Substituted barium-neodymium-titanium-perovskite, dielectric, ceramic composition, capacitor and microwave components

Abstract

Abstract A substituted barium-neodymium-titanium-perovskite which has a defect structure and which has the following general composition: [A' al ml+ A" a2 n2+ . . . A n ' an n .spsp.n + ▪ an+1 ] [B' b1 m1+ B" b2 m2 + . . . B m ' bm m .spsp.n +] O 3 , wherein the cations A' a1 n1+ A" a2 n2+ . . . A n ' an n .spsp.n + at least comprise Ba 2+ , Nd 3+ and, optionally, one or more cations of the group consisting of Cs 1+ , Rb 1+ , Tl 1+ , K 1+ , Pb 2+ , Ag 1+ , Sr 2+ , Na 1+ , Bi 3+ , La 3+ , Ca 2+ , Ce 3+ , Cd 2+ , Pr 3+ , Sm 3+ , Eu 3+ , Gd 3+ , Th 4+ , Tb 3+ , Mn 2+ , Li 1+ , Dy 3+ , U 4+ , Y 3+ , Fe 2+ , Ho 3+ , Ce 4+ , Co 2+ , Zn 2+ , Er 3+ , Tm 3+ , Yb 3+ , and/or Lu 3+ , and the cations B' b1 m1+ B" b2 m2+ . . . B m ' bm m .spsp.n + at least comprise titanium Ti 4+ and, optionally, one or more cations of the group consisting of Mn 2+ , Cr 2+ , In 3+ , V 2+ , Fe 2+ , Pb 4+ , Li 1+ , Zr 4+ , Co 2+ , Sc 3+ , Zn 2+ , Cu 2+ , U 6+ , Mg 2+ , Hf 4+ , Mo 3+ , Sn 4+ , Ni 2+ , Nb 4+ , Ti 3+ , W 4+ , Mo 4+ , Fe 3+ , Mn 3+ , V 3+ , Re 4+ , Ir 4+ , Ru 4+ , W 5+ , Ta 5+ , Cr 3+ , Ga 3+ , Co 3+ , Mo 5+ , Ni 3+ , Sb 5+ , W 6+ , Nb 5+ , Mo 6+ , Fe 4+ , Re 5+ , V 4+ , Te 6+ , V 5+ , Cu 3+ , Al 3+ , Mn 4+ , Ge 4+ , and/or Re 7+ and ▪ are cation vacancies, and a 1 +a 2 +. . . +a n+1 =1, 0.17<a n+1 <0.30, b 1 +b 2 +. . . +b n =1 and a 1 *n 1 +a 2 *n 2 +. . . +a n *n n +b 1 *m 1 +b 2 *m 2 + . . . +b m *m m =6, is an improved dielectric, ceramic material whose dielectric properties can be reliably reproduced and optimized for specific fields of application. A dielectric, ceramic composition comprising said substituted barium-neodymium-titanium-perovskite can suitably be used as the dielectric material in capacitors, for example NPO-capacitors, and microwave components, in particular dielectric resonators.

Inventors

• 👤 Heinz Kohler
• 👤 Dieter Mateika
• 👤 Sietse Oostra

Bibliographic Details