Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7898425 | Journal of the European Ceramic Society | 2018 | 17 Pages |
Abstract
The 0.8Bi3.15Nd0.85Ti3O12 (BNdT)-0.2CoFe2O4 (CFO) composite multiferroic ceramics have been fabricated by spark plasma sintering (SPS) at 850â¯Â°C. The relative density of as-sintered SPS ceramic reaches 97.4 (±0.3)%. The composites are composed of pure BNdT and CFO phases without any preferred c-orientation. The a-orientation preference is more obvious perpendicular to the pressure direction. The average grain-sizes of BNdT and CFO are 163 and 146â¯nm, respectively. The BNdT phase has more grains below 100â¯nm (â¼20%). The super energy-dispersive X-ray analyses suggest no serious reaction between BNdT and CFO. The Raman spectrum verifies the nano-structure of the SPS ceramic via the broadening bands and peak shifts. The Curie temperature of the SPS ceramic declines to 560â¯Â°C with stabilized dielectric loss. The grain boundary resistance plays a dominant role on impedance above 700â¯Â°C. The remanent polarization approaches to 15.2â¯Î¼C/cm2 (300â¯kV/cm) with lower coercive fields (â89/+95â¯kV/cm).
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Hongjun Zhang, Hua Ke, Huijiadai Luo, Pengkang Guo, Bin Yang, Dechang Jia, Yu Zhou,