B位(Mg1/3Ta2/3)4+置换对新型Sr基(Sr, Nd, Ca)TiO3微波陶瓷结构及介电性能的影响

doi:10.15541/jim20160317

无机材料学报 ›› 2017, Vol. 32 ›› Issue (3): 293-298.DOI: 10.15541/jim20160317

B位(Mg_1/3Ta_2/3)⁴⁺置换对新型Sr基(Sr, Nd, Ca)TiO₃微波陶瓷结构及介电性能的影响

屈婧婧¹, 魏星¹, 宋小辉¹, 袁昌来², 刘飞³

(1. 桂林航天工业学院计算机科学与工程系, 桂林 541004；2. 桂林电子科技大学材料科学与工程学院, 桂林 541004; 3. 桂林电子科技大学机电工程学院, 桂林 541004)

收稿日期:2016-05-13 修回日期:2016-07-27 出版日期:2017-03-20 网络出版日期:2017-02-24
作者简介:屈婧婧(1988–), 女, 硕士研究生, 讲师. E-mail: qujingjing@guat.edu.cn
基金资助:
广西自然科学基金 (118286);国家自然科学基金 (11464006);广西高校中青年教师基础能力提升项目(KY2016YB534)

B-site Substitution by (Mg_1/3Ta_2/3)⁴⁺ on Structures and Dielectric Properties of New Sr-based (Sr, Nd, Ca)TiO₃ Microwave Ceramics

QU Jing-Jing¹, WEI Xing¹, SONG Xiao-Hui¹, YUAN Chang-Lai², LIU Fei³

(1. Guilin University of Aerospace Technology, Department of Computer Science and Engineering, Guilin 541004, China; 2. Guilin University of Electronic Technology, School of Material Science and Engineering, Guilin 541004, China; 3. School of Mechanical and Electrical Endineering, Guilin University of Electronic Techonology, Guilin 541004, China)

Received:2016-05-13 Revised:2016-07-27 Published:2017-03-20 Online:2017-02-24
About author:QU Jing-Jing. E-mail: qujingjing@guat.edu.cn
Supported by:
Natural Science Funds of Guang Xi Province (118286);National Natural Science Foundation of China (11464006);Middle-aged and Yong Teachers of the College and/or Universities for Basic Ability Promotion Project in Guang Xi Province (KY2016YB534)

摘要/Abstract

摘要：

采用固相反应法合成了(Sr_0.2Nd_0.208Ca_0.488)Ti_1-_x(Mg_1/3Ta_2/3)_xO₃(0.2≤x≤0.5, SNCTMTx)系微波介质陶瓷, 分析了SNCTMTx (0.2≤x≤0.5)陶瓷的相组成、显微结构、烧结特性和微波介电性能之间的关系。XRD晶体结构分析表明: 当x=0.2时, SNCTMTx陶瓷为单一正交钙钛矿结构, 当x值增为0.3~0.5时, 陶瓷体呈现正交钙钛矿相、SrO与未知相多相共存状态。随着(Mg_1/3Ta_2/3)⁴⁺含量的增加, 体系中第二相的出现及含量的改变导致ε_r先增后减, 而Q×f值出现先降后升的原因是B位离子1:2有序度的出现与范围的增加抑制了第二相进一步恶化品质因子;此外, τ_f逐渐向近零方向偏移与氧八面体的畸变程度密切相关。当x=0.5时, 在1530℃烧结4 h得到的SNCTMTx陶瓷微波介电性能较优: ε_r=55.3, Q×f ≈7400 GHz, τ_f ≈23.6×10^-6/℃。

关键词: 钙钛矿, (Mg1/3Ta2/3)4+, 微波介电性能, (Sr0.2Nd0.208Ca0.488)TiO3

Abstract:

(Sr_0.2Nd_0.208Ca_0.488)Ti_1-_x(Mg_1/3Ta_2/3)_xO₃(0.2≤x≤0.5, SNCTMTx) ceramics were prepared by solid sate reaction technique. Wherein, the relation between phase compositions, microstructures, sintering properties, and microwave dielectric properties of the SNCTMTx (0.2≤x≤0.5) ceramic systems were studied. The XRD results indicated that a single phase with orthorhombic perovskite-like structure was formed in the sample with x = 0.2, and a mixed phase system was formed in the samples with given compositional range x = 0.3 - 0.5 composed of orthorhombic perovskite phase, SrO phase and unknown second phase. Additionally, the ε_rfirst increased and then decreased, affected by the appearance and the content of the second phase. Meanwhile, the Q×f value showed down first and then up with the increase of (Mg_1/3Ta_2/3)⁴⁺ content because the increasing degree of 1:2 ordering could suppress the reduction in quality factor. Moreover, the τ_f gradually shifted to near-zero direction, which resulted from the variation of the oxygen octahedral distortion. The SNCTMTx (x=0.5) ceramic sintered at 1530℃ for 4 h showed better microwave dielectric properties with ε_r = 55.3, Q×f ≈ 7,400 GHz and τ_f ≈ 23.6×10^-6/℃.

Key words: perovskite, (Mg1/3Ta2/3)4+, microwave dielectric properties, (Sr0.2Nd0.208Ca0.488)TiO3

中图分类号:

TQ174

屈婧婧, 魏星, 宋小辉, 袁昌来, 刘飞. B位(Mg_1/3Ta_2/3)⁴⁺置换对新型Sr基(Sr, Nd, Ca)TiO₃微波陶瓷结构及介电性能的影响[J]. 无机材料学报, 2017, 32(3): 293-298.

QU Jing-Jing, WEI Xing, SONG Xiao-Hui, YUAN Chang-Lai, LIU Fei. B-site Substitution by (Mg_1/3Ta_2/3)⁴⁺ on Structures and Dielectric Properties of New Sr-based (Sr, Nd, Ca)TiO₃ Microwave Ceramics[J]. Journal of Inorganic Materials, 2017, 32(3): 293-298.

图/表 5

图1 SNCTMTx(0.2≤x≤0.5)陶瓷1500℃烧结4 h的XRD图谱

Fig. 1 XRD patterns of SNCTMTx (0.2≤x≤0.5) specimens sintered at 1500℃ for 4 h^Inset in (a) represents the enlarged figures of the superstructure reflections with B-site cation ordering. (b) The enlarged figure of (202) peak

图2 在1500℃烧结4 h的SNCTMTx(0.2≤x≤0.5)陶瓷背散射(BEIs)图片及其EDS图谱

Fig. 2 Back-scattered electron images (BEIs) and EDS pattern of SNCTMTx (0.2≤x≤0.5) specimens sintered at 1500℃ for 4 h

图3 SNCTMTx(0.2≤x≤0.5)陶瓷的体积密度随烧结温度变化的关系曲线

Fig. 3 Bulk density of SNCTMTx (0.2≤x≤0.5) ceramics as a function of sintering temperature

图4 SNCTMTx(0.2≤x≤0.5)陶瓷的εr随烧结温度变化的关系曲线

Fig. 4 εr of SNCTMTx (0.2≤x≤0.5) ceramics as a function of sintering temperature

图5 SNCTMTx(0≤x≤0.5)陶瓷Q×f和τf随x值的变化曲线

Fig. 5 Q×f and τf value of SNCTMTx (0≤x≤0.5) ceramics as a function of x

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B位(Mg_1/3Ta_2/3)⁴⁺置换对新型Sr基(Sr, Nd, Ca)TiO₃微波陶瓷结构及介电性能的影响

B-site Substitution by (Mg_1/3Ta_2/3)⁴⁺ on Structures and Dielectric Properties of New Sr-based (Sr, Nd, Ca)TiO₃ Microwave Ceramics

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