U.S. Philips Corporation

Dieter W Mateika

Rolf Laurien

Jan Haisma

Erich Volkel

Gunter Bartels

Knuth Albertsen

Oliver Steigelmann

Petra Huppertz

Leonardus A Van Hoof

Johannes A Pistorius

Sietse Oostra

Heinz Kohler

Horst Laudan

A capacitor having a ceramic dielectric and at least two electrodes, the ceramic dielectric being predominantly composed of a dielectric, ceramic composition having a main component of BaTiO.sub.3 and/or �Ba.sub.1-y Sr.sub.y !Ti.sub.x O.sub.31 z, wherein 0.95.ltoreq.x.ltoreq.0.995, 0.ltoreq.y.ltoreq.0.04, z=2(1-x), and having at least an additive of the group formed by XMnO.sub.3, X.sub.2 MoO.sub.6, X.sub.2 WO.sub.6, X.sub.2 SiO.sub.5 +Mn.sub.2 SiO.sub.4 and Li.sub.2 SiO.sub.3 +Mn.sub.2 SiO.sub.4, and at least an additive of the group formed by Li.sub.2 SiO.sub.3, SiO.sub.2 and a mixture of 6 mol % Li.sub.2 O, 13 mol % BaO, 13 mol % SrO, 13 mol % MgO and 55 mol % SiO.sub.2, which is calcined at 800.degree. C., and, if necessary, an additive of the group formed by XInO.sub.3, XGaO.sub.3 and XAlO.sub.3, wherein X is one or more elements of the group formed by Y, Dy and Er, is characterized by a flat .DELTA.C/.DELTA.t curve and a stable dielectric behavior on exposure to temperature and voltage influences.

Multilayer capacitor comprising a dielectric of modified barium

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

Substituted barium-neodymium-titanium-perovskite, dielectric, ceramic

A method of growing mixed crystals having at least two lattice sites each having a different number of adjacent oxygen ions from melts of oxidic multi-component systems, homogeneous mixed crystals being grown such that the cations intended to occupy the first lattice site having the highest number of adjacent oxygen ions and to occupy the second lattice site having the next lowest number of adjacent oxygen ions are chosen such that the ratio of the bond length of the cations in the first lattice site to the bond length of the cations in the second lattice site is in the range from 0.7 to 1.5.

Mixed crystals of doped rare earth gallium garnet

A method of growing mixed crystals having two lattice sites, each of which having a different number of adjoining oxygen ions, from melts of oxidic multicomponent systems, homogeneous mixed crystals being grown in such a manner that the cations which are to populate the first lattice site having the largest number of adjoining oxygen ions and the cations which are to populate the second lattice site having the second largest number of adjoining oxygen ions are selected in such a manner that the ratio between the average ion radii of the cations on the first lattice site and the average ion radii of the cations on the second lattice site ranges from 2.2 to 2.5.

Method of growing mixed crystals from melts of oxidic multicomponent

A description is given of the composition and preparation of single phase crystals having a garnet structure and a lattice constant smaller than 11.9 .ANG.. The garnets correspond to the formula

Monocrystalline material having garnet structure

A cold crucible system and method for melting and crystallizing non-metallic inorganic compounds having a crucible, the side and the bottom of which are formed of metal pipes through which a cooling medium flows and independently excitable induction coils surrounding the side wall and the bottom of the crucible for coupling high energy into non-metallic inorganic compound present in said crucible and thus to melt said compound in said crucible, a member formed of an electrically conductive material and inert to any of said melt present in said crucible positioned at a distance above the bottom of the crucible and a container, opened at the top, lowered so as to project from the melt formed in the crucible, provided with apertures for the flow of the melt, and so positioned so as to contain up to 25% of the contents of the crucible.

Cold crucible system and method for the meeting and crystallization of

Magnetic device having a monocrystalline substrate bearing a magnetic layer, said substrate having a composition on the basis of rare earth metal gallium garnet of the general formula ##STR1## wherein A=gadolinium and/or samarium and/or neodym and/or yttrium

Magnetic device having a monocrystalline garnet substrate bearing a

With the fabrication of a substrate material in the form of alkaline-earth gallate single crystals it has become possible to grow monocrystalline barium hexaferrite layers of high quality. These thin barium hexaferrite layers on the alkaline-earth gallate substrates are extremely suited as magnetic devices because of their very high uniaxial anisotropy and their small line width. Such magnetic devices can be used for passive microwave components, e.g. as resonance isolators or filters in the centimeter wavelength range or as components in information storage technology, e.g. in magnetic cylindrical domain devices, especially in the field of very small (submicron) cylindrical domains.

Magnetic hexagonal ferrite layer on a nonmagnetic hexagonal mixed

A magnetic device has a monocrystalline garnet substrate bearing a magnetic layer, in particular for use as information storage. Magmetic device having a monocrystalline substrate bearing a magnetic layer, with the substrate having a composition on the basis of rare earth metal gallium garnet of the general formula ##STR1## wherein A=gadolinium and/or smarium and/or neodym and/or yttrium

With the fabrication of a substrate material in the form of alkaline-earth gallate single crystals it has become possible to grow monocrystalline barium hexaferrite layers of high quality. These thin barium hexaferrite layers on the alkaline-earth gallate substrates are extremely suited as magnetic devices because of their very high uniaxial anisotropy and their small line width. Such magnetic devices can be used for passive microwave components, e.g. as resonance isolators or filters in the centimeter wavelength range, or as components in information storage technology, e.g. in magnetic cylindrical domain devices, especially in the field of very small (submicron) cylindrical domains.

Growing community of inventors

Ellerbek, Germany

Dieter W Mateika