HU Dongli¹ , ZENG Lingke¹ , LIU Pingan¹ , SHUI Anzhe¹ , WANG Hui¹ , LIU Yanchun¹ , LI Qian²

(1.Material Ins titute,South China Univers ity of Technology ,Guangzhou 510640)

(2.Henan Univers ity of Science and Technology,Luoyang 471003)

Abstract: In this article,Pr₂O₃ was used to subs titute Sm₂O₃to improve the dielectric properties of CaO- Li₂O- Sm₂O₃- TiO₂ (CLST) .The ceramics was obtained by solid phase method .It was found that the CLPST- x ceramics exis ted a s ingle perovskite phase . It was showed that the ceramics of CLPST- x have well dielectric properties of higher dielectric cons tant ( εr=101);a lower dielectric los s ( tanδ=0.00923) and low temperature coefficient of the resonant frequency (τf=- 85ppm/℃) when CaO : Li₂O :Sm₂O₃:Pr₂O₃:TiO₂ =16:9:8:4:63 and the s intering temperature is 1300℃. Further more，the crys tal grain is fine in s zeand the grain boundary is clear in the SEM picture.

Keywords: microwave dielectric ceramics ，dielectric properties，CLST，subs titution