Modifying the electrical properties of Ba<inf>0.85</inf>Ca<inf>0.15</inf>Zr<inf>0.1</inf>Ti<inf>0.9</inf>O<inf>3</inf> ceramics by the nanocrystals-induced method

• Main Authors: Parjansri P., Kamnoy M., Eitssayeam S., Intatha U.
• Format: Journal
• Published: 2017
• Online Access: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84994627557&origin=inward; http://cmuir.cmu.ac.th/jspui/handle/6653943832/41275
• Institution: Chiang Mai University

Copyright © 2016 American Scientific Publishers All rights reserved. This work investigated the phase formation and electrical properties of Ba 0.85 Ca 0.15 Zr 0.1 Ti 0.9 O 3 (BCZT) prepared by the nanocrystals-induced method. We prepared the nanocrystals or seeds by the molten salt method, using CaCO 3 and TiO 2 oxides as starting materials. The CaTiO 3 seeds showed a pure perovskite phase, and we obtained a particle size of ∼300 nm. After that, we mixed the CT seed with the starting powders of Ba 0.85 Ca 0.15 Zr 0.1 Ti 0.9 O 3 ceramic, prepared by the solid state reaction method. Results found that all ceramics showed a pure perovskite phase. The density values were in the range of 5.51 to 5.64 g/cm 3 , while relative density values were 96-99%. We measured the electrical properties (including dielectric, ferroelectric, and piezoelectric properties) as a function of CaTiO 3 seed content. We obtained the highest dielectric constant (ε r ∼ 4239) and lowest dielectric loss (tan δ ∼ 0.010) measured at room temperature from a sample with x = 0.08. Moreover, the BCZT doped with CaTiO 3 seed (x = 0.10) showed the highest values for the piezoelectric charge coefficient (d 33 ) ∼ 477 pC/N, piezoelectric voltage coefficient (g 33 ) ∼ 16 × 10 -3 Vm/N, and thickness mode electromechanical coupling (k t ) ∼ 51.18%. Results suggested that CaTiO 3 -seeds enhanced the electrical properties of the BCZT ceramic using low calcination temperatures and with less dwelling time.