• Title/Summary/Keyword: Piezoelectric Ceramics

Search Result 831, Processing Time 0.027 seconds

Effect of $Li_2O$ Addition on Piezoelectric Properties of NKN-5LT Ceramics

  • Kim, Min-Soo;Lee, Dae-Su;Park, Eon-Cheol;Jeong, Soon-Jong;Kim, In-Sung;Song, Jae-Sung
    • Proceedings of the Korean Powder Metallurgy Institute Conference
    • /
    • 2006.09a
    • /
    • pp.694-695
    • /
    • 2006
  • As a candidate for lead-free piezoelectric materials, dense $95(Na_{0.5}K_{0.5})NbO_3-5LiTaO_3$ (NKN-5LT) ceramics were developed by conventional sintering process. Sintering temperature was lowered by adding $Li_2O$ as a sintering aid. The electrical properties of NKN-5LT ceramics were investigated as a function of $Li_2O$ concentration. At the addition of 1 mol% $Li_2O$, electromechanical coupling factor $(k_P)$ and piezoelectric coefficient $(d_{33})$ of NKN-5LT ceramics were found to reach the highest values of 0.37 and 250 pC/N, respectively.

  • PDF

Microstructure and Piezoelectric Characteristics of PSN-PZT Ceramics as a Function of PNW Substitution (PNW 치환에 따른 PSN-PZT 세라믹스의 미세구조 및 압전특성)

  • 류주현;우원희;오동언;류성림
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.16 no.10
    • /
    • pp.892-896
    • /
    • 2003
  • In this study, microstructure and piezoelectric properties of PSN-PZT ceramics modified with BiFeO$_3$ were investigated as a function of PNW substitution. With the increase of PNW substitution, tetragonality, Curie temperature and mechanical quality factor were decreased but grain size and electromechanical coupling factor(kp) was gradually increased. At 4 mol[%] PNW substitution, maximum kp of 0.567 was obtained.

Electrical Characteristics of the High Power Piezoelectric transformer Using PSN-PZT system ceramics (PSN-PZT계 세라믹스를 이용한 고출력 압전 트랜스포머의 전기적 특성)

  • 이용우;류주현;윤광희;정회승;서성재;김종선
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.13 no.4
    • /
    • pp.286-293
    • /
    • 2000
  • In this paper we investigated the structural dielectric and piezoelectric properties of 0.03Pb(Sb$\_$1/2//Nb$\_$1/2/)-0.97Pb(Zr$\_$0.495//Ti$\_$0.505/)O$_3$+0.5 wt% excess PbO + wt% MnO(X=0, 0.1, 0.3, 0.5, 0.7) ceramics to develop the high-power piezoelectric transformer. The piezoelectric transformers with dimension of 27.5$\times$27.5$\times$2.5[mm$^3$]were fabricated and their electrical properties were measured. Maxima of piezoelectric properties such as electro-mechanical coupling factor of 0.534 and mechanical quality factor of 1487 were obtained for the PSN-PZT with 0.3wt% MnO. voltage step-up ratios of piezoelectric transformers at 500[Ω]and no load were 0.78, 12.82, respectively. The maximum efficiency of piezoelectric transformer was 98.6% at 800[Ω]. While the 14W fluorescent lamp were driven by the piezoelectric transformer for more than 20[min], increment of temperature in the piezoelectric transformer was 7[$\^{C}$].

  • PDF

The Effect of Piezoelectric Properties on the Output Properties of Step-down Multilayer Piezoelectric Transformer (압전특성이 강압용 적층 압전변압기의 출력특성에 미치는 영향)

  • Kim, Kook-Jin;Yoo, Ju-Hyun;Paik, Dong-Soo;Yoon, Hyun-Sang
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2006.11a
    • /
    • pp.225-227
    • /
    • 2006
  • Multilayer step down piezoelectric transformers were manufactured using PZN-PMN-PZT and PMN-PNN-PZT ceramics respectively. Sintering temperature of the ceramics was $940^{\circ}C$. And then. their electrical properties were investigated according to the variations of frequency and load resistance. The voltage step-up ratio of multilayer piezoelectric transformer showed the maximum values in the vicinity of 69 and 71kHz, respectively. At the load resistance of $100{\Omega}$, the piezoelectric transformers showed the temperature rises of about 21 and $18^{\circ}C$ at the output power of 15W and 18W, respectively. At the transformer with high effective electromechanical coupling factor($k_{eff}$), lower temperature increase was appeared.

  • PDF

Characteristics of A Multilayer Piezoelectric Transformer Using PAN-PZT Ceramics (PAN-PZT계 세라믹스를 이용한 적층형압전변압기의 특성)

  • 박타리;이동균;최지원;신용덕;김현재;고태국;윤석진
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2002.07a
    • /
    • pp.143-146
    • /
    • 2002
  • The characteristics of a multilayer piezoelectric transformer were investigated using 0.05Pb(A $l_{0.5}$N $b_{0.5}$) $O_3$-0.95Pb(Z $r_{0.52}$ $Ti_{0.48}$) $O_3$+0.9wt%N $b_2$ $O_{5}$+0.5wt%Mn $O_2$+0.04wt% $V_2$ $O_{5}$ ceramics. The multilayer piezoelectric trans formers were developed for voltage step-up. The multilayer ceramic technology was applied in piezoelectric transformer. The electrical characteristics of the piezoelectric transformer (33x8.5x1mm) has the efficiency of above 85%, step-up ratio of 70 under the 130 kΩ load, and driving frequency of 93.5kHz, respectively.ctively.y.y.

  • PDF

The Characteristics of Piezoelectric Strian Constants on PNN-PZ-PT Ceramics (PNN-PZ-PT계 세라믹스의 압전변위특성)

  • 정수태;남효덕;조상희
    • Journal of the Korean Ceramic Society
    • /
    • v.26 no.6
    • /
    • pp.802-810
    • /
    • 1989
  • The temperature dependence of piezoelectric strain constant and the electric field induced strain are investigated as a function of PT in 0.5[xPT-(1-x)PZ]-0.5PNN ceramics. The piezoelectric strain constant d31 has the highest value(360$\times$10-12m/V) at PT=0.68. The temperature dependence of d31 is improved as Curie temperature of sample is increased, and the electric field dependence of induced strain is decreased with the coercive field increased. This ceramic system shows both piezoelectric effect and electrostrictive effect under the applied electric field. The piezoelectric of tetragonal phase is higher than that of rhombohedral phase, and the magnitude of electrostrictive constant is appeared in the order of morphotropic, rhombohedral and tetragonal phase. The piezoelectric strain constant with applied field must be considered theelectrostrictive effect due to 90$^{\circ}$domain wall displacements, and the displacement of bimorph type actuator agrees with the calulated value well.

  • PDF

Pulse-echo response of 1-3 type piezoelectric composite transducers for distance measurement (거리 측정용 1-3형 복합압전체 트랜스듀서의 펄스에코 응답 특성)

  • 최헌일;박정학;이수호;사공건
    • Electrical & Electronic Materials
    • /
    • v.8 no.2
    • /
    • pp.211-216
    • /
    • 1995
  • In this study, the piezoelectric ceramics/polymer composite transducers with 1-3 connectivity have been studied. A piezoelectric ceramics PZT prepared by Wet-Dry Combination method was used as a filler in polymer matrix Eccogel. We've got the pulse-echo response for 1-3 type piezc-electric composite transducers in water. It was shown that the transmitting and receiving sensitivity of 1-3 type piezoelectric composite transducers could be improved in comparison with that- of solid PZT transducers. The reason is for that 1-3 type Piezoelectric composites have low dielectric constant and density. There was in a good agreement between the resonant frequencies calculated from one period and observed results on the Ultrasonic Transducer Analyzer. According to these results we could be figured out the distance in water by virture of the pulse-echo response.

  • PDF

Design and Fabrication of Piezoelectric Generator Using Piezoelectric Ceramics (원판형 압전 세라믹을 이용한 압전 발전 장치의 설계 및 제작)

  • Jun, Ho-Ik;Jeoung, Sung-Su;Park, Tae-Gone
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2008.06a
    • /
    • pp.315-316
    • /
    • 2008
  • On this paper, piezoelectric generators using piezoelectric ceramics were designed and fabricated. Generators were made by attaching cymbal type metal plates on upper and bottom sides of a disc type piezoelectric ceramic. Generator converts wasting mechanical energy to electrical energy. Output voltage was increased when thickness of ceramic and displacement of vibration were increased. Temperature of the ceramic was increased when it generates, but the temperature rising was saturated at certain temperature.

  • PDF

Voltage Gain Characteristics of Piezoelectric Transformer Operation in Second Thickness Extensional Vibration Mode (2차 두께방향 지동모드로 동작되는 압전트랜스포머의 Voltage Gain 특성)

  • 김성진;이수호;류주현;임인호;홍재일
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.11 no.10
    • /
    • pp.855-860
    • /
    • 1998
  • This paper presents a new structure for a piezoelectric transformer, operating in thickness extensional vibration mode. Modified $PbTiO_3$ family ceramics were used for the piezoelectric transformer, because it was a material with large anisotropy between elecromechanical coupling factors $K_t$ and $K_p$ . The size of piezoelectric transformer was 20mn long, 20mm wide and 3.1mm thick. The second harmonic resonant frequency of thickness extensional vibration mode was 0.72MHz at loading resistance 100[$\omega$], And Voltage gin of piezoelectric ceramics showed 0.53 at resonant frequency of sencond thickness extensional vibration mode.

  • PDF

Electrical Properties of High Power Step Down Multilayer Piezoelectric Transformer using Low Temperature Sintering PMN-PNN-PZT Ceramics (저온소결 PMN-PNN-PZT 세라믹스를 이용한 고출력 강압용 적층 압전변압기의 전기적 특성)

  • Yoo, Ju-Hyun;Kim, Kook-Jin;Paik, Dong-Soo;Yoon, Hyun-Sang
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.20 no.4
    • /
    • pp.332-336
    • /
    • 2007
  • In this study, multilayer piezoelectric transformer was manufactured using the PMN-PNN-PZT ceramic and then the electrical characteristics were investigated according to the variations of frequency and load resistance. The voltage step-up ratio of multilayer piezoelectric transformer showed the maximum value at the vicinity of 75 kHz and increased according to the increase of load resistance. When the output impedance coincided with the load resistance, the multilayer piezoelectric transformer showed the temperature rise of less than $20^{\circ}C$ at the output power of 20 W. As the results, the multilayer piezoelectric transformer manufactured at low co-firing temperature of $940^{\circ}C$ using PMN-PNN-PZT ceramics could be stably driven as the step-down transformers.