| A-site Vacancy가 0.97Bi0.5+x(Na0.78K0.22)0.5-3xTiO3-0.03LaFeO3 무연압전 세라믹스의 압전특성에 미치는 영향 |
| 박정수, 이규탁, 조정호, 정영훈, 백종후, 윤지선 |
| 한국세라믹기술원 전자소재융합본부 |
| Effects of A-site Vacancies on the Piezoelectric Properties of 0.97Bi0.5+x(Na0.78K0.22)0.5-3xTiO3-0.03LaFeO3 Lead-free Piezoelectric Ceramics |
| Jung Soo Park, Ku Tak Lee, Jeong Ho Cho, Young Hun Jeong, Jong Hoo Paik, Ji Sun Yun |
| Electronic Materials Convergence Division, Korea Institute of Ceramic Engineering and Technology |
|
|
|
|
|
| ABSTRACT |
|
$0.97Bi_{0.5+x}(Na_{0.78}K_{0.22})_{0.5-3x}TiO_3-0.03LaFeO_3$ lead-free piezoelectric ceramics were fabricated by a solid state reaction method. $LaFeO_3$ additives were added to $Bi_{0.5}(Na_{0.78}K_{0.22})_{0.5}TiO_3$ for volatile compensation of bismuth and sodium ions in the sintering process. To create A-site vacancies, the mole ratio and charge valence of A-site ions ($Bi^{3+}$, $Na^+$ and $K^+$) were controlled. The improved piezoelectric properties were observed by addition of $LaFeO_3$ and control of A-site vacancies. In particular, a $d_{33}^*(S_{max}/E_{max})$ value of 614pm/V and an electric field induced strain of 0.33% was observed in $0.97Bi_{0.505}(Na_{0.78}K_{0.22})_{0.485}TiO_3-0.03LaFeO_3$ ceramic. |
| Key words:
BNKT, A-site vacancy, $LaFeO_3$, Dielectric function, Piezoelectric properties |
|
PDF Links
Full text via DOI
Download Citation 
