About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
|
Advances in Dielectric Materials and Electronic Devices
|
Presentation Title |
D-6: Synthesis of BT-BNT and BT-BNTN Relaxors by 2D Nanosheets Wrapping Methods |
Author(s) |
Taeyeong Song, Hanwool Kim, Do-Kyun Kwon |
On-Site Speaker (Planned) |
Taeyeong Song |
Abstract Scope |
One effective way for the BaTiO3 ferroelectric ceramics to exhibit stable dielectric polarizations persisting over a wide temperature range can be found in forming complex perovskite compounds by heterovalent cation substitutions. (1-x)BaTiO3-x(Bi,Na)TiO3 and (1-x)BaTiO3-x(Bi,Na)(Ti1-yNby)O3 solid solutions were synthesized using a newly developed "wrapping process", which is a 2-D nanosheet-based process for preparing core-shell type assembly of BT nanoparticles and BNT/BNTN nanosheets mixtures. Since the solid solution formations from the mixtures can be described as a diffusion-controlled process, it could provide a plausible circumstance to maximize the contact area to secure high level reactivity within the heterogeneous substances. The core-shell type configurations were responsible for the accelerated sintering behaviors without excessive grain growth. The sintered samples showed relaxor characteristics with high dielectric permittivity and energy density. Further improvements in temperature stability of dielectric properties to satisfy the X8R and X9R specifications were achieved by Nb doped BNT (BNTN) nanosheets wrapping. |