Effects of internal electrode composition on the reliability of low-firing PMN–PZT multilayer ceramic actuators |
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| Authors: | Jae-Shin Mun-Seok Hyoung Su Young-Min Sunjung Ill Won Min Soo Soon Jong |
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| Affiliation: | aSchool of Materials Science and Engineering, University of Ulsan, Daehak-ro 102, Nam-gu, Ulsan 680-749, Republic of Korea;bDepartment of Physics, University of Ulsan, Ulsan 680-749, Republic of Korea;cElectric and Magnetic Devices Group, Korea Electrotechnology Research Institute, Gyungnam 641-600, Republic of Korea |
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| Abstract: | We investigated the effects of internal electrode composition on the reliability of low-firing multilayer ceramic actuators using Ag internal electrodes. Ag–ceramic composite pastes were prepared by adding Pb(Mg1/3Nb2/3)O3–Pb(Zr0.475,Ti0.525)O3 (PMNZT) ceramic powders to a commercial Ag paste at concentrations in the range of 0–60 vol%. PMNZT multilayered laminates were fabricated using tape casting, and then cofired at 925 °C for 10 h. The fatigue behaviors of multilayer actuators with Ag internal electrodes having different PMNZT concentrations were compared by applying a 2 kV/mm ac electric field at 50 °C under a relative humidity of 30%. The failure data were analyzed using Weibull statistics. The addition of PMNZT ceramics enhanced the mean time to failure by reducing the densification mismatch between the piezoelectric ceramic and internal electrode layers during the cofiring process. |
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| Keywords: | Multilayer actuator Reliability Internal electrode Piezoelectric ceramics |
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