中文摘要：

用固相反应法合成得到了一种钙钛矿结构的无铅新陶瓷材料（Na1／4Bi3／4）（Mg1／4Ti3／4）O3（NBMT）。NBMT为低温烧结陶瓷，成瓷温度在1050℃左右，室温下具有六方结构，点阵常数a=4．92nm，c=5．19nm。NBMT陶瓷室温下的介电常数为720，在320℃附近达最大值1900；其陶瓷呈现弛豫型铁电体的特征，△Tm高达107℃，不同于一般弛豫铁电体，矫顽场强高于40kV／cm。NBMT的压电常数d33为7pC／N。

英文摘要：

A new-style of lead-free perovskite ceramic, sodium-bismuth magnesium-titanate （Na1/4Bi3/4）（Mg1/4Ti3/4）O3 （NBMT） was fabricated by conventional ceramic sintering technique. The ceramics shows hexagonal structure at room temperature. The lattice parameters a = 4.92 nm, c = 5. 19 nm. NBMT ceramic has low sintering temperature, its sintering temperature was around 1 050 ℃. Its room dielectric constant was 720 and the maximum valur reached 1 900 at 320 ℃. The dielectric, ferroelectric and piezoelectric properties were investigated. NBMT ceramic presents relaxor ferroelectric property, but its coercive field would be over 40 kV/cm. While its d33 was 7 pC/N.