Studieson the (1- x)Mg0.7Zn0.3TiO3-xCa0.61La0.26TiO3Microwave Dielectric Ceramics System

doi:10.3724/SP.J.1077.2011.10387

Abstract

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

CLC Number:

TQ174

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

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