Patent ID: 7697263

Claim:
A dielectric material for use in a capacitor comprising sodium bismuth titantate in which titanium is partially substituted by 5-valent ions and sodium and/or bismuth is substituted by monovalent ions, wherein the material corresponds to the formula: {[(Na 0.5-x +Me 1 x )(Bi 0.5-t +Me 3 t )] 1-s +Me 2 s } 1-w {Ti 1-z +Me 4 z } 1-w O 3-3w +{Me 1 w-y +Me 5 w-y +Me 6 y }O 3w where Me 1 is a monovalent metal ion selected from Li, Na, K, Rb, Ag and Cu or combinations thereof, Me 2 is a divalent metal ion selected from Ba, Ca, Mg, Pb and/or Sr or combinations thereof, Me 3 is a trivalent metal ion selected from La and its series in the periodic table, Y, Dy, Sm, or combinations thereof, Me 4 is a tetravalent metal ion selected from Hf, Zr and Sn or combinations thereof, Me 5 is a 5-valent ion selected from Nb, Ta, P, Sb or combinations thereof, and Me 6 is a 6-valent ion including W and wherein x<0.01, 0.05<s<0.6, t<0.01, z<0.01, 0<w<0.2 and y<0.01.