US2018315916A1PendingUtilityA1

Ceramic

Assignee: BELL ANDREW JOHNPriority: Jul 28, 2010Filed: Jul 9, 2018Published: Nov 1, 2018

Est. expiryJul 28, 2030(~4 yrs left)· nominal 20-yr term from priority

Inventors:Andrew John Bell Timothy Paul Alistair Comyn

C04B 35/26H01L 41/43C04B 2235/656C04B 35/475C04B 2235/765C04B 2235/6567C04B 2235/77H01L 41/187C04B 2235/6565C04B 35/462C04B 2235/3232C04B 2235/768C04B 2235/3201C04B 2235/81C04B 2235/766C04B 2235/76C04B 2235/3272C04B 2235/3298C04B 2235/3296C04B 2235/6562H01L 41/1878C04B 2235/3275H10N 30/8548H10N 30/8561H10N 30/097H10N 30/8542H10N 30/853C04B 35/478

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References

Claims

Abstract

The present invention relates to a ceramic comprising (or consisting essentially of) a solid solution containing Bi, K, Ti and Fe (and optionally Pb) which exhibits piezoelectric behaviour.

Claims

exact text as granted — not AI-modified

1 . A ceramic comprising a solid solution of formula:
     x (Bi a K 1-a )TiO 3   −y Bi[Fe,B]O 3   −z PbTiO 3      wherein 0.4≤a≤0.6;   0&lt;x&lt;1;   0&lt;y&lt;1;   0&lt;z≤0.5;   x+y+z=1; and   B is a B-site metal dopant which has a higher valency than the valency of the metal which it substitutes or has a mixed valency, wherein B is present on the B-site in an amount greater than 0 and less than or equal to 50 at %,   
       wherein the ceramic is substantially free of non-perovskite phases, and wherein the average valence of the A-site plus the average valence of the B-site is 6. 
     
     
         2 . A ceramic comprising a solid solution of formula:
     x (Bi a K 1-a )TiO 3   −y Bi[Fe,B]O 3   −z PbTiO 3      wherein 0.4≤a≤0.6;   0&lt;x&lt;1;   0&lt;y&lt;1;   0&lt;z≤0.5;   x+y+z=1; and   B is a B-site metal dopant selected from the group consisting of Ti, Zr, W, Nb, V, Ta, Mo and Mn, wherein B is present on the B-site in an amount greater than 0 and less than or equal to 50 at %,   
       wherein the ceramic is substantially free of non-perovskite phases. 
     
     
         3 . A ceramic comprising a solid solution of formula:
     x (Bi a   k   1-a )TiO 3   −y Bi[Fe,B]O 3   −z PbTiO 3      wherein 0.45≤a≤0.6;   0&lt;x&lt;1;   0&lt;y&lt;1;   0&lt;z≤0.5;   x+y+z=1; and   
       B is a B-site metal dopant selected from the group consisting of Ti, Co and Ni, wherein 
       B is present on the B-site in an amount greater than 0 and less than or equal to 50 at %, 
       wherein the ceramic is substantially free of non-perovskite phases.

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