Electromechanical actuators
AssigneeMassachusetts Institute of Technology
InventorsYet-Ming Chiang, Sossity A. Sheets, Gregory W. Farrey, Nesbitt W. Hagood, IV, Andrey Soukhojak, Haifeng Wang
Life of this patent
Estimating the term…
Abstract
A perovskite compound of the formula, (Na1/2Bi1/2)1-xMx(Ti1-yM′y)O3±z, where M is one or more of Ca, Sr, Ba, Pb, Y, La, Pr, Nd, Sm, Eu, Gd, Th, Dy, Ho, Er, Tm, Yb and Lu; and M′ is one or more of Zr, Hf, Sn, Ge, Mg, Zn, Al, Sc, Ga, Nb, Mo, Sb, Ta, W, Cr, Mn, Fe, Co and Ni, and 0.01<x<0.3, and 0.01<y<0.3, and z<0.1 functions as an electromechanically active material. The material may possess electrostrictive or piezoelectric characteristics.
Claims34
An electromechanically active material comprising:
- a perovskite compound of the formula, (Na1/2Bi1/2)1-xMx(Ti1-yM′y)O3±z,
- where M is one or more of Ca, Sr, Ba, Pb, Y, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu;
- and M′ is one or more of Zr, Hf, Sn, Ge, Mg, Zn, Al, Sc, Ga, Nb, Mo, Sb, Ta, W, Cr, Mn, Fe, Co and Ni, and 0.01<x<0.3, and 0.01<y<0.3, and z<0.1.
An electromechanically active material comprising:
- a perovskite compound of the formula, (Na1/2Bi1/2)1-xMx(Ti1-yM′y)O3±z,
- where M is one or more of Ca, Sr, Ba, and Pb;
- and M′ is one or more of Zr, Hf, and Sn, and 0.01<x<0.3, and 0.01<y<0.2, and z<0.1.
An electromechanically active material comprising:
- a perovskite compound of the formula, (Na1/2Bi1/2)1-xBax(Ti1-yM′y)O3±z,
- where M′ is one or more of Zr and Hf, and 0.01<x<0.2, 0.01<y<0.1, and z<0.1.
An electromechanically active material comprising:
- a perovskite compound of the formula, (Na1/2Bi1/2)1-xMx(Ti1-yM′y)O3±z,
- where M is one or more of Ca, Sr, Ba, Pb, Y, La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu;
- and M′ is one or more of Zr, Hf, Sn, Ge, Mg, Zn, Al, Sc, Ga, Nb, Mo, Sb, Ta, W, Cr, Mn, Co and Ni, and 0.01<x<0.3, and 0.01<y<0.3, and z<0.1.
An electromechanically active material comprising:
- a perovskite material having tetragonal crystal symmetry of the formula, MαBiβM′γM″δO3±z,
- where M is one or more of Na, K, Rb and Cs, wherein M comprises at least Na;
- M′ is one or more of Ca, Sr, Ba, Pb, Y, La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu;
- M″ is one or more of Ti, Zr, Hf, Sn, Ge, Mg, Zn, Al, Sc, Ga, Nb, Mo, Sb, Ta, W, Cr, Mn, Fe, Co and Ni;
- where z≦0.1;
- α+β+γ+δ<2.0;
- α<β;
- and
- β<0.05.
An electromechanically active material comprising:
- a single crystal perovskite material of the formula Mα, BiβM′γM″δO3±z, where M is one or more of Na, K, Rb and Cs;
- M′ is one or more of Ca, Sr, Ba, Pb, Y, La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu;
- and M″ is one or more of Ti, Zr, Hf, Sn, Ge, Mg, Zn, Al, Sc, Ga, Nb, Mo, Sb, Ta, W, Cr, Mn, Fe, Co and Ni;
- where z≦0.1;
- 0.9≦δ≦1.1;
- α, β and γ are greater than zero;
- and (α+β+γ) is in the range of about 0.75 to 1.1.
An electromechanically active material comprising:
- a perovskite material of the formula, NaωMαBiβM′γM″δO3±z,
- where M is one or more of K, Rb and Cs;
- M′ is one or more of Ca, Sr, Ba, Pb, Y, La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu;
- M″ is one or more of Ti, Zr, Hf, Sn, Ge, Mg, Zn, Al, Sc, Ga, Nb, Mo, Sb, Ta, W, Cr, Mn, Fe, Co and Ni;
- where z≦0.1;
- 0.9≦δ≦1.1;
- α, β, γ and ω are greater than zero;
- and (α+β+γ+ω)is in the range of about 0.75 to 1.1.
Dependencies are inferred from the claim text.