U.S. Philips Corporation

Heinz Kohler

Dieter W Mateika

Sietse Oostra

A substituted barium-neodymium-titanium-perovskite which has a defect structure and which has the following general composition: [A'.sub.al.sup.ml+ A'.sub.a2.sup.n2+ . . . A.sup.n '.sub.an.sup.n.spsp.n.sup.+ .box-solid..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, 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, and

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Aachen, Germany

Heinz Kohler