Low-Firing Pb(Zr,Ti)O_3-Based Multilayer Ceramic Actuators Using Ag Inner Electrode

다국어 초록 (Multilingual Abstract)

We investigated the low firing of Li_2CO_3 added 0.2Pb(Mg_(1/3)Nb_(2/3))O_3 - 0.3Pb(Fe_(1/)2Nb_(1/2)) - 0.5Pb(Zr_(0.475)Ti_(0.525))O_3 (PMNPFN-PZT) ceramics and multilayer actuators (MLAs) using Ag inner electrodes. It was found that 0.1 wt% Li_2CO_3 was quite effective in lowering the sintering temperature of PMN-PFN-PZT ceramics from 1,100℃ down to 900℃ without deteriorating their piezoelectric ceramics (d_(33) = 425 pC/N and k_p = 61.9%). However, excess Li_2CO_3 up to 0.3 wt% brings about unwanted problems such as the formation of a LiPbO_2 secondary phase and subsequent degradation in the piezoelectric properties. Using 0.1 wt% Li2_CO_3 added PMN-PFN-PZT ceramics, MLAs with Ag inner electrodes were successfully fabricated, resulting in a normalized strain of 580 pm/V at an electric field of 1.5 kV/mm.

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