Radiofrequency and microwave properties study of the electroceramic BaBi4Ti4O15

• Published in: Materials science & engineering. B, Solid-state materials for advanced technology Vol. 182; pp. 37 - 44
• Main Authors: Silva, P.M.O., Fernandes, T.S.M., Oliveira, R.M.G., Silva, M.A.S., Sombra, A.S.B.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.03.2014
• Subjects: Antenna; Aurivillius; Ceramics; Dielectric properties; TCC; Temperature coefficient of resonant frequency; Ceramics; TCC; Dielectric properties; Temperature coefficient of resonant frequency; Aurivillius; Antenna
• ISSN: 0921-5107; 1873-4944
• DOI: 10.1016/j.mseb.2013.11.017

•We used lower calcination temperature for synthesis of BaBi4Ti4O15 by milling of precursor oxides.•Structural and dielectric study of BaBi4Ti4O15 was performed in the radiofrequency and microwave range.•We used lower sinterization temperature for fabrication ceramic BaBi4Ti4O15-based.•We study BBT as dielectric resonator antenna. In this work, BBT has been synthesized by solid-state reaction. X-ray diffraction and Raman spectroscopy were used to structurally characterize the samples. The dielectric properties were analyzed by impedance spectroscopy for radiofrequency range. For microwave range, the dielectric properties were analyzed by the Hakki–Coleman method. The properties of a DRA made from BBT were obtained by numerical simulations and compared with experimental results. The results show that the synthesis of BBT was effective from 800°C, showing nanosize particles (35–45nm) with tetragonal symmetry. Raman spectra exhibited all active modes characteristic of BBT. The dielectric properties of BBT presented high values of dielectric permittivity (ɛ′=52.40 for microwave range and ɛ′>100 for radiofrequency range). BBT ceramic based showed negative values of (−422.11ppm°C−1) temperature coefficient of resonant frequency. The DRA BBT-based demonstrated the use as an antenna, exhibiting small gain of 1.1dBi and efficiency of 32.5%.