Effect of Al<inf>2</inf>O<inf>3</inf>nanoparticles on grain sizes and dielectric properties of BaFe<inf>1/2</inf>Nb<inf>1/2</inf>O<inf>3</inf>ceramics

• Main Authors: C. Warangkanagool, W. Chomchai, S. Eitssayeam
• Format: Journal
• Published: 2018
• Online Access: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84878708272&origin=inward; http://cmuir.cmu.ac.th/jspui/handle/6653943832/47867
• Institution: Chiang Mai University

In this research, the effect of Al 2 O 3 nanoparticles on grain size and dielectric properties of BaFe 1/2 Nb 1/2 O 3 (BFN) ceramics were investigated. The powder was prepared by the conventional mixed oxide method and calcined at 900-1200°C for 4h. The optimum temperature for calcinations the pure phase, was found to be about 1100°C. The calcined powders and Al 2 O 3 nanoparticles (0.5, 1 and 2 vol%) were ball milled with 1 wt% PVA in ethyl alcohol for 12 h using the same method as mentioned earlier. The slurry was dried, sieved and pressed into a disc shape and sintered at 1350°C for 4h with heating rate of 5°C/min. The microstructure was examined by scanning electron microscope (SEM). The dielectric constant and dielectric loss of BFN ceramics with 0, 0.5, 1 and 2 vol% Al 2 O 3 nanoparticles were measured at 1 kHz frequency at room temperature using LCR meter. The results show that, the average grain sizes of BFN ceramics were found to decrease with the addition of the Al 2 O 3 nanoparticles. The dielectric loss of BFN ceramics with Al 2 O 3 nanoparticles was decreased about 40-50% of pure BFN ceramics. Copyright © Taylor & Francis Group, LLC.