• 제목/요약/키워드: piezoelectric constant

검색결과 477건 처리시간 0.032초

소결온도에 따른 NKN-LST 세라믹스의 구조 및 압전 특성 (Structure and piezoelectric properties of NKN-LST ceramics with sintering temperature)

  • 이영희;백상돈;최의선;김재식;배기범
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2011년도 제42회 하계학술대회
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    • pp.1434-1435
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    • 2011
  • In this study, NKN-LST ceramics were prepared by a conventional mixed oxide method and their structure and piezoelectric properties were investigated with the variations of sintering temperature. It was observed that the various sintering temperatures influenced the electrical properties and structural properties of the NKN-LST ceramics. It was found that the piezoelectric properties of NKN-LST ceramic sintered at $1080^{\circ}C$ for 4h has a piezoelectric constant and a planar electromechanical coupling coefficient of 161pC/N and 0.311% respectively. This ceramics look very promising as possible, practicable, lead-free replacements for lead zirconate titanate.

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저온소결 PSN-PZT 세라믹스의 Zr/Ti 비에 따른 압전특성 (Piezoelectric characteristics of Low temperature sintering ceramics according to Zr/Ti ratio)

  • 우원희;류성림;류주현;오동언;홍재일;이상호
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2003년도 하계학술대회 논문집 Vol.4 No.2
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    • pp.656-659
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    • 2003
  • In this study, in order to develop the low temperature sintering ceramics for multilayer piezoelectric transformer, dielectric and piezoelectric properties of PSN-PZT ceramics were investigated according to Zr/Ti ratio. As Zr/Ti ratio is increased, coupling factor(kp) and dielectric constant were increased and then decreased after the ratio of Zr/Ti=50/50. And also, mechanical quality factor were decreased and then increased after the ratio of Zr/Ti=50/50.

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시트 체크밸브를 갖는 압전펌프 설계 및 펌프 실험장치 제작 (Design and Test Rig Construction for Piezoelectric Pump having Sheet Type Check Valve)

  • 함영복;유진산;윤소남;최성대
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2003년도 춘계학술대회 논문집
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    • pp.1442-1445
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    • 2003
  • In precision machinery industry, it's required with small size and low noise design to using in constant liquid delivery equipment. To accomplish it's purpose, we designed the check valve with rubber sheet of circle shapes as a possible assembly in pump body. The test equipment for piezoelectric pump was able to test pressure-flow property and output property of piezoelectric pump by variation(magnitude of voltage and frequency) of input power.

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분극조건에 따른 무연 $NaKNbO_3$ 세라믹스의 압전 및 유전 특성 (Piezoelectric and Dielectric Characteristics of $NaKNbO_3$ ceramics according to the poling condition)

  • 이상호;류주현;이갑수
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2005년도 추계학술대회 논문집 전기물성,응용부문
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    • pp.157-159
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    • 2005
  • In this study, in order to develop Pb-free piezoelectric ceramics, $[Li_{0.04}(Na_{0.44}K_{0.52)-(Nb_{0.86}Ta_{0.10}Sb_{0.04})]O_3$ ceramics were fabricated by conventional mixed oxide method and their piezoelectric characteristics were investigated according to the poling condition. The transition temperature from orthorhombic phase to tetragonal phase observed at $93[^{\circ}C]$ and Curie temperature was $346[^{\circ}C]$. At $50[^{\circ}C]$ poling temperature, dielectric constant, electromecha nical coupling factor kp, piezoelectric $d_{33}$ const ant, coercive field Ec, remanant polarization Pr and mechanical quality factor Qm showed the optimum value of 737, 0.45, 209[pC/N], 1l.34[kV/cm], $7.14[{\mu}C/cm^2]$ and 205, respectively.

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PMN 치환량에 따른 저온소결 PMN-PZT 세라믹스의 유전 및 압전특성 (Piezoelectric and Dielectric Characteristics of Low Temperature Sintering PMN-PZT ceramics with the amount of PMN substitution)

  • 김국진;류주현;이창배;이상호;홍재일
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2005년도 추계학술대회 논문집 Vol.18
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    • pp.178-180
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    • 2005
  • In this study, in order to develop multilayer low temperature sintering piezoelectric transformer, $Pb_{0.97}Sr_{0.03}[(Mn_{1/3}Nb_{2/3})x(Zr_{0.48}Ti_{0.52})_{1-x}O_3]+$ 0.25wt% $CeO_2$+0.3 wt% $Nb_2O_5$ system ceramics were fabricated using $Li_2CO_3-CaCO_3$ and CuO as sintering aids and their piezoelectric and dielectric characteristics were investigated with the amount of PMN substitution. With increasing PMN substitution, electromechanical coupling factor kp and dielectric constant were increased.

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Microstructural and Piezoelectric Characteristics of PSN-PMN-PZT Ceramics Produced by Attrition Milling

  • Juhyun Yoo;Sukkyu Min;Jaeil Hong;Sungjae Suh;R, Soonchul-U
    • Transactions on Electrical and Electronic Materials
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    • 제2권3호
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    • pp.18-23
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    • 2001
  • For the piezoelectric transformer application, Pb(Sb$\_$1/2/ Nb$\_$1/2/)O$_3$-Pb(Zr,Ti)O$_3$ ceramics were produced by attrition milling. Microstructural, dielectric and piezoelectric characteristics of the ceramics were investigated as a function of milling time. The particle size and grain size decreased while dielectric constant, density and mechanical quality factor (Q$\_$m/) increased with milling time. Temperature coefficient of resonant frequency (TCf$\_$r/) was shifted to positive side with increasing milling time. The attrition milling process proved to be one of the effective routes to produce transformers for high power application.

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Cr2O3 첨가에 따른 PSS-PZT 압전 세라믹스의 유전 및 압전 특성 (Dielectric and Piezoelectric Characteristics of PSS-PZT Piezoelectric Ceramics with CrS12TOS13t Addition)

  • 홍재일;이개명;윤석진;유주현;박창엽
    • 대한전기학회논문지
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    • 제41권6호
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    • pp.687-693
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    • 1992
  • To improve dielectric, piezoelectric and temperature stability in 0.50Pb(SnS11/2TSbS11/2T)OS13T - 0.35PbTiOS13T - 0.60PbZrOS13T + 0.4[wt%]MnOS12T piezoelectric ceramics which is used for surface acoustic wave devices, CrS12TOS13T was added and the specimens were fabricated by Hot Press method, and their characteristics were measured with CrS12TOS13T addition. From the results, in the specimen added by 0.2[wt%]CrS12TOS13T, dielectric constant and mechanical quality factor were 380 and 2307, respectively, and it was suited for surface acoustic wave device and the temperature coefficient of the resonant frequency in the specimen added by 0.4[wt%]CrS12TOS13T was the least value of 74.96[ppm/$^{\circ}C$].

압전효과에 의한 적층 세라믹 콘덴서의 거동 분석 (Study on behavior of multilayer ceramic capacitor caused by piezoelectricity)

  • 박노철;고병한;박영필;안영규
    • 정보저장시스템학회논문집
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    • 제10권2호
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    • pp.61-64
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    • 2014
  • Vibration and acoustic noise arise from the Multilayer Ceramic Capacitor (MLCC) because of the piezoelectric effect of dielectric substance which consists of $BaTiO_3$. However, the phenomenon is not analyzed clearly because the MLCC shows different behavior compare with ordinary piezoelectric substance like PZT. Thus, MLCC was tested under the several DC bias conditions and heat treatment effect was also tested and analyzed in this paper. From the test, MLCC shows not only piezoelectric effect but also another physical phenomenon like electrostriction. Also, it was verified that DC bias affect to the piezoelectric constant of MLCC.

저온소결 PMgN-PMnN-PZT 세라믹스의 압전 및 유전 특성 (Piezoelectric and Dielectric Characteristics of Low Temperature Sintering PMgN-PMnN-PZT Ceramics)

  • 이상호;류주현;홍재일;정광현;정영호
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2006년도 제37회 하계학술대회 논문집 C
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    • pp.1400-1401
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    • 2006
  • In this study, in order to develop low temperature sintering piezoelectric ceramics for multilayer piezoelectric actuator, $PbSr(Mn_{1/3}Nb_{2/3})O_3-(Mg_{1/3}Nb_{2/3})O_3-(ZrTi)O_3$ ceramics were fabricated using $Na_{2}CO_{3}-Li_{2}CO_{3}$ as sintering aids and their piezoelectric and dielectric characteristics were investigated according to the sintering tempo rature. At the sintering temperature of $900^{\circ}C$, the density, electrom echanical coupling factor(kp), mechanical quality factor(Qm) and dielectric constant(${\varepsilon}r$) of specimen showed the optimum value of $7.730[g/cm^2]$, 0.552, 1134, 1492 and 330[pC/N], respectively.

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승온속도에 따른 저온소결 PMN-PNN-PZT 세라믹스의 유전 및 압전특성 (Dielectric and Piezoelectric Characteristic of Low Temperature Sintering PMN-PNN-PZT Ceramics according to the Heating Rate)

  • 김국진;류주현;홍재일
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2007년도 추계학술대회 논문집
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    • pp.253-254
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    • 2007
  • In this study, in order to develop low temperature sintering multilayer piezoelectric actuator, PMN-PNN-PZT system ceramics were fabricated using $Li_2CO_3-Bi_2O_3$-CuO as sintering aids and their piezoelectric and dielectric characteristics were investigated as a function of heating rate. At sintering temperature of $900^{\circ}C$, with increasing heating rate, electromechanical coupling factor(kp), mechanical quality factor(Qm) and dielectric constant $({\varepsilon}_r)$ were increased.

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