(1-x)(Mg_(0.9)Zn_(0.1))TiO_3-x(Ca_(0.61)La_(0.26))TiO_3系微波介质陶瓷的改性研究

Microwave dielectric properties of ceramics based on (1-x)(Mg_(0.9)Zn_(0.1))TiO_3-x(Ca_(0.61)La_(0.26))TiO_3 system

实验研究了(1-x)(Mg0.9Zn0.1)TiO3-x(Ca0.61La0.26)TiO3(MZCLT)系陶瓷的微观结构和微波介电性能。目的是通过(Ca0.61La0.26)TiO3协调(Mg0.9Zn0.1)TiO3陶瓷的谐振频率温度系数。MZ-CLT陶瓷的主晶相为(Mg0.9Zn0.1)TiO3和Ca0.61La0.26TiO3,还有微量的(Mg0.9Zn0.1)Ti2O5。随着(Ca0.61La0.26)TiO3含量的增大,材料的介电常数增大,品质因数减小。当x=0.15,烧结温度为1325℃时,MZ-CLT陶瓷具有优良微波介电性能:rε=25.59,Q.f=96000(8GHz),fτ=+1×10-6/℃。

The microstructures and the microwave dielectric properties of the （1-x）（Mg0.9Zn0.1）TiO3-x（Ca0.61La0.26）TiO3 （MZCLT hereafter） ceramic system were investigated. The objective of the present work is to compensate for the negative temperature coefficient of resonant frequency of （Mg0.9Zn0.1）TiO3 by the addition of （Ca0.61La0.26）TiO3. MZCLT ceramics exhibited mixed phases of （Mg0.9Zn0.1）Ti2O5 and （Ca0.61La0.26）TiO3 as the main phases associated with minor phase of （Mg0.9Zn0.1）Ti2O5. With increasinr .x, the dielectric constant increased and the quality factor Q · f decreased. For x=0.15. the MZCI.T exhabites excellent microwave dielec- tric properties： ε=25.59,Q·f=96000（8GHz）and f=＋1×10^-6/℃.