Abstract
AbstractHigh dielectric constant Ba4(Pr0.4Sm0.6)28/3Ti18−yGa4y/3O54 (BPSTG) (0 ≤ y ≤ 1) microwave ceramics with enhanced dielectric properties were synthesized via the traditional solid‐state processing for the first time. The crystal structure, microstructure, and microwave dielectric characteristics were investigated in details. X‐ray diffraction results showed that all well‐sintered samples belonged to a single tungsten bronze type phase. Results showed that partial substitution of Ga3+ for Ti4+ is an effective way in adjusting the temperature coefficient of resonant frequency (TCF) value of the Ba4(Pr0.4Sm0.6)28/3Ti18O54 ceramics and increased the quality factor (Qf) values. The variation tendency of dielectric constant was in accordance with the ionic polarizability. The Qf values highly depend on the grain size from the scanning electron microscopy results. A near zero TCF value can be obtained by carefully adjusting the substitution of Ga3+ content. Infrared reflectivity (FIR) spectra were employed to reveal the relationship between the phonons and microwave dielectric properties. At last, excellent combinations dielectric properties of εr = 78.5, Qf = 12,400 GHz, TCF = +2.1 ppm/°C were achieved in BPSTG ceramics when y = 0.75.
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.
