Effects of MgO, SrO and La2O3 Co-doping on Structure and Properties of (Zr0.8Sn0.2)TiO4 Ceramics

doi:10.15541/jim20150632

Abstract

Abstract:

(Zr_0.8Sn_0.2)TiO₄ (ZST) ceramics were fabricated via conventional solid-state reaction method which was promoted by liquid phase. The effects of MgO, SrO and La₂O₃ co-doping ZST ceramics on phase composition, microstructures, sintering behavior, and high frequency dielectric properties were investigated systematically. The results showed that the main crystalline phase of the ceramics was ZST. The appropriate amount of MgO, SrO and La₂O₃ additions effectively decreased the sintering temperature of ZST ceramics and improved the microwave dielectric properties. The increment of MgO addition influenced comprehensive properties of ZST ceramics slightly. The decrement in bulk densities, dielectric constants and Q×f values with excessive SrO addition was due to incomplete growth of grains, incompact structures and increasing porosities. Additionally, the additives did not affect obviously the temperature coefficient of resonant frequency (τ_f) of the ceramics. When added 0.2wt% MgO, 0.6wt% SrO and 1.0wt% La₂O₃ and sintered at 1300℃ for 5 h, ZST ceramics displayed the optimum comprehensive properties: ρ = 5.14 g/cm³, ε_r = 40.11, Q×f = 51000 GHz (f = 5.61 GHz), τ_f = -2.85×10^-6℃^-1.

Key words: (Zr0.8Sn0.2)TiO4, MgO, SrO co-doping, microstructures, sintering behavior, dielectric properties

CLC Number:

TB34

SUN Qing-Lei, ZHOU Hong-Qing, QIAN-Lei, WANG Ya-Zhou, ZHU Hai-Kui, YUE Zhen-Xing. Effects of MgO, SrO and La₂O₃ Co-doping on Structure and Properties of (Zr_0.8Sn_0.2)TiO₄ Ceramics[J]. Journal of Inorganic Materials, 2016, 31(8): 812-818.

Figures/Tables 8

Table 1 Samples with different mass fraction of MgO/SrO

Sample	MgO/wt%	SrO/wt%
A₁	0.2	0.2
A₂	0.2	0.4
A₃	0.2	0.6
A₄	0.2	0.8
A₅	0.2	1.0
B₁	0.4	0.2
B₂	0.4	0.4
B₃	0.4	0.6
B₄	0.4	0.8
B₅	0.4	1.0

Fig. 1 XRD patterns of ZST specimens

Table 2 Lattice parameters and unit cell volume of ZST specimens

Sample	Sintering temperature/℃	a/nm	b/nm	c/nm	Unit cell volume/nm³
A₁	1300	0.4471	0.5050	0.558	0.12599
A₃	1300	0.4473	0.5050	0.558	0.12604
A₅	1280	0.4806	0.5032	0.5447	0.13173

Fig. 2 Fracture surface SEM images of ZST specimens sintered at different temperatures(a) A1 sintered at 1280℃; (b) A3 sintered at 1300℃; (c) A3 sintered at 1340℃; (d) A5 sintered at 1280℃; (e) A5 sintered at 1340℃; (f) B5 sintered at 1340℃

Fig. 3 Bulk densities of ZST specimens as a function of sintering temperature

Fig. 4 Dielectric constants of the ZST specimens as a function of sintering temperature

Fig. 5 Q×f values of ZST specimens as a function of sintering temperature

Table 3 Frequency-temperature coefficient and flexure strength of ZST specimens

Sample	Sintering temperature/℃	τ_f/ (×10^-6, ℃^-1)	Flexure strength/MPa
A₁	1300	-5.14	147.04
A₃	1300	-2.85	143.61
A₅	1340	-6.14	131.34
B₁	1300	-4.46	137.03
B₃	1300	-4.26	135.56
B₅	1340	-8.53	125.45

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Effects of MgO, SrO and La₂O₃ Co-doping on Structure and Properties of (Zr_0.8Sn_0.2)TiO₄ Ceramics

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