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압전 스피커 응용을 위한 PSN-PZT계 세라믹스의 미세구조 분석 및 전기적 특성 평가

Microstructures and Electrical Properties of PSN-PZT Ceramics for Piezoelectric Speaker

  • Kim, Sung-Jin (ZENIXON Co., LTD.) ;
  • Kweon, Soon-Yong (Department of Materials Science and Engineering, Korea National University of Transportation)
  • 투고 : 2018.11.21
  • 심사 : 2018.12.06
  • 발행 : 2019.03.01

초록

$Pb(Sb_{0.5}Nb_{0.5})_x(Zr_{0.51}Ti_{0.49})_{1-x}O_3$ (abbreviation: PSN-PZT) ceramics were synthesized, using conventional bulk ceramic processing technology, with various PSN doping contents. The maximum density of PSN-PZT was 97% of the theoretical density in the samples sintered at $1,250^{\circ}C$. The maximum values of the piezoelectric properties achieved using the conventional processes were: $k_p$ of 0.625, $d_{33}$ of 531 pC/N, and $g_{33}$ of $33mV{\cdot}m/N$. Finally, we fabricated a piezo-speaker with the optimized PSN-PZT ceramics. The SPL of the speaker was measured at a distance of 1 m, with a driving voltage of $40V_{rms}$ in the frequency range of ~300 Hz to 9 kHz. The measured $SPL_{max}$ was at a very high level (95 dB), which was superior in quality in comparison with those of other commercial products.

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Fig. 1. X-ray diffraction patterns of PSN-PZT ceramics at various PSN amounts of x (mole ratio): (a) 0.02, (b) 0.04, (c) 0.06, and (d) 0.08.

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Fig. 2. Sintering density of PSN-PZT ceramics as a function of PSN composition.

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Fig. 3. SEM images of PSN-PZT ceramics at various PSN compositions of x: (a) 0.02, (b) 0.04, (c) 0.06, and (d) 0.08.

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Fig. 4. Dependence of electromechanical coupling factor (kp) and mechanical quality factor (Qm) on PSN composition in PSN-PZT ceramics.

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Fig. 5. Variation of relative dielectric constant (ɛr) with different doping amounts of PSN in PSN-PZT ceramics.

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Fig. 6. Effects of PSN composition on piezoelectric charge constant (d33) and piezoelectric voltage constant (g33) in PSN-PZT ceramics.

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Fig. 7. The SPL of the piezoelectric speaker measured without (closed circle) and with (open square) an additional vibration media.

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