Abstract
In this paper, for the application to multi-layer piezoelectric devices capable of being used in piezoelectric speakers, Pb(Ni1/3Nb2/3)O3-Pb(Zr,Ti)O3-BiFeO3 ceramics substituted with Pb(Mg1/2W1/2)O3 were manufactured according to MnO2 addition, and their physical properties were studied. At non-doped MnO2 added specimen, the maximum values of piezoelectric properties were shown, respectively: the εr of 2182, d33 of 513 pC/N, and kp of 0.634. When taking into consideration the low dielectric constant and high d33 in case of increasing the numbers of multilayer in ceramics, the x = 0.2 composition ceramics was suitable for the device application such as speaker using low-temperature sintering multilayer piezoelectric actuators.
Highlights
The regulations on hazardous substances have been strengthened
In the field of electronic ceramics, PZT system ceramics sintered above 1200 ◦C can cause in general the environmental pollution caused by PbO, which exhibits the rapid volatilization characteristics at around 1000 ◦C, because the PZT ceramics are composed of PbO over 60–70% [1,2,3,4]
In order to solve these problems, it is required to develop the low temperature sintering ceramics with high physical properties which can restrain the deteriorations of dielectric and piezoelectric properties in case of sintering at low temperature
Summary
The regulations on hazardous substances have been strengthened. In particular, the manufacture and disposal of environmental pollutants have been severely restricted across all the electrical and electronic products. The composition ceramics applied to the LG G-8 smartphone has a rather high dielectric constant [1] Such a high dielectric constant (εr) has caused a problem that a high power consumption is accompanied by an increase in capacitance (C) when the piezoelectric speaker is manufactured. The simultaneous firing process with Ag/Pd internal electrode should be applied during the lamination process for manufacturing the multilayer device In this process, in order to use inexpensive pure Ag/Pd = 95/05 as an electrode, the sintering temperature of the ceramic must be 920 ◦C or less. For manufacturing the ceramics sintered at low temperature for multilayer piezoelectric device application, Pb(Ni1/3Nb2/3)O3-Pb(Zr,Ti)O3-BiFeO3 composition ceramics substituted with Pb(Mg1/2W1/2)O3 with the piezoelectric d33 constant was selected and MnO2 was added, and their physical properties were studied
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