高Q值(1-x)(Sr0.2Nd0.208Ca0.488)TiO3-xNd(Ti0.5Mg0.5)O3微波陶瓷的微结构及介电性能研究

doi:10.15541/jim20150155

无机材料学报 ›› 2015, Vol. 30 ›› Issue (11): 1213-1217.DOI: 10.15541/jim20150155

高Q值(1-x)(Sr_0.2Nd_0.208Ca_0.488)TiO₃-xNd(Ti_0.5Mg_0.5)O₃微波陶瓷的微结构及介电性能研究

屈婧婧¹, 魏星¹, 经本钦¹, 刘飞², 袁昌来²

(1. 桂林航天工业学院, 桂林 541004; 2. 桂林电子科技大学, 桂林 541004)

收稿日期:2015-04-01 修回日期:2015-04-27 出版日期:2015-11-20 网络出版日期:2015-10-20
作者简介:屈婧婧(1988–), 女, 硕士研究生. E-mail: qujingjing@guat.edu.cn
基金资助:
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

Microstructure and Microwave Dielectric Property of (1-x)(Sr_0.2Nd_0.208Ca_0.488)TiO₃-xNd(Ti_0.5Mg_0.5)O₃ Ceramics with High Quality Factor

QU Jing-Jing¹, WEI Xing¹, JING Ben-Qin¹, LIU Fei², YUAN Chang-Lai²

(1. Guilin University of Aerospace Technology, Guilin 541004, China; 2. Guilin University of Electronic Technology, Guilin 541004, China)

Received:2015-04-01 Revised:2015-04-27 Published:2015-11-20 Online:2015-10-20
About author:QU Jing-Jing. E-mail: qujingjing@guat.edu.cn
Supported by:
Guangxi Natural Science Funds(2014GXNSFBA118286);National Natural Science Foundationof China(11464006);The Department of Education Scientific Research Project of Guangxi(YB2014433);Fund Project of Guilin University of Aerospace Technology (YJ1410);The Funding Achievement of the Project of Outstanding Young and Middle-aged Excellent Teachers' Training in Higher Education Institutions of Guangxi

摘要/Abstract

摘要：

采用固相法制备了(1-x)(Sr_0.2Nd_0.208Ca_0.488)TiO₃-xNd(Ti_0.5Mg_0.5)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(ε_r)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(τ_f)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: ε_r=50.1, Q×f =44910 GHz, τ_f= -1.7×10^-6/℃。

关键词: (Sr0.2Nd0.208Ca0.488)TiO3, Nd(Ti0.5Mg0.5)O3, 钙钛矿, 微波介电性能

Abstract:

(1-x)(Sr_0.2Nd_0.208Ca_0.488)TiO₃-xNd(Ti_0.5Mg_0.5)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 (ε_r) decreased, while the quality factor (Q×f) effectively improved, and the temperature coefficient of resonant frequencies (τ_f) gradually shifted to negative direction. An optimized microwave dielectric properties with ε_r~ 50.1, Q×f ~ 44, 910 GHz and τ_f~ -1.7×10^-6/℃ could be obtained for the ceramics with x = 0.35 after being sintered at 1520℃ for 4 h.

Key words: (Sr0.2Nd0.208Ca0.488)TiO3, Nd(Ti0.5Mg0.5)O3, perovskite, microwave dielectric properties

中图分类号:

TM277

屈婧婧, 魏星, 经本钦, 刘飞, 袁昌来. 高Q值(1-x)(Sr_0.2Nd_0.208Ca_0.488)TiO₃-xNd(Ti_0.5Mg_0.5)O₃微波陶瓷的微结构及介电性能研究[J]. 无机材料学报, 2015, 30(11): 1213-1217.

QU Jing-Jing, WEI Xing, JING Ben-Qin, LIU Fei, YUAN Chang-Lai. Microstructure and Microwave Dielectric Property of (1-x)(Sr_0.2Nd_0.208Ca_0.488)TiO₃-xNd(Ti_0.5Mg_0.5)O₃ Ceramics with High Quality Factor[J]. Journal of Inorganic Materials, 2015, 30(11): 1213-1217.

图/表 5

图1 SNCT-NTMx(0.3≤x≤0.4)陶瓷1520℃烧结4 h的XRD图谱

Fig. 1 XRD patterns of SNCT-NTMx(0.3≤x≤0.4) specimens sintered at 1520℃ for 4 h The inset represents the enlarged figures of the (121) peaks

表1 1520℃保温4 h烧结的SNCT-NTMx(0.3≤x≤0.4)陶瓷晶格常数、晶胞体积及介电性能

Table 1 Lattice parameters, unit cell volume and dielectric properties of the SNCT-NTMx (0.3≤ x ≤0.4) ceramics sintered at 1520℃ for 4 h

x	a /nm	b / nm	c/ nm	Unit cell volume/nm³	ε_r	Q×f/GHz	τ_f /(×10^-6,℃^-1 )
0.3	0.54593	0.77355	0.54090	0.22842	55.2	35090	9.2
0.35	0.54624	0.77367	0.54211	0.22910	50.1	44910	-1.7
0.4	0.54647	0.77221	0.54901	0.23171	47.1	46290	-18.2

图2 1520℃保温4 h烧结的SNCT-NTMx(0.3≤x≤0.4)样品喷金后的SEM照片(a-c)及EDS图谱(d,e)

Fig. 2 Surface SEM images (a-c) and EDS patterns (d,e) of the SNCT-NTMx (0.3≤x≤0.4) specimens sintered at 1520℃ for 4 h

图3 SNCT-NTMx(0.3≤x≤0.4)陶瓷的体积密度随烧结温度的变化

Fig. 3 Bulk density of the SNCT-NTMx (0.3≤x≤0.4) ceramics as a function of sintering temperature

图4 SNCT-NTMx(0.3≤x≤0.4)陶瓷εr(a)和Q×f (b)值随烧结温度的变化

Fig. 4 Dielectric constant (a) and Q×f (b) value of the SNCT-NTMx (0.3≤x≤0.4) ceramics as a function of sintering temperature

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高Q值(1-x)(Sr_0.2Nd_0.208Ca_0.488)TiO₃-xNd(Ti_0.5Mg_0.5)O₃微波陶瓷的微结构及介电性能研究

Microstructure and Microwave Dielectric Property of (1-x)(Sr_0.2Nd_0.208Ca_0.488)TiO₃-xNd(Ti_0.5Mg_0.5)O₃ Ceramics with High Quality Factor

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