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

摘要

A substituted barium-neodymium-titanium-perovskite which has a defect structure and which has the following general composition:P P[A'.sub.al.sup.ml+ A".sub.a2.sup.n2+ . . . A.sup.n '.sub.an.sup. n. spsp.n.sup.+ ▪.sub.an+1 ] [B'.sub.b1.sup.m1+ B".sub.b2.sup.m2 + . . . B.sup.m '.sub.bm.sup.m.spsp.n.sup.+] O.sub.3,PP wherein the cations A'.sub.a1.sup.n1+ A".sub.a2.sup.n2+ . . . A.sup.n '. sub.an.sup.n.spsp.n.sup.+ at least comprise Ba.sup.2+, Nd.sup.3+ and, optionally, one or more cations of the group consisting of Cs.sup.1+, Rb. sup.1+, Tl.sup.1+, K.sup.1+, Pb.sup.2+, Ag.sup.1+, Sr.sup.2+, Na.sup.1+, Bi.sup.3+, La.sup.3+, Ca.sup.2+, Ce.sup.3+, Cd.sup.2+, Pr.sup.3+, Sm.sup. 3+, Eu.sup.3+, Gd.sup.3+, Th.sup.4+, Tb.sup.3+, Mn.sup.2+, Li.sup.1+, Dy. sup.3+, U.sup.4+, Y.sup.3+, Fe.sup.2+, Ho.sup.3+, Ce.sup.4+, Co.sup.2+, Zn.sup.2+, Er.sup.3+, Tm.sup.3+, Yb.sup.3+, and/or Lu.sup.3+, and the cations B'.sub.b1.sup.m1+ B".sub.b2.sup.m2+ . . . B.sup.m '.sub.bm.sup.m. spsp.n.sup.+ at least comprise titanium Ti.sup.4+ and, optionally, one or more cations of the group consisting of Mn.sup.2+, Cr.sup.2+, In.sup.3+, V.sup.2+, Fe.sup.2+, Pb.sup.4+, Li.sup.1+, Zr.sup.4+, Co.sup.2+, Sc.sup.3+ , Zn.sup.2+, Cu.sup.2+, U.sup.6+, Mg.sup.2+, Hf.sup.4+, Mo.sup.3+, Sn. sup. 4+, Ni.sup.2+, Nb.sup.4+, Ti.sup.3+, W.sup.4+, Mo.sup.4+, Fe.sup.3+, Mn. sup.3+, V.sup.3+, Re.sup.4+, Ir.sup.4+, Ru.sup.4+, W.sup.5+, Ta.sup.5+ , Cr.sup.3+, Ga.sup.3+, Co.sup.3+, Mo.sup.5+, Ni.sup.3+, Sb.sup.5+, W.sup. 6+ , Nb.sup.5+, Mo.sup.6+, Fe.sup.4+, Re.sup.5+, V.sup.4+, Te.sup.6+, V. sup. 5+, Cu.sup.3+, Al.sup.3+, Mn.sup.4+, Ge.sup.4+, and/or Re.sup.7+ and .box- solid. are cation vacancies, andPPa.sub.1 +a.sub.2 + . . . +a.sub.n+1 =1,PP0.17 a.sub.n+1 0.30, P Pb.sub.1 +b.sub.2 +. . . +b.sub.n =1 andPPa. sub.1 *n.sup.1 +a.sub.2 *n.sup.2 +. . . +a.sub.n *n.sup.n +b.sub.1 *m.sup. 1 +b. sub.2 *m.sup.2 + . . . +b .sub.m *m.sup.m =6,PPis 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.