烧结温度对LaCrO_3陶瓷介电性能的影响
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摘要
采用La_2O_3和Cr_2O_3为原料,固相法制备了LaCrO_3陶瓷粉末,并在不同烧结温度下得到LaCrO_3陶瓷,通过X射线衍射分析仪、扫描电镜及介电频谱仪对其物相、微结构及介电性能进行了研究。结果表明:1 200℃烧结4 h,LaCrO_3陶瓷的致密度最佳,其颗粒尺寸约为1μm～2μm。随着烧结温度增加,LaCrO_3陶瓷的介电常数和介电损耗随频率增大而减小,这可能归因于纯LaCrO_3陶瓷中的氧空位难以形成,氧空位数非常少。
Using La_2O_3 and Cr_2O_3 as raw materials, LaCrO_3 powder was synthesized by the traditional solid state method, and LaCrO_3 ceramics were obtained sintered at different temperatures. The phase, microstructure and dielectric properties of the samples were analyzed by X-ray diffraction(XRD), scanning electron microscope(SEM), and dielectric spectrometer. The results showed that the maximum density of sample was obtained as it was sintered at temperature of 1 200℃ for 4 h, its particle size was about 1～2 μm. Its permittivity and dielectric loss of samples were constantly decreased with the calcination temperature increased. It maybe ascribed to the difficulty of the forming oxygen vacancies in pure strontium chromate ceramics and fewoxygen vacancies.
Using La_2O_3 and Cr_2O_3 as raw materials, LaCrO_3 powder was synthesized by the traditional solid state method, and LaCrO_3 ceramics were obtained sintered at different temperatures. The phase, microstructure and dielectric properties of the samples were analyzed by X-ray diffraction(XRD), scanning electron microscope(SEM), and dielectric spectrometer. The results showed that the maximum density of sample was obtained as it was sintered at temperature of 1 200℃ for 4 h, its particle size was about 1～2 μm. Its permittivity and dielectric loss of samples were constantly decreased with the calcination temperature increased. It maybe ascribed to the difficulty of the forming oxygen vacancies in pure strontium chromate ceramics and fewoxygen vacancies.
引文
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[2]王峰,孙良成,白洋,等.掺杂CaCO3及B4C对铬酸镧陶瓷连接体的影响[J].中国稀土学报,2013(2):234-241.
[3]杨国平,李胜利,杨国明,等.掺锂对铬酸镧粉合成的影响[J].金属热处理,2005(11):3.
[4]梁丽萍,高荫本,陈诵英.固体氧化物燃料电池与材料[J].材料科学与工程,1997,15(4):6.
[5]丁锡锋,高凌,陈涵,等.LaCrO_3基陶瓷材料在SOFC中的研究进展[J].材料导报,2006(20):29-33.
[6]廖花妹,罗凌虹,吴也凡,等.SOFC连接材料掺杂铬酸镧粉体(下转第41页)的合成[J].陶瓷学报,2010(3):377-380.
[7]董相廷,郭奕柱,于德才,等.LaCrO_3纳米粉末的合成及电性质[J].材料研究学报,1994(3):263-266.
[8]郭少璞,毛耀文,王瑞龙,等.LaCrO_3陶瓷的高压制备、结构和磁性研究[J].湖北工程学院学报,2017(37):51-55.
[9]李胜利,李士刚,孙良成,等.铬酸镧电热管素坯制备的关键技术研究[J].金属热处理,2007(6):38-40.
[10]刘永杰,孙杰璟,高露,等.添加物对LaCrO_3材料烧结的影响[J].耐火材料,2007(6):422-439.(上接第37页)
[11]李胜利,刘伟明,孙良成,等.铬酸镧材料的微结构研究[J].中国稀土学报,2003(2):244-246.
[12]纪元,孙良成,杨忠贤.铬酸镧/氧化铝复合材料的烧结机制与性能[J].稀土,2010(5):28-32.
[13]Oikawa K.Hashimoto T.Shimojyo Y.et al.Structural phase transition of orthorhombic LaCrO_3 studied by neutron powder diffraction[J].International Journal of Quantum Chemistry,2000,2(2):524-529.
[14]朱新德,李胜利,孙良成,等.掺钙的铬酸镧粉末制备工艺及烧结性能研究[J].金属热处理,2007(6):79-81.