| 학회 |
한국재료학회 |
| 학술대회 |
2015년 봄 (05/14 ~ 05/15, 구미코) |
| 권호 |
21권 1호 |
| 발표분야 |
G. 나노/박막 재료 |
| 제목 |
Synthesis and Characterization of Ultrafine BaTiO3 Nanoparticles Prepared by Hydrothermal Reaction |
| 초록 |
BaTiO3 has been widely used as a primary material in various electronic devices including thermistors, electro-optical devices, and multilayer ceramic capacitors (MLCCs) due to its prominent dielectric properties. The advances in portable devices necessitate the fabrication of miniaturized MLCCs maintaining high capacity. In this regard the size of BaTiO3 powders is essential to be reduced down to below 100nm for the 1μm-thickness dielectric layer. However, the dielectric property of BaTiO3 nanoparticles are drastically decreased when the particle size decreases below a certain critical size around 50 nm due to the presence of interal defects and cubic layers formed by the surface relaxation. Here, we carry out various analyses to confirm the influences of those additives to the size and tetragonality of BaTiO3 nanopowders. The crystallinity and morphology of resulting BaTiO3 nanoparticles have been characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM) and Raman spectroscopy. The phase transition related with the presence of intragranular pores in the as-synthesized BaTiO3 particles is discussed based on the Rietveld refinement results. |
| 저자 |
Changyeon Baek, San Moon, Do Kyung Kim
|
| 소속 |
KAIST |
| 키워드 |
BaTiO<SUB>3</SUB>; Hydrothermal; Internal defect; Size effect; Phase transition
|
| E-Mail |
|
