曲线.研究结果表明:900℃煅烧3 h的La_(0.8)Sr_(0.2)Mn_(0.98-x)Fe_xCo_(0.02)O_3粉晶平均粒径约100 nm,晶体结构为钙钛矿型;在测试范围内,样品都有一个吸收峰,峰高及频率位置随x不同而异;厚度2 mm,x=0.08、0.10、0.14,大于10dB的吸收带宽达到4 GHz以上,样品既有介电损耗又有磁损耗,但介电损耗要大于磁损耗.
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| 关 键 词： | 微波吸收材料 介电损耗 掺杂 溶胶-凝胶法 |
Absorbing properties of La_(0.8)Sr_(0.2)Mn_(0.98-x)Fe_xCo_(0.02)O_3 |
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| BEI Cheng-xun,WANG Da.Absorbing properties of La_(0.8)Sr_(0.2)Mn_(0.98-x)Fe_xCo_(0.02)O_3[J].Journal of Anhui University(Natural Sciences),2010,34(5). |
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| Authors: | BEI Cheng-xun WANG Da |
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| Institution: | BEI Cheng-xun,WANG Da(School of Materials Science , Engineering,South China University of Technology,Guangzhou 510006,China) |
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| Abstract: | La_(0.8)Sr_(0.2)Mn_(0.98-x)Fe_xCo_(0.02)O_3(x=0.08,0.10,0.12,0.14)particles were synthesized by sol-gel process,the crystal structure and morphology were characterized by XRD and STEM,respectively.The complex permittivity and permeability were determined by microwave vector network analyzer in the frequency range of 2 to 18 GHz.The relationship between reflection coefficient and microwave frequency was calculated based on measured data.The results showed that the average diameter of La0.8Sr0.2Mn0.88Fe0.10Co... |
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| Keywords: | microwave absorption material complex permittivity doped sol-gel |
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