(1- x)(Mg0.7Zn0.3)TiO3– xCa0.61La0.26TiO3系陶瓷的微波介电性能研究

doi:10.3724/SP.J.1077.2011.10387

无机材料学报 ›› 2011, Vol. 26 ›› Issue (2): 219-224.DOI: 10.3724/SP.J.1077.2011.10387 CSTR: 32189.14.SP.J.1077.2011.10387

• 研究快报 • 上一篇

(1- x)(Mg_0.7Zn_0.3)TiO₃– xCa_0.61La_0.26TiO₃系陶瓷的微波介电性能研究

赵莉 , 沈春英 , 丘泰

南京工业大学材料科学与工程学院,南京210009

收稿日期:2010-06-24 修回日期:2010-08-03 出版日期:2011-02-20 网络出版日期:2011-01-21
作者简介:ZHAOLi (1986-), female, candidate ofmaster. E-mail: zlgrace2009@163.com

Studieson the (1- x)Mg_0.7Zn_0.3TiO₃-xCa_0.61La_0.26TiO₃Microwave Dielectric Ceramics System

ZHAO Li, SHEN Chun-Ying, QIU Tai

College of Materials Scienceand Engineering, Nanjing University of Technology, Nanjing210009, China

Received:2010-06-24 Revised:2010-08-03 Published:2011-02-20 Online:2011-01-21

摘要/Abstract

摘要： 本实验研究了(1- x)(Mg_0.7Zn_0.3)TiO₃– x(Ca_0.61La _0.26)TiO₃(MZT-CLT)系陶瓷的微观结构和微波介电性能, 通过(Ca_0.61La _0.26)TiO₃来协调(Mg_0.7Zn_0.3)TiO₃陶瓷的谐振频率温度系数. MZT-CLT陶瓷的主晶相为(Mg_0.7Zn_0.3)TiO₃, 第二相为Ca_0.61La_0.26TiO₃和(Mg_0.7Zn_0.3)Ti₂O₅. 烧结温度和陶瓷组成对微波介电性能影响显著, 当烧结温度为 1275℃ 时, 可以获得良好的致密度, 当烧结温度超过 1300℃ 时, Zn的蒸发导致陶瓷致密度和介电性能下降. 随着(Ca_0.61La _0.26)TiO₃含量的增大, 材料的介电常数增大, 品质因数减小. 当 x =0.13, 烧结温度为 1275℃ 保温4h, (MZT-CLT)陶瓷具有优良微波介电性能,ε _r=26,Q·f =86000 GHz,τ _f= -6×10 ^-⁶/℃.

关键词: (1-x)(Mg_0.7Zn_0.3)TiO₃–x(Ca_0.61La_0.26)TiO₃陶瓷, 介电常数, 品质因数, 谐振频率温度系数

Abstract: The microstructures and the microwave dielectricproperties of the (1? x)(Mg_0.7Zn_0.3)TiO₃- xCa_0.61La_0.26TiO₃(MZT-CLT) ceramic system were investigated. The objective of the presentwork is to compensate for the negative temperature coefficient of resonantfrequency of (Mg_0.7Zn_0.3)TiO₃by the additionof (Ca_0.61La_0.26)TiO₃. MZT-CLTceramics exhibited mixed phases of (Mg_0.7Zn_0.3)TiO₃as the main phase associated with minor phases of Ca_0.61La_0.26TiO₃ and (Mg_0.7Zn_0.3)Ti₂O₅.The microwave dielectric properties are strongly correlated with the sinteringtemperature and the composition. Very dense MZT-CLT ceramics were synthesizedby sintering at1275 ℃. When the samples were sintered at temperaturesabove1300 ℃, the evaporation of Zn resulted the decrease indensity and degradation in dielectric properties. With the increasing of x, the relative dielectric constant ( ε_r) of the ceramicsincreases and the product of quality factor and resonant frequency ( Q · f) decreases. The ε_r, Q· fand temperature coefficient of resonant frequency ( τ_f) of 0.87(Mg_0.7Zn_0.3)TiO₃-0.13Ca_0.61La_0.26TiO₃ceramic sintered at1275℃ are 26, 86000 GHz and -6×10 ^-⁶/℃, respectively.

Key words: (1- x )(Mg_0.7Zn_0.3)TiO₃- x (Ca_0.61La_0.26)TiO₃ceramics, dielectric constant, quality factor, temperature stable resonant frequency

中图分类号:

TQ174

赵莉, 沈春英, 丘泰. (1- x)(Mg_0.7Zn_0.3)TiO₃– xCa_0.61La_0.26TiO₃系陶瓷的微波介电性能研究[J]. 无机材料学报, 2011, 26(2): 219-224.

ZHAO Li, SHEN Chun-Ying, QIU Tai. Studieson the (1- x)Mg_0.7Zn_0.3TiO₃-xCa_0.61La_0.26TiO₃Microwave Dielectric Ceramics System[J]. Journal of Inorganic Materials, 2011, 26(2): 219-224.

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(1- x)(Mg_0.7Zn_0.3)TiO₃– xCa_0.61La_0.26TiO₃系陶瓷的微波介电性能研究

Studieson the (1- x)Mg_0.7Zn_0.3TiO₃-xCa_0.61La_0.26TiO₃Microwave Dielectric Ceramics System

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