本实验研究了(1-x)(Mg_(0.7)Zn_(0.3))TiO_3-x(Ca_(0.61)Nd_(0.26))TiO_3体系陶瓷(MZCNT)的微波介电性能,通过(Ca_(0.61)Nd_(0.26))Ti_3协调(Mg_(0.7)Zn_(0.3))TiO_3陶瓷的谐振频率温度系数.实验发现,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1250℃时,可以获得良好的致密度,当烧结温度超过1300℃时,(Ca_(0.61)Nd_(0.26)拍)Ti0_3的分解和zn的蒸发导致陶瓷致密度和介电性能下降.此外,随着(Ca_(0.61)Nd_(0.26))TiO_3含量的增大,材料的介电常数增大,品质因数减小.当(Ca_(0.61)Nd_(0.26))TiO_3含量为13%,烧结温度为1250℃,保温4h,(MZCNT)陶瓷具有优良微波介电性能,ε_r=24.3,Q·f=34000GHz,τ_f～-9×10~(-6)/℃,从而达到实用要求.
The microwave dielectric properties of the (1-x)(Mg_(0.7)Zn_(0.3)) TiO_3-x(Ca_(0.61)Nd_(0.26)) TiO_3 (MZCNT) system were investigated. The system was prepared using a conventional solid-state ceramie rute. The objective of the present work is to compensate for the negative temperature coefficient of resonant frequency (τ_f) of (Mg_(0.7)Zn_(0.3)) TiO_3 by the addition of (Ca_(0.61)Nd_(0.26)) TiO_3. The microwave dielectric properties are strongly correlated with the sintering temperature and the composi-tion. Very dense MZCNT ceramics were synthesized by sintering at 1250℃, when sintered at temperatures above 1300℃, the decomposition of (Ca_(0.61)Nd_(0.26)) TiO_3 and evaporation of Zn resulted the decrease in density and degradation in dielectric proper-ties. With increasing (Ca_(0.61)Nd_(0.26)) TiO_3, the dielectric constant (ε_r) increased and the quality factor Q×f decreased. For practical application, 0.87 (Mg_(0.7)Zn_(0.3)) TiO_3 - 0.13 (Ca_(0.61)Nd_(0.26)) TiO_3 ceramics sintered at 1250℃ with a dielectric constant ε_r-24.3, a Q×f value of 34000GHz and a temperature coefficient of resonance frequency (τ_f) of -9×10~(-6)/℃ is proposed in this paper.
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