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

doi:10.15541/jim20160317

Abstract

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

CLC Number:

TQ174

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.

Figures/Tables 5

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

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

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

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

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

References 20

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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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