摘要
采用固相法制备了（1–x）（Sr0.2Nd0.208Ca0.488）Ti O3-x Nd（Ti0.5Mg0.5）O3（0.3≤x≤0.4,SNCT-NTMx）系微波介质陶瓷材料,并研究了该体系的相组成、显微结构、烧结性能和微波介电性能之间的关系。结果表明：在x=0.3~0.35范围内,SNCT-NTMx陶瓷形成了正交钙钛矿固溶体,并伴随有少量未知第二相;当x增至0.4时,第二相含量有所增加。介电性能研究结果显示：随着x的增加,体系介电常数（εr）减小,但品质因子（Q×f）得到改善;此外,体系谐振频率温度系数（τf）随NTM含量的增加逐渐向负值方向移动。当x=0.35,陶瓷样品在1520℃烧结4 h得到的微波介电性能较优：εr=50.1,Q×f=44910 GHz,τf=–1.7×10-6/℃。
（1-x）（Sr0.2Nd0.208Ca0.488）Ti O3-x Nd（Ti0.5Mg0.5）O3（0.3≤ x ≤0.4, SNCT-NTMx） ceramics were prepared by solid sate reaction technique. In addition, the crystal structure, microstructures, sintering properties, and microwave dielectric properties of the SNCT-NTMx ceramics were investigated. These results showed that an orthorhombic perovskite structure with a minor amount of unknown secondary phase was formed in the ceramics with the compositions of 0.3≤ x ≤0.35. Additionally, the content of the second phase gradually increased with increasing x value to 0.4. For the SNCT-NTMx ceramics with an increase in NTM content, the dielectric constant（εr） decreased, while the quality factor（Q×f） effectively improved, and the temperature coefficient of resonant frequencies（τf） gradually shifted to negative direction. An optimized microwave dielectric properties with εr ~ 50.1, Q×f ~ 44, 910 GHz and τf ~ –1.7×10-6/℃ could be obtained for the ceramics with x = 0.35 after being sintered at 1520℃ for 4 h.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2015年第11期1213-1217,共5页
Journal of Inorganic Materials
基金
广西自然科学基金(2014GXNSFBA118286)
国家自然科学基金(11464006)
广西壮族自治区教育厅科研项目(YB2014433)
桂林航天工业学院院级基金(YJ1410)
广西优秀中青年骨干教师培养工程~~
