In this study, Lead-free (Na 0.52 K 0.4425Li0.0375) (Nb 0.88 Sb 0.08 Ta 0.04) (NKLNS-xTa) piezoelectric ceramic with high piezoelectric properties is developed by a process called solid-state reaction method. The piezo-electric properties are discussed by changing the sintering temperature (1050-1110 ℃), and special attention was paid to the composition design through which the dielectric and piezoelectric properties of the (Li, Ta, Sb) modified NKN systems were significantly promoted.
The best composition ratios for (Na 0.52 K 0.4425 Li 0.0375) (Nb 0.88 Sb 0.08)-xTa (NKLNS-xTa) (x=0.04). The better piezoelectric properties, the d33=348 pC/N, d31=141.68 (pC/N) Kp = 48% and kt = 47%, and tanδ = 0.036, Qm=59.74 and dielectric constant (Ꜫ33T/Ꜫ0) = 2324 (at 1 kHz) When doped 0.1 mole %MnCO3, the piezo-electric and dielectric properties were improved and exhibited d33 = 364 pC/N, d31=143 (pC/N) Kp = 0.44%, Kt=0.45 Qm =126, tanδ = 0.032 ,Ꜫ33T/Ꜫ0 = 2400 (at 1 kHz).As 0.1 mole% MnCO3 doped NKN ceramics, the piezoelectric and dielectric properties can be improved and have the values of d33 = 364 pC/N, Kp = 0.44%, g33= 17.13 (mV.m/N), g15 = 16.2 (mV.m/N), g31= 6.73 (mV.m/N), Qm = 126, Ꜫ33T/Ꜫ0 = 2400 (at 1 kHz).
In addition, the high g value of ceramics composition (Na0.48K0.48Li0.04) NbO3 (NKLN) is developed. Before doped 0.1 mole % MnCO3, the piezo-electric and dielectric properties are d33 = 136 pC/N, Kp = 0.48%, Qm =59,Ꜫ33T/Ꜫ0 =410(at 1 kHz) tanδ = 0.031.With doping of 0.1 mole % MnCO3 optimum piezoelectric properties are the D33=167 pC/N, Kp = 42% and kt = 44%, g33= 40.7 (mV.m/N), g15 = 36(mV.m/N), g31= 13.6(mV.m/N), Qm = 90, Ꜫ33T/Ꜫ0 =465(at 1 kHz) and tanδ = 0.029. at 1090-1110℃ sintering temperature for 4 hours.
Later, this improved high g ceramic composition was used to make a ring shape of ceramic with a mechanical structure to assemble the accelerometer. A mechanical based structure was simulated using an ANSYS workbench software to achieve the optimum structure dimensions with high output voltage The properties obtained from the analysis result as g33= 40.7(mV.m/N), g15 = 36(mV.m/N), and g31=13.6 (mV.m/N). The modal Analysis in ANSYS shows that deformation is at 4th mode of Harmonic simulation 17365Hz and Harmonic Analysis shows the resonance frequency at 17 KHz.

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