• Journal of the Korean Ceramic Society
• /
• v.24 no.6
• /
• pp.537-542
• /
• 1987

The microstructure and electrical properties of Pb[(Sb1/2 Nb1/2)0.08 Zr0.49 Ti0.48]O3 with MnO2 addition have been investigated in this work. The amount of MnO2 addition was 0, 0.4, 0.8, 1.2, 2.0 wt%, respectively. The soild solution range of MnO2 that assumed in this composition according to thevariations of micro-structure and electrical properties was 0.4-0.8 wt%.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2008.06a
• /
• pp.330-330
• /
• 2008

$Fe_2O_3$ added Pb$(Ni_{1/3}Nb_{2/3})O_3-PbTiO_3-PbZrO_3 $ (PNN-PT-PZ) ceramics were produced in order to use them as a bimoph acturator for energy harvesting. Especially, the 0.25 wt% $Fe_2O_3$ added 0.4PNN-0.357PT-0.243PZ, having the composition of morphotropic phase boundary, showed good piezoelectric properties of $d_{33}$ of 810 pC/N, $k_p$ of 77% and $Q_m$ of 55 along with a high Curie temperature of $210^{\circ}C$. A bimorph actuator, composed of the two piezoelectric layers bonded together with a phosphorous bronze layer as a central metallic electrode, was successfully fabricated. The bimorph actuator, vibrated with a 1.3 mm amplitude at 68 Hz, produced high electric power of approximately 60 mW.

• Journal of the Korean Ceramic Society
• /
• v.39 no.8
• /
• pp.742-749
• /
• 2002

The PZT thin films werre deposited on Pt/Ti/$SiO_2$/Si substrate by R. F. magnetron sputtering with $Pb_{1.1}Zr_{0.53}Ti_{0.47}O_3$ target. When interlayers(PbO, $TiO_2$, PbO/$TiO_2$) were inserted between PZT and Pt, the crystallization of the PZT thin films was considerably improved and the processing temperature was lowered. Compared to the pure PZT thin films, dielectric constant, dielectric loss and polarization properties of PZT thin films with interlayers were considerably improved. From XPS depth profile analysis, it was confirmed that PZT thin films and interlayers existed independently. In particular, PZT thin films deposited on interlayer(PbO/$TiO_2$) showed the best dielectric property (${\varepsilon}_r$=414.94, tan${\delta}$=0.0241, Pr=22${\mu}C/cm^2$).

• Korean Journal of Materials Research
• /
• v.7 no.12
• /
• pp.1058-1062
• /
• 1997

강유전체 전계효과를 관찰하기 위해 LaCoO$_{3}$/Pb(Zr, Ti)O$_{3}$(La, Sr)CoO$_{3}$ 다층구조를 LcOo$_{3}$가 기판 위에 pulsed laser deposition(PLD)법으로 에피택셜하게 성장시켰다. 이러한 다층구조에서는 전도성 채널층으로 Si대신 반도성 LaCoO$_{3}$가 사용 되었다. LaCoO$_{3}$(LCO)의 비저항은 산소 분위기에 의하여 변화되었는데 특히 증착시 산소 분위기에 의존함을 보였다. LCO의 비저항은 0.1-100Ωcm범위에서 변화되었다. LCO층에 유도되는 강유전체 전계효과는 Pb(Zr, Ti)O$_{3}$(PZT)의 분극 상태에 따른 LCO의 저항 변화를 측정함으로써 관찰되었는데 1020$\AA$ 두께를 가진 LCO층에서는 4%의 저항 변화를 얻었으며 680$\AA$의 LCO에서는 9%의 증가된 저항 변화를 얻었다. DC 바이어스(-5V)를 가한 후에는 저항 변화가 45%까지 증가하였다. 이러한 결과는 적당한 비저항을 갖는 LCO를 사용한 LCO/PZT/LSCO다층구조가 강유전체 전계효과 트랜지스터로 사용될 수 있다는 가능성을 제시하고 있다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2008.06a
• /
• pp.310-310
• /
• 2008

본 연구에서는 (1-x) Pb(Zr0.515Ti0.485)$O_3$ - x Pb$(Sb_{1/2}Nb_{1/2})O_3$ + 0.5wt% $MnO_2$ 조성에 Pb$(Sb_{1/2}Nb_{1/2})O_3$ (PSN) (x=0.02, 0.04, 0.06, 0.08) 변화에 따른 미세구조 및 압전, 유전특성에 관해 고찰하였다. PSN 치환량이 증가함에 따라 정방정 (tetragonal)구조에서 삼방정(rhombohedral)구조로 상전이가 일어났으며, 결정립의 크기가 작아지는 것을 확인하였다. 전기기계결합계수 (kp) 는 PSN이 4 mol % 치환됨에 따라 증가하였으며, 더 이상 치환 시 감소하였다. PSN 치환에 따른 전기적 특성은, 결정구조, 결정립의 크기 및 2 차상 등의 미세구조와 긴밀한 관계가 있는 것으로 보여진다. 상경계(Morphotropic Phase Boundary) 영역인 0.96 Pb(Zr0.515Ti0.485)$O_3$ - 0.04 Pb$(Sb_{1/2}Nb_{1/2})O_3$ + 0.5wt% $MnO_2$ 조성에서 $\varepsilon{^T}_{33}/\varepsilon_o$ = 1109, $k_p$= 70.8 (%), $d_{33}$= 325 (pC/N)의 우수한 특성을 나타내었다.

• Proceedings of the Korean Ceranic Society Conference
• /
• 2000.04a
• /
• pp.32.2-32.2
• /
• 2000

• Journal of the Korean Crystal Growth and Crystal Technology
• /
• v.2 no.2
• /
• pp.71-76
• /
• 1992

Piezoceramic filters were fabricated by adding $MnO_2 and FeZ0_3$ to the $0.05Pb(Al_{2/3}W_{1/3})O_3-0.95Pb(Zr_{0.52}Ti0.48)O_3$ system using photolithography method. As the amounts of $MnO_2$ increased, the electro-mechanical coupling factor(Kp) decresed. On the other hand, for $Fe_2O_3$ added samples, Kp was 57%, but mechanical quality factor(Qm) showed relatively low value. The passband widths were 155kHz for 0.3wt % $MnO_2$ addition and 260kHz for 0.1 wt % $Fe_2O_3$ addition, and were inversely propotional to Qm values. Group delay time characteristics showed Gausian for $MnO_2$ additions and Butterworth for$Fe_2O_3$ additions.

• Proceedings of the Materials Research Society of Korea Conference
• /
• 2002.05a
• /
• pp.158-158
• /
• 2002

• Proceedings of the Materials Research Society of Korea Conference
• /
• 1992.05a
• /
• pp.102-103
• /
• 1992

• Proceedings of the Korean Ceranic Society Conference
• /
• 2004.04b
• /
• pp.51.1-51.1
• /
• 2004