| Bi(NiaX1-a)O3-PbTiO3 계 압전 신조성(X-Ti,Nb)의 내전압 특성 향상 |
| 최순목, 서원선 |
| 요업기술원 시험인증본부 |
| Improvement of the Resistivity in High Field for the New Piezoelectric Compositions in the Bi(NiaX1-a)O3-PbTiO3(X=Ti,Nb) System |
| Soon-Mok Choi, Won-Seon Seo |
| Testing and Certification Division, Korea Institute of Ceramic Engineering & Technology |
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| ABSTRACT |
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Lead-free ferroelectric ceramics are widely researched today for industrial applications as sensors, actuators and transducers. Since $Pb(Zr_aTi_{1-a})O_3$-(PZT) has high Curie temperature($T_C$), high piezoelectric properties near its morphotropic phase boundary(MPB) composition and small temperature dependence electrical behavior, it has been used to commercial materials for wide temperature range and different application fields. According to the tolerance factor concept, since the $Bi^{3+}$ cation with 12-fold coordinate has a smaller ionic radius than 12-fold coordinate $Pb^{2+}$, most bismuth based perovskites possess a smaller tolerance factor. Therefore, MPBs with a higher $T_C$ may be expected in $Bi(Me^{3+})O_3PbTiO_3$ solid solutions. As in lead based perovskite systems, it is clear that we need to explore more materials in simple or complex bismuth based MPB systems. The objective of this study is to investigate the $Bi(Ni_{1_a}X_a)O_3-PbTiO_3(X=Ti^{4+},;Nb^{5+})$ perovskite solid-solution. For improving the electronic conduction problem, the magnesium and manganese modified system was also studied. |
| Key words:
Piezoelectric$Bi_2O_3$, Resistivity, Acceptor |
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