Journal of Inorganic Materials ›› 2017, Vol. 32 ›› Issue (3): 293-298.doi: 10.15541/jim20160317

• Orginal Article • Previous Articles     Next Articles

B-site Substitution by (Mg1/3Ta2/3)4+ on Structures and Dielectric Properties of New Sr-based (Sr, Nd, Ca)TiO3 Microwave Ceramics

Jing-Jing QU1(), Xing WEI1, Xiao-Hui SONG1, Chang-Lai YUAN2, Fei LIU3()   

  1. 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 Online:2017-03-20 Published: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)

Abstract:

(Sr0.2Nd0.208Ca0.488)Ti1-x(Mg1/3Ta2/3)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 εr first 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 (Mg1/3Ta2/3)4+ content because the increasing degree of 1:2 ordering could suppress the reduction in quality factor. Moreover, the τf 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 εr = 55.3, Q×f ≈ 7,400 GHz and τf ≈ 23.6×10-6/℃.

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

CLC Number: 

  • TQ174