摘要
采用金属硝酸盐和助燃剂尿素通过低温燃烧反应成功制备了Ni0.25Mn0.25Zn0.50Fe2O4铁氧体,通过热重和XRD分析了在不同的热处理温度下,制备样品的反应过程。铁氧体的微观形貌通过TEM进行表征,在室温条件下通过矢量网络分析仪测试了从2 GHz到8 GHz的微波吸收性能。结果表明,通过燃烧反应的粉体加热到400℃保温6 h制备出高纯度的Ni0.25Mn0.25Zn0.50Fe2O4铁氧体,颗粒为不规则的片状,晶粒尺寸约为20 nm。在厚度为4 mm时,微波频段从5 GHz到8 GHz反射率小于-10 dB,在频率为7.96 GHz时,达到最小反射率-30.75 dB。
Ni0. 25Mn0. 25Zn0. 50Fe2O4 ferrite was successfully synthesized through low temperature combustion reaction using metal nitrates and urea as fuel. Differential scanning calorimetry （DSC） and thermogravimetric analysis （TGA）, as well as the X-ray diffraction patterns （XRD） of the resultant powders heat treated at different temperatures were used to analyze the formation process of the Ni0. 25Mn0. 25Zn0. 50Fe2O4 ferrite. The microstructure was tested by the transmission electron microscopy （TEM）, and the microwave absorption property in the frequency from 2 GHz to 8 GHz was investigated at room temperature by network analyzer. The results showed that highly pure Ni0. 25Mn0. 25Zn0. 50Fe2O4 ferrite powders could be synthesized when the powders from the combustion reaction were heat treated at 400℃ for 6 h. The as fabricated particles are irregular flake with a crystallite size of -20 nm. At a thickness of 4 mm, the reflection rate of less than - 10 dB was from 5 GHz to 8 GHz. In the frequency of 7.96 GHz, the minimum reflection rate was -30.75 dB.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2013年第12期2615-2619,共5页
Journal of Synthetic Crystals
基金
国家自然科学基金(0902090
50802057)
陕西省自然科学基金(2009JQ6006)
