溶胶-凝胶自燃烧法合成镧掺杂钡铁氧体纳米粉体及其吸波性能研究

稀有金属, 2015, 39(8): 715-719. doi: 10.13373/j.cnki.cjrm.2015.08.007

溶胶-凝胶自燃烧法合成镧掺杂钡铁氧体纳米粉体及其吸波性能研究

张兴凯 ^1, , 王绳芸 ^2, , 张健 ^3, , 张棚 ^4, , 刘俊亮 ^5, , 张明 ^6,

1.扬州大学化学化工学院,江苏扬州,225002

2.扬州大学化学化工学院,江苏扬州,225002

3.扬州大学化学化工学院,江苏扬州,225002

4.扬州大学化学化工学院,江苏扬州,225002

5.扬州大学化学化工学院,江苏扬州,225002

6.扬州大学化学化工学院,江苏扬州225002;扬州大学测试中心,江苏扬州225009

基金项目: 江苏省高校自然科学基金项目(10KJB430018)资助国家自然科学基金项目(51103125,51273172)

关键词：钡铁氧体 , 镧掺杂 , 纳米粉体 , 溶胶-凝胶自燃烧 , 吸波性能

Synthesis and Microwave Absorbing Properties of La-Doped Barium Ferrite Nano Powders via Sol-Gel Auto-Combustion Method

Keywords： barium ferrite , La-doping , nano powders , sol-gel auto-combustion , microwave absorbing properties

采用溶胶-凝胶自燃烧法合成镧掺杂六角钡铁氧体(LaxBa1-xFe12O19)纳米粉体,细致研究了镧掺杂量对所合成六角钡铁氧体纳米粉体物相形成、颗粒尺寸以及电磁特性等的影响.结果表明:随着镧掺杂量的提高,获得纯相掺杂铁氧体粉体的热处理温度提高,当热处理温度为1000℃时,所得纯相镧掺杂六角铁氧体粉体Ba位La掺杂量x(摩尔分数)可达0.20;镧元素掺杂抑制了后续热处理过程中晶粒长大,对于所合成产物的颗粒呈现出一定细化作用,这在较高热处理温度下更为明显;镧掺杂改性六角钡铁氧体的吸波效率与吸波频带随着镧掺杂量的提高而改变;当镧掺入量x为0.15时,所得镧掺杂六角钡铁氧体/石蜡混合物具有良好的吸波性能:在厚度为2 mm时其最高吸收损耗达-15 dB,吸收损耗高于-10 dB的吸收频带为13～ 16 GHz,频带宽度为3 GHz.

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