In the present study, Aurivillius-structured Ba2+ substituted CaBi2Nb2O9 (CBNO) ceramic powder was synthesized by co-precipitation method. The CBNO thick films were delineated by screen printing method on alumina substrates using co-precipitated ceramic powder. The overlay method was adopted to measure the microwave dielectric properties of prepared thick films. Single phase layered perovskite structure of the prepared thick films was confirmed by X-ray Diffraction. The effects of Ba2+ substitution on the surface morphology, bonding, and microwave dielectric properties of thick films were systematically presented. The maximum value of microwave dielectric constant for the CBNO thick films at 11.8 GHz is 15.6 for Ba2+=0.8 substitution. The shift in the stretching vibration modes of the Nb-O bond of NbO6 octahedron in the Raman spectra with a substitution of Ba2+ in CBNO was observed. The substitution of Ba2+ on A-site of CBNO improves the microwave dielectric properties of prepared thick films. This work may provide a new approach to enhance the microwave dielectric performance of Aurivillius-structured ceramic thick films.
Bibliographical noteFunding Information:
Authors are thankful to University Grants Commission DAE consortium, Indore, India for providing Raman measurement facilities. One of the authors Dr. Vijaya R. Puri gratefully acknowledges UGC New Delhi, India for the award of Research Scientist ‘C’. The author Gopal Kulkarni acknowledges DST-SERB for providing JRF under the project No. [SERB/F/2139/2016-17]. Authors VDP, GKK, and VRP are thankful to UGC-SAP, DST-FIST, and Physics Instrumentation Facility Centre, Department of Physics, Shivaji University, Kolhapur for their assistance. This work was supported by 'Korea-Africa Joint Research Programme' grant funded by the Korea government ( Ministry of Science, Technology & ICT ) in 2017K1A3A1A09085891 .
© 2018 Elsevier Ltd and Techna Group S.r.l.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Process Chemistry and Technology
- Surfaces, Coatings and Films
- Materials Chemistry