MgO/SrO/La2O3多元添加对(Zr0.8Sn0.2)TiO4微波陶瓷结构性能影响

doi:10.15541/jim20150632

摘要/Abstract

摘要：

基于液相促进固相反应烧结机制, 设计MgO/SrO/La₂O₃多元复合添加(Zr_0.8Sn_0.2)TiO₄(ZST)体系, 探究复合添加剂对ZST陶瓷的物相组成、微观结构、烧结特性以及高频介电性能等参数的影响。实验结果表明: 陶瓷的主晶相均为ZST相; 适量添加MgO/SrO/La₂O₃可以有效地降低ZST陶瓷的烧结温度, 获得较优的微波介电性能; 但MgO添加量的增多对材料的综合性能有小幅度的影响; SrO的添加量过大会造成晶粒的不完全生长、瓷体不致密和气孔的增多, 从而导致材料的密度、介电常数和Q×f值的下降; 此外, 添加剂对陶瓷的频率温度系数(τ_f)影响不大。在复合添加0.2wt%MgO、0.6wt%SrO、1.0wt%La₂O₃时, 1300℃保温5 h的ZST陶瓷综合性能优异: ρ=5.14 g/cm³, ε_r=40.11, Q×f=51000 GHz (f=5.61 GHz), τ_f=-2.85×10^-6℃^-1。

关键词: (Zr0.8Sn0.2)TiO4, MgO/SrO多元添加, 微观结构, 烧结特性, 介电性能

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

中图分类号:

TB34

孙庆磊, 周洪庆, 钱磊, 王亚洲, 朱海奎, 岳振星. MgO/SrO/La₂O₃多元添加对(Zr_0.8Sn_0.2)TiO₄微波陶瓷结构性能影响[J]. 无机材料学报, 2016, 31(8): 812-818.

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.

图/表 8

表1 不同MgO/SrO添加量试样及其编号

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

图1 ZST试样的XRD图谱

Fig. 1 XRD patterns of ZST specimens

表2 ZST试样的晶格常数和晶胞体积

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

图2 不同温度烧结ZST试样的断面SEM照片

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℃

图3 ZST试样密度随烧结温度的变化

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

图4 ZST试样介电常数随烧结温度的变化

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

图5 ZST试样Q×f值随烧结温度的变化

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

表3 ZST试样的频率温度系数和抗弯强度

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

参考文献 20

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MgO/SrO/La₂O₃多元添加对(Zr_0.8Sn_0.2)TiO₄微波陶瓷结构性能影响

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

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