Abstract: A polishing apparatus has a plurality of polishing stations for polishing materials to be polished and a plurality of cleaning stations for cleaning the materials being polished, the polishing stations and the cleaning stations being alternately arranged; and an arm for holding the materials being polished and transferring the materials being polished between the polishing stations and the cleaning stations successively. The arm includes a polishing head for holding the material being polished. Each of the cleaning stations comprises a retainer stand on which the material being polished is placed, and a cleaning device for cleaning the material being polished in a state held by the polishing head, cleaning the material being polished in a state placed on the retainer stand, and cleaning the polishing head in a state where the material being polished is separated from the polishing head.

Abstract: A composite ceramic material which is available by sintering a mixed powder of a dielectric material and a magnetic material, and contains a third component serving to inhibit a chemical reaction between the dielectric material and the magnetic material during sintering of the mixed powder and reduce the sintering temperature, and particularly, an EMI filter, a composite LC pan and a composite LC chip part made from such a composite ceramic material. The starting end and the terminal end of the inductor are exposed on the both end faces of the bare chip, and signal electrodes are provided at these ends. Ends of the conductors for grounding are exposed on the other both ends of the bare chip, and grounding electrodes are provided at these ends. The conductors for inductor are spirally connected in succession in the thickness direction of the bare chip via throughholes provided in the sheets within the bare chip to form an inductor.

Abstract: A manufacturing method for ceramic microspheres including the steps of; mixing an oil which is immiscible with an aqueous solution of a water-soluble metallic compound and which has a boiling point higher than that of water in the aqueous solution; applying ultrasonic vibration to the mixed solution to form a water-in-oil type emulsion; heating the emulsion at a temperature less than a boiling point of water to evaporate free water from droplets in which the water-soluble metallic compound is dissolved and to disperse spherical particles of the water-soluble metallic compound in the oil phase; and thereafter heating the dispersed solution at a temperature higher than the temperature at which the water-soluble metallic compound is decomposed to form a metallic oxide but lower than the temperature at which grain growth in the metallic oxide starts, to evaporate and decompose the oil and to remove the oil therefrom, thereby obtaining the metallic oxide microspheres.

Abstract: A ceramic composition represented by the following general formula:Pb.sub.1-x La.sub.x (Zr.sub.y Ti.sub.1-y).sub.1-x/4 O.sub.3wherein O<x<1, O<y<1) is produced by a method which comprises adding a mixed solution of a titanium alkoxide and a zirconium alkoxide to an aqueous solution containing lead nitrate and/or lead acetate and lanthanum nitrate and/or lanthanum acetate thereby simultaneously effecting hydrolysis of said alkoxides and coprecipitation of lanthanum components, further adding an alkaline substance to the resultant system thereby effecting substantially thorough precipitation of lead and lanthanum components, and heating the produced precipitate.

Abstract: A highly dielectric powder the chemical composition of which is represented by the following general formula:(Sr.sub.x Pb.sub.1-x TiO.sub.3).sub.y (PbMg.sub.0.5 W.sub.0.5 O.sub.3).sub.1-y(wherein 0.ltoreq.x<1 and 0<y<1) is produced by a method which comprises adding a mixture consisting of strontium alkoxide (which is not required when the subscript, x, in the aforementioned general formula is 0), lead alkoxide, titanium alkoxide, and magnesium alkoxide to an aqueous solution of ammonium para-tungstate thereby effecting hydrolysis of alkoxides and coprecipitation of a tungsten component and subsequently heating the resultant precipitate.

Abstract: A dielectric powder consisting of a solid solution of compounds selected at least one each from the two group (a) and (b) of compounds indicated below and having a chemical composition represented by the following general formula:[ABO.sub.3 ].sub.1-x [A'(B'.sub.1-y B".sub.Y)O.sub.3 ].sub.x (I)(Wherein x and y satisfy 0<x<1 and 0<y<1 respectively), is produced by mixing metal alkoxides in proportions such that the proportions of the metallic elements thereof conform to the proportions of the metallic elements in the aforementioned general formula (I) and hydrolyzing the metal alkoxides contained in the resultant mixture:(a) Compounds of the ABO.sub.3 type perovskite structure and(b) Compounds of the A'(B'.sub.1/2 B".sub.1/2)O.sub.3, A'(B'.sub.1/3 B".sub.2/3)O.sub.3, or A'(B'.sub.2/3 B".sub.1/3)O.sub.