Abstract
The effects of secondary phases on microwave dielectric properties were investigated for CaSmAlO4‐based ceramics with bulk compositions of (2+2x)CaO·(1−x)Sm2O3·Al2O3 (x=−0.10, −0.05, 0, 0.05, 0.10) and (2+2x)CaO·Sm2O3·Al2O3 (x=0.02, 0.04). In dense ceramics with bulk compositions of (2+2x)CaO·(1−x)Sm2O3·Al2O3, Ca3Al2O6 (x>0) and SmAlO3 (x≤0) secondary phases were observed. Moreover, Sm2O3 was detected for x<0, while CaO was only detected at x=0.2. The secondary phases of Ca3Al2O6 and SmAlO3 increased the dielectric loss (tan δ) and the temperature coefficient of the resonant frequency (τf). In dense ceramics with bulk compositions of (2+2x)CaO·Sm2O3·Al2O3 (x=0.02, 0.04), the additional CaO eliminated the SmAlO3 secondary phase and led to the formation of a CaSmAl3O7 secondary phase. Microwave dielectric properties were greatly improved for ceramics with bulk compositions of (2+2x)CaO·Sm2O3·Al2O3 (x=0.02, 0.04): ɛr=19.2; Q×f=120 000–120 400 GHz; τf=−10 to −9 ppm/°C.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
