• Title/Summary/Keyword: Piezoelectric$Bi_2O_3$

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Piezoelectric and Dielectric Properties of Low Temperature Sintering (Na,K,Li)(Nb,Sb,Ta)O3 Ceramics Doped with CuO (CuO 첨가된 저온소결 (Na,K,Li)(Nb,Sb,Ta)O3계 세라믹스의 압전 및 유전 특성)

  • Lee, Gwang-Min;Yoo, Ju-Hyun;Lee, Jie-Young
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.28 no.4
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    • pp.229-233
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    • 2015
  • In this paper, in order to develop outstanding Pb-free piezoelectric composition ceramics, the $(Na_{0.525}K_{0.443}Li_{0.037})(Nb_{0.883}Sb_{0.08}Ta_{0.037})O_3+0.3wt%Bi_2O_3+0.4wt%Fe_2O_3+xwt%CuO$ (x= 0~0.8 wt%)(abbreviated as NKL-NST) lead-free piezoelectric ceramics have been synthesized using the ordinary solid state reaction method. The effects of CuO-doping on the structure and electrical properties of the NKL-NST ceramics were systematically studied. The results show that the ceramics exhibit a pure perovskite structure with orthorhombic phase at room temperature, and secondary phase was found in the ceramics. The 0.4 wt%CuO added ceramics sintered at $950^{\circ}C$ showed the optimum properties of piezoelectric constant($d_{33}$), planar piezoelectric coupling coefficient(kp) and mechanical quality factor(Qm) : $d_{33}=213$[pC/N], kp= 0.43, Qm= 423,respectively.

Synthesis of High-Aspect-Ratio BaTiO3 Platelets by Topochemical Conversion and Fabrication of Textured Pb(Mg1/3Nb2/3)O3-32.5PbTiO3 Ceramics

  • Zhao, Wei;E, Lei;Ya, Jing;Liu, Zhifeng;Zhou, Heping
    • Bulletin of the Korean Chemical Society
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    • v.33 no.7
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    • pp.2305-2308
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    • 2012
  • Perovskite structured barium titanate particles ($BaTiO_3$) platelets were synthesized by molten salt synthesis and topochemical microcrystal conversion. As the precursors of $BaTiO_3$, plate-like $BaBi_4Ti_4O_{15}$ particles were first synthesized by the reaction of $Bi_4Ti_3O_{12}$, $BaCO_3$, and $TiO_2$ at $1080^{\circ}C$ for 3 h in $BaCl_2$-KCl molten salt. After the topochemical reactions, layer-structured $BaBi_4Ti_4O_{15}$ particles transformed to the perovskite $BaTiO_3$ platelets. $BaTiO_3$ particles with thickness of approximately $0.5{\mu}m$ and a length of $10-15{\mu}m$ retained the morphology feature of the $BaBi_4Ti_4O_{15}$ precursor. For <001> $Pb(Mg_{1/3}Nb_{2/3})O_3-32.5PbTiO_3$ (PMNT)-5 wt % PbO piezoelectric ceramics textured with 5 vol % of $BaTiO_3$ templates, the Lotgering factor reached 0.82, and $d_{33}$ was 870 pC/N.

Electrical Properties of $Bi_4Ti_3O_{12}$ Thin Films dependant on Oxygen Partial Pressure during Annealing (열처리 산소 분압에 따른 $Bi_4Ti_3O_{12}$ 박막의 전기적 특성 변화)

  • Cha, Yu-Jeong;Nahm, Sahn;Jeong, Young-Hun;Lee, Young-Jin;Paik, Jong-Hoo
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2009.06a
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    • pp.191-191
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    • 2009
  • $Bi_4Ti_3O_{12}$ (BiT) thin films were well developed on the Pt/Ti/$SiO_2/Si$ substrate by a metal organic decomposition (MOD) method. Oxygen was effective on the crystallization of the BiT thin films during a rapid thermal annealing process. The electrical properties of the BiT films dependant on the oxygen partial pressure were investigated. No crystalline phase was observed for the BiT film annealed at $700^{\circ}C$ under oxygen free atmosphere. However, its crystallinity was significantly evolutionned with increasing oxygen partial pressure. In addition, its dielectric and piezoelectric properties were enhanced with increasing oxygen partial pressure to 10 torr. Especially, the BiT film, annealed at $700^{\circ}C$ and 10 torr oxygen pressure, showed good dielectric properties: dielectric constant of 51 and dielectric loss of 0.2 % at 100 kHz. Its leakage current and piezoelectric constant ($d_{33}$) was also considerably improved, being as 0.62 nA/$cm^2$ at 1 V and approximately 51 pm/V, respectively.

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Enhanced Piezoelectric Properties of (1-x)[0.675BiFeO3-0.325BaTiO3]-xLiTaO3 Ternary System by Air-Quenching

  • Akram, Fazli;Malik, Rizwan Ahmed;Lee, Soonil;Pasha, Riffat Asim;Kim, Myong Ho
    • Korean Journal of Materials Research
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    • v.28 no.9
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    • pp.489-494
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    • 2018
  • Lead free $(1-x)(0.675BiFeO_3-0.325BaTiO_3)-xLiTaO_3$ (BFBTLT, x = 0, 0.01, 0.02, and 0.03, with 0.6 mol% $MnO_2$ and 0.4 mol% CuO) were prepared by a solid state reaction method, followed by air quenching and their crystalline phase, morphology, dielectric, ferroelectric and piezoelectric properties were explored. An X-ray diffraction study indicates that lithium (Li) and tantalum (Ta) were fully incorporated in the BFBT materials with the absence of any secondary phases. Dense ceramic samples (> 92 %) with a wide range of grain sizes from $3.70{\mu}m$ to $1.82{\mu}m$ were obtained in the selected compositions ($0{\leq}x{\leq}0.03$) of BFBTLT system. The maximum temperatures ($T_{max}$) were mostly higher than $420^{\circ}C$ in the studied composition range. The maximum values of maximum polarization ($P_{max}{\approx}31.01{\mu}C/cm^2$), remnant polarization ($P_{rem}{\approx}22.82{\mu}C/cm^2$) and static piezoelectric constant ($d_{33}{\approx}145pC/N$) were obtained at BFBT-0.01LT composition with 0.6 mol% $MnO_2$ and 0.4 mol% CuO. This study demonstrates that the high $T_{max}$ and $d_{33}$ for BFBTLT ceramics are favorable for industrial applications.

Dielectric and Piezoelectric Characteristics of Low Temperature Sintering 0.20Pb(Zn1/3Nb2/3)O3-0.80Pb(Zr0.48Ti0.52)O3 Ceramics with the Addition of Sintering Aid ZnO (소결조제 ZnO 첨가에 따른 저온소결 0.20Pb(Zn1/3Nb2/3)O3-0.80Pb(Zr0.48Ti0.52)O3 세라믹스의 유전 및 압전특성)

  • Yoo, Ju-Hyun;Lee, Yu-Hyong;Kim, Do-Hyung;Lee, Il-Ha;Kwon, Jun-Sik;Paik, Dong-Soo
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.21 no.2
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    • pp.126-130
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    • 2008
  • In this study, in order to develop low loss multilayer piezoelectric actuator, PZN-PZT ceramics were fabricated using $Li_2CO_3,\;Bi_2O_3$, CuO and ZnO as sintering aids, their structural, piezoelectric and dielectric characteristics were investigated according to the amount of ZnO addition, At the sintering temperature of $870^{\circ}C$, the density, electromechanical coupling factor(kp), mechanical quality factor(Qm), dielectric constant(${\epsilon}_r$) and piezoelectric constant($d_{33}$) of 0.4 wt% ZnO added specimen (sintered at $870^{\circ}C$) showed the optimum value of $7.812g/cm^3$, 0.535, 916, 1399, 335 pC/N respectively. Taking into consideration above piezoelectric properties of the specimen sintered at low temperature, it was concluded that PZN-PZT ceramics using 0.4 wt% ZnO as additive showed the optimum characteristics as the composition ceramics for low loss multilayer piezoelectric actuator application.

A Study on the Dielectric and Piezoelectric properties of Low temperature sintering CW-PMN-PZT Ceramics according to the amount of $MnO_2$ addition ($MnO_2$ 첨가에 따른 저온소결 PCW-PMN-PZT 세라믹스의 유전 및 압전특성에 관한 연구)

  • Chung, Kwang-Hyun;Lee, Duck-Chool;Yoo, Ju-Hyun;Park, Chang-Yub;Jeong, Yeong-Ho
    • Proceedings of the KIEE Conference
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    • 2004.11a
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    • pp.82-85
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    • 2004
  • In this study, in order to increase piezoelectric properties of the low temperature sintering ceramics for multilayer piezoelectric transformer, PCW-PMN-PZT ceramics added with $Li_2CO_3$, $Bi_2O_3$ and CuO as sintering aids were manufactured according to the amount of $MnO_2$ addition, and their microstructural, dielectric and piezoelectric properties were investigated. When the sintering aids was added, specimens could be sintered at $950^{\circ}C$. However, sintering aids added specimens showed lower piezoelectric properties than those of non-added specimens. $0.1wt%MnO_2$ added specimen at $950^{\circ}C$ showed ${\varepsilon}_r$, of 1503, $k_p$ of 0.57 and $Q_m$ of 1502 were shown, respectively, and showed optimum properties for multilayer piezoelectric transformer.

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Piezoelectric and Dielectric Properties of Low Temperature Sintering Pb(Zn1/2W1/2)O3-Pb(Mn1/2Nb2/3)O3-Pb(Zr0.48Ti0.52)O3 Ceramics Manufactured by Post-annealing Method (Post-annealing 방법으로 제작된 저온소결 Pb(Zn1/2W1/2)O3-Pb(Mn1/2Nb2/3)O3-Pb(Zr0.48Ti0.52)O3 세라믹의 압전 및 유전특성)

  • Yoo, Ju-Hyun;Lee, Kab-Soo
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.21 no.3
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    • pp.227-231
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    • 2008
  • In this study, in order to improve the electrical properties of low temperature sintering piezoelectric ceramics, $[0.05Pb(Zn_{1/2}W_{1/2})-0.07Pb(Mn_{1/3}Nb_{2/3})-0.088Pb(Zr_{0.48}Ti_{0.52})]O_3$(abbreviated as PZW-PMN-PZT) ceramic systems were fabricated using $Bi_2O_3$, CuO and $Li_2CO_3$ as sintering aids and then their piezoelectric and dielectric properties were investigated according to the amount of $Li_2CO_3$ and post-annealing process. Post-annealing process enhanced all physical properties except for mechanical quality factor (Qm). 0.2 wt% $Li_2CO_3$ added and post-annealed specimen showed the excellent values suitable for low loss piezoelectric actuator application as follow: the density = 7.86 $g/cm^3$ electromechanical coupling factor (kp) = 0.575, piezoelectric constant $d_{33}$ = 370 pC/N, dielectric constant ($\varepsilon_r$) = 1546, and mechanical quality factor (Qm) = 1161, respectively.

Dielectric and Piezoelectric Properties of BNT-PNN-PZT system Ceramics (BNT-PNN-PZT계 세라믹스의 유전 및 압전특성에 관한 연구)

  • 유주현;홍재일;임인호;정희승;윤현상;박창엽
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1995.11a
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    • pp.44-47
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    • 1995
  • In this study, dielectric and piezoelectric properties of 0.4[0.1Bi(Ni$\_$1/2/Ti$\_$1/2/)O$_3$0.9Pb(Ni$\_$1/3/Nb$\_$2/3/)O$_3$]-0.6(PbZr$\_$y/Ti$\_$1-y/)O$_3$ceramics with Zr/Ti ratio were observed. As a results, structure of the ceramics with ZrO$_2$(y) 0.425 and 0.45 was MPB. Electromechanical coupling coefficients k$\_$p/, k$\_$31/ of the BN$\_$162/ specimen were 57.2%, 35.6% and piezoelectric constants d$\_$33/, d$\_$31/ were 720, 298[x10$\_$-12/C/N).

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Piezoelectric properties of Pb-free BNKT ceramics with ZnO addition (ZnO첨가에 따른 무연 BNKT계 세라믹스의 압전특성)

  • Ryu, Sung-Lim;Kim, Ju-Hyun;Lee, Mi-Young;Yoo, Ju-Hyun;Seo, Sang-Hyun;Chung, Kwang-Hyun
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2005.11a
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    • pp.193-195
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    • 2005
  • [ $0.96[Bi_{0.5}(Na_{0.84}K_{0.16})_{0.5}TiO_3]+0.04SrTiO_3+0.3wt%Nb_2O_5+0.2wt%La_2O_3+xwt%ZnO$ ], were studied in order to develope the superior piezoelectric properties of Lead-free piezoelectric ceramics. With increasing amount of ZnO addition, density showed the maximum value of 5.79(g/$cm^3$) at 0wt% ZnO addition, and electromechanical coupling factor($k_p$) and dielectric constant decreased, and mechanical quality factor($Q_m$) increased and showed the maximum value of 280 at 0.4wt% ZnO addition.

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Ferroelectric to Relaxor Transition Behavior in Lead-Free Ternary (Bi0.5Na0.5)TiO3-BiFeO3-SrTiO3 Piezoceramics (Bi0.5Na0.5TiO3-BiFeO3-SrTiO3 삼성분계 무연 압전 세라믹스의 강유전체-완화형 강유전체 상전이 거동)

  • Lee, Sang Sub;Lee, Chang-Heon;Duong, Trang An;Nguyen, Hoang Thien Khoi;Han, Hyoung-Su;Lee, Jae-Shin
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.34 no.1
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    • pp.1-7
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    • 2021
  • This study investigated the structural, dielectric, ferroelectric, and strain properties of (0.98-x)Bi1/2Na1/2TiO3-0.02BiFeO3-xSrTiO3 (BNT-BF-100xST, x=0.20, 0.22, 0.24, 0.26, and 0.28). All samples were successfully synthesized using the conventional solid-state reaction method and sintered at 1,175℃ for 2 h. The average grain size of the BNT-BF-100x ceramics decreased with increasing ST content. Furthermore, we observed that the ferroelectric- relaxor transition temperature (TF-R) decreased with increasing ST content, which eventually vanished in the BNT-BF-24ST ceramics. The results indicated that a ferroelectric to relaxor phase transition could be induced by ST modification. Consequently, a large electromechanical strain of 633 pm/V at 4 kV/mm was observed for the BNT-BF-26ST ceramics. These results imply that our materials have the competitive advantage of larger strain under lower operating field conditions compared with other BNT-based lead-free piezoelectric ceramics. We expect that BNT-BF-ST lead-free piezoelectric ceramics are promising candidates as a novel ternary BNT-based system and can find potential applications in actuators.