NBT based lead-free piezoelectric materials for high power applications
AssigneeThe Penn State Research Foundation
InventorsShujun Zhang, Hyeong Jae Lee, Thomas R. Shrout
Life of this patent
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Abstract
Piezoelectric compounds of the formula xNamBinTiO3-yKmBinTiO3-zLimBinTiO3-pBaTiO3 where (0<x≦1), (0≦y≦1), (0≦z≦1), (0.3≦m≦0.7), (0.3≦n≦0.7), (0<p≦1) (0.9≦m/n≦1.1) as well as to doped variations thereof are disclosed. The material is suitable for high power applications.
Claims17
A piezoelectric compound having the formula xNamBinTiO3-yKmBinTiO3-zLimBinTiO3-pBaTiO3 where (0<x≦1), (0≦y≦1), (0≦z≦1), (0<p≦1), (x+y+z+p=1), (0.3≦m≦0.7), (0.3≦n≦0.7), (0.9≦m/n≦1.1).
A piezoelectric compound having the formula ((xNamBinTiO3-yKmBinTiO3-zLimBinTiO3-pBaTiO3)-rM) where (0<x≦1), (0≦y≦1), (0≦z≦1), (0<p≦1), (x+y+z+p=1), (0.3≦m≦0.7), (0.3≦n≦0.7), (0.9≦m/n≦Li) and (0 wt %≦r≦5 wt %) where r is based on the weight of a compound within the scope of xNamBinTiO3-yKmBinTiO3-zLimBinTiO3-pBaTiO3 and M is a dopant selected from the group consisting of Al2O3, CoO, CO2O3, Re2O3 where Re is rare earth element, NiCO3, MnO2, MnCO3, Fe2O3, fluoride and mixtures thereof.
A piezoelectric compound having the formula xNamBinTiO3-yKmBinTiO3-zLimBanTiO3 where (0<x≦1), (0<y≦1), (0≦z≦1), (x+y+z=1), (0.3≦m≦0.7), (0.3≦n≦0.7), (0.9≦m+n≦1.1) and (0.9≦m/n≦1.1).
A piezoelectric compound having the formula ((xNamBinTiO3-yKmBinTiO3-zLimBanTiO3)-vN) where (0<x≦1), (0<y≦1), (0≦z≦1), (x+y+z=1), (0.3≦m≦0.7), (0.3≦n≦0.7), (0.9≦m/n≦1.1), (0.9<m+n≦1.1) and N is a dopant selected from the group consisting of Al2O3, CoO, CO2O3, Re2O3 where Re is rare earth element, NiCO3, MnO2, MnCO3, Fe2O3, fluoride and mixtures thereof and where (0<v≦5 wt %) where v is based on the weight of a compound within the scope of the formula xNamBinTiO3-yKmBinTiO3-zLimBanTiO3.
A piezoelectric compound having the formula (xNamBinTiO3-yLimBinTiO3-zBaTiO3)(III) where (0<x≦1), (0<y≦1), (0<z≦1), (x+y+z=1), (0.3<m<0.7), (0.3<n<0.7), (0.9<m+n≦1.1) and (0.9≦m/n≦1.1).
A piezoelectric compound having the formula ((xNamBinTiO3-yLimBinTiO3-zBaTiO3)-wN) where (0<x≦1), (0<y≦1), (0<z≦1), (x+y+z=1), (0.3≦m≦0.7), (0.3≦n≦0.7), (0.9<m+n≦1.1), (0.9≦m/n≦1.1) and (0<w≦5 wt %) where w is based on the weight of a compound within the scope of the formula xNamBinTiO3-yLimBinTiO3-zBaTiO3 and where N is a dopant selected from the group consisting of Al2O3, CoO, CO2O3, Re2O3 where Re is rare earth element, NiCO3, MnO2, MnCO3, Fe2O3, fluoride and mixtures thereof.
A piezoelectric compound having the formula xNa0.5Bi0.5TiO3-yLi0.5Bi0.5TiO3-zBaTiO3 where (0.3≦x≦0.95), (0<y≦0.7), (0<z≦0.2) and (x+y+z=1).
A method of manufacture of a piezoelectric compound of the formula xNa0.5Bi0.5TiO3-yK0.5Bi0.5TiO3-zBaTiO3 where (0<x≦1), (0<y≦1), (0<z≦1) and (x+y+z=1) comprising, forming a mixture of K2CO3, Na2CO3, Li2CO3, BaCO3, Bi2O3 or TiO2 starting materials in amounts suitable for yielding a compound within xNa0.5Bi0.5TiO3-yK0.5Bi0.5TiO3-zBaTiO3, calcining the mixture at about 800 C to about 950 C for about 0.5 hrs to about 2 hrs to yield a calcined mixture, milling the calcined mixture to a particle size of about 0.5 microns to about 2 microns to produce a calcined mixture, compressing the calcined mixture at about 3000PSI to about 10000PSI to yield a preform, heating the preform to about 500° C. to about 600° C. to yield a green preform sintering the green preform at about 1060° C. to about 1220° C. for about 0.5 hrs to about 2 hrs to yield a piezoelectric compound of the formula xNa0.5Bi0.5TiO3-yK0.5Bi0.5TiO3-zBaTiO3 where (0<x≦1), (0<y≦1), (0<z≦1) and (x+y+z=1).
A method of manufacture of a piezoelectric compound of the formula (xNa0.5Bi0.5TiO3-yK0.5Bi0.5TiO3-zBaTiO3)-rM where (0<x≦1), (0<y≦1), (0<z≦1), (x+y+z=1), (0<r≦5 wt %) and M is a dopant comprising, forming a mixture of K2CO3, Na2CO3, Li2CO3, BaCO3, Bi2O3 or TiO2 starting materials in amounts suitable for yielding a compound within the formula xNa0.5Bi0.5TiO3-yK0.5Bi0.5TiO3-zBaTiO3 where (0<x≦1), (0<y≦1), (0<z≦1), (x+y+z=1), calcining the mixture at about 800 C to about 950 C for about 0.5 hrs to about 2 hrs to yield a calcined mixture, blending a dopant M selected from the group consisting of Al2O3, COO, CO2O3, Re2O3 where Re is rare earth element, NiCO3, MnO2, MnCO3, Fe2O3, fluoride and mixtures thereof with the calcined mixture to produce a doped mixture,
- milling the doped mixture to a particle size of about 0.5 microns to about 2 microns to produce a calcined mixture, compressing the calcined mixture at about 3000PSI to about 10000PSI to yield a preform, heating the preform to about 500° C. to about 600° C. to yield a green preform, sintering the green preform at about 1060° C. to about 1220° C. for about 0.5 hrs to about 2 hrs to yield a piezoelectric compound of the formula (xNa0.5Bi0.5TiO3-yK0.5Bi0.5TiO3-zBaTiO3)-rM where (0<x≦1), (0<y≦1), (0<z≦1), (x+y+z=1), (0<r≦5 wt %).
Dependencies are inferred from the claim text.