Ferro Corporation

Walter J Symes, Jr

Mike S H Chu

James M Wilson

Mohammed H Megherhi

Willibrordus J L M J Coppens

Elisabeth W J Römer

Srinivasan Sridharan

George E Sakoske

John J Maloney

Yie-Shein Her

Gregory R Prinzbach

Stanley Wang

Orville Washington Brown

George E Graddy, Jr

James E Henry

Electronic devices are produced from dielectric compositions comprising a mixture of precursor materials that, upon firing, forms a dielectric material comprising a barium-titanium-tungsten-silicon oxide.

High-K LTCC dielectric compositions and devices

LTCC devices are produced from dielectric compositions comprising a mixture of precursor materials that, upon firing, forms a dielectric material comprising a barium-tungsten-silicon host.

Low-K and mid-K LTCC dielectric compositions and devices

Electronic devices are produced from dielectric compositions comprising a mixture of precursor materials that, upon firing, forms a dielectric material comprising a barium-strontium-titanium-tungsten-silicon oxide.

LTCC devices are produced from dielectric compositions comprising a mixture of precursor materials that, upon firing, forms a dielectric material comprising a matrix of titanates of alkaline earth metals, the matrix doped with at least one selected from rare-earth element, aluminum oxide, silicon oxide and bismuth oxide.

Mid-K LTCC compositions and devices

Multilayer ceramic chip capacitors which satisfy COG requirements and which are compatible with reducing atmosphere sintering conditions so that non-noble metals such as nickel and nickel alloys thereof may be used for internal and external electrodes are made in accordance with the invention. The capacitors exhibit desirable dielectric properties (high capacitance, low dissipation factor, high insulation resistance), excellent performance on highly accelerated life testing, and very good resistance to dielectric breakdown. The dielectric layers comprise a barium strontium zirconate matrix doped with other metal oxides such as TiO, CaO, BO, and MgO in various combinations.

COG dielectric composition for use with nickel electrodes

Multilayer ceramic chip capacitors which satisfy COG requirements and which are compatible with reducing atmosphere sintering conditions so that non-noble metals such as nickel and nickel alloys may be used for internal and external electrodes are disclosed. The capacitors exhibit desirable dielectric properties (high capacitance, low dissipation factor, high insulation resistance), excellent performance on highly accelerated life testing, and very good resistance to dielectric breakdown. The dielectric layers comprise a strontium zirconate matrix doped with other metal oxides such as TiO, MgO, BO, CaO, MnO, Nd2O3 and Nb2O5 in various combinations.

Multilayer ceramic chip capacitors (MLCC's) which satisfy X7R TCC requirements and which are compatible with silver-palladium internal electrodes. The MLCC's exhibit desirable dielectric properties&#x2014;high capacitance, low dissipation factor, high insulation resistance, stable TCC&#x2014;and excellent performance on highly accelerated life testing, and good resistance to dielectric breakdown. The dielectric layers include a lead-free and cadmium-free barium titanate base material doped with other metal oxides such oxides of zinc, boron, bismuth, barium, titanium, praseodymium, cerium, tungsten, neodymium, tungsten, tin, niobium, copper, and/or manganese in various combinations. The dielectric ceramic materials herein can be fired at less than 1150&#xb0; C. with an inner electrode having 70 wt % or more Ag and 30 wt % or less Pd to form an MLCC.

Lead and cadmium free, low temperature fired X7R dielectric ceramic composition and method of making

Multilayer ceramic chip capacitors which satisfy COG requirements and which are compatible with reducing atmosphere sintering conditions so that non-noble metals such as nickel and nickel alloys thereof may be used for internal and external electrodes are made in accordance with the invention. The capacitors exhibit desirable dielectric properties (high capacitance, low dissipation factor, high insulation resistance), excellent performance on highly accelerated life testing, and very good resistance to dielectric breakdown. The dielectric layers comprise a strontium zirconate matrix doped with other metal oxides such as TiO, MgO, BO, CaO, AlO, SiO, and SrO in various combinations.

COG dieletric composition for use with nickel electrodes

Multilayer ceramic chip capacitors which satisfy X7R and BX requirements and which are compatible with silver-palladium internal electrodes are made in accordance with the invention. The capacitors exhibit desirable dielectric properties (high capacitance, low dissipation factor, high insulation resistance), excellent performance on highly accelerated life testing, and very good resistance to dielectric breakdown. The dielectric layers comprise a lead-free and cadmium-free barium titanate base material doped with other metal oxides such oxides of zinc, boron, bismuth, cerium, tungsten, copper, manganese, neodymium, niobium, silver, barium, silicon and nickel in various combinations. The dielectric ceramic materials herein can be sintered together (fired) at less than 1000&#xb0; C. with an inner electrode having more than 80 wt % Ag and less than 20 wt % Pd to form a multilayer ceramic capacitor (MLCC).

Ultra low temperature fixed X7R and BX dielectric ceramic composition and method of making

Multilayer ceramic chip capacitors which satisfy COG requirements and which are compatible with reducing atmosphere sintering conditions so that non-noble metals such as copper and copper alloys thereof may be used for internal and external electrodes are made in accordance with the invention. The capacitors exhibit desirable dielectric properties (high capacitance, low dissipation factor, high insulation resistance), excellent performance on highly accelerated life testing, and very good resistance to dielectric breakdown. The dielectric layers comprise a composite oxide formed by calcining rare earth titanates, barium titanate, together with other metal oxides such as MgO, CaO, ZnO, MnO, ZrO, SiO, GaO, NdO, NbO, and YO.

COG dielectric composition for use with copper electrodes

The present invention provides a new and improved method of making barium titanate powder. The method includes the steps of providing a solution comprising oxalic acid and titanium oxychloride, maintaining the solution at a predetermined temperature, adding barium carbonate to the solution thereby precipitating barium titanyl oxalate, and calcining the barium titanyl oxalate so as to provide the barium titanate powder.

Method of making barium titanate

A low temperature fired NPO type ceramic dielectric composition is employed for making high frequency multi-layer capacitors having dielectric constants between 25 and 40 at room temperature, and which do not vary from this base line value by more than .+-.30 parts per million (PPM)/.degree.C. over a temperature range of -55.degree. C. to +125.degree. C. with the value at +25.degree. C. being the reference point. The dielectric composition is made from a base dielectric ceramic formulation and a low melting point glass formulation, each derived from metal oxides or precursors thereof. Manganese dioxide or a precursor thereof may be added in the amount of from about 0.012 to 0.060 weight percent as the dioxide based on the combined weight of the ceramic formulation and the glass formulation. The mixtures, when made into multi-layer ceramic capacitors (MLCC), are fired at or below 1120.degree. C.

NPO dielectric ceramic compositions and capacitors made therefrom

Multi-layer ceramic capacitors are made from novel low temperature fired ceramic dielectric compositions which may have dielectric constants of over 3200 at room temperature, and which do not vary in value by more than 15 percent over a temperature range of -55.degree. C. to +125.degree. C., with the value at +25.degree. C. being the reference point. The compositions comprise a base ceramic formulation or host material, a ceramic sintering aid, and a low melting point glass formulation, each derived from metal oxides or precursors thereof. The host material is made from 97.89 to 98.19 weight percent barium titanate and from about 1.81 to 2.11 weight percent neodymium oxide, the sintering aid from Bi.sub.2 O.sub.3 .multidot.2TiO.sub.2, and the the glass formulation from 86.0 wt. % PbO, 9.0 wt. % B.sub.2 O.sub.3, 1.58 wt. % SiO.sub.2, 0.13 wt. % TiO.sub.2 and 3.29 wt. % Al.sub.2 O.sub.3. Manganese dioxide or a precursor is added in an amount of about 0.205 wt. % as the dioxide based on the combined weight of the ceramic formulation, the Bi.sub.2 O.sub.3 .multidot.2TiO.sub.2 and the glass formulation. The mixture, when made into a multi-layer capacitor is fired at or below 1100.degree. C.

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Dundee, NY, United States of America

Walter J Symes, Jr