Abstract: A crystal-oriented piezoelectric ceramic including a major constituent represented by general formula (1-s)A1B1O3-sBaMO3 (where A1 is at least one element selected from alkali metals, B1 is at least one of transition metal elements and includes Nb, M is at least one of Group IVA elements and includes Zr, and 0.05<s?0.15), the major constituent having a relative density of not less than 95.0% and not more than 98.5%.

Abstract: A method for manufacturing piezoelectric ceramic including the steps of: preparing a raw material so as to contain A, B, Ba and Zr as major constituents in a composition ratio represented by the following formula: (1-s)ABO3-sBaZrO3 (where A is at least one element selected from alkali metals, B is at least one of transition metal elements and includes Nb, 0.06<s?0.15); molding the raw material to obtain a molded body; sintering the molded body in a reducing atmosphere; and subjecting a sintered body obtained at the sintering step to a heat treatment in an oxidative atmosphere.

Abstract: A chip antenna comprising a magnetic substrate comprising Z-type ferrite or Y-type ferrite as a main phase and having a through-hole extending linearly along a center axis, and a conductor penetrating the through-hole, the magnetic phase having a c-axis substantially parallel or perpendicular to the through-hole.

Abstract: A chip antenna comprising a magnetic substrate comprising Z-type ferrite or Y-type ferrite as a main phase and having a through-hole extending linearly along a center axis, and a conductor penetrating the through-hole, the magnetic phase having a c-axis substantially parallel or perpendicular to the through-hole.

Abstract: In a coil component of the present invention, a coil member having a plurality of coil lines laminated through an insulating layer is sandwiched by hexagonal ferrite substrates, and the hexagonal ferrite substrate has anisotropy. To have the “anisotropy” means that alignment of the crystal orientation is different according to a direction of the substrate, in other words, that anisotropy is provided in the c-axis orientation of ferrite crystal grains of the hexagonal ferrite substrate. As the result of the “anisotropy”, an initial magnetic permeability is also different according to direction. By using the hexagonal ferrite substrate as a magnetic substrate to sandwich the coil member so as to form a magnetic path, the initial magnetic permeability can be maintained up to a high frequency, and a high-frequency characteristic of impedance generated by the coil lines can be improved.

Abstract: The ferrite sintered body of hexagonal Z-type ferrite contains 17 mol % to 21 mol % of BaO, 6 mol % to 13 mol % of CoO, the remainder being Fe2O3 as its main components and also contains 0.05% to 1.0% by mass of Li, based on the main components, in terms of Li2CO3 and 0.05% to 0.5% by mass of Si, based on the main components, in terms of SiO2. Further, the rate of a spinel-type ferrite phase to entire phases including a Z-type ferrite phase and the spinel-type ferrite phase is 5% or less in terms of an area ratio in the cross section of the sintered body.

Abstract: The ferrite sintered body of the present invention is a hexagonal Z-type ferrite sintered body having a high permeability and a low anisotropy of permeability, comprising a c-axis-oriented plane in which a degree of orientation fc? is not less than 0.4, said degree of orientation being given as fc?=?I(HK0)/?I(HKL), when I(HKL) is the integrated intensity of a diffraction peak represented by an index (HKL) in an X-ray diffraction pattern of which measurement range is 2?=20 to 80°, wherein the degree of orientation fc? calculated from fc?=I(0018)/I(110) in an X-ray diffraction is not less than 0.3 in at least two planes which are perpendicular to the aforementioned c-axis-oriented plane and are perpendicular to each other. Where ?I(HKL) is the sum of integrated intensity of all the diffraction peaks of hexagonal Z-type ferrite.

Abstract: The ferrite sintered body of hexagonal Z-type ferrite contains 17 mol % to 21 mol % of BaO, 6 mol % to 13 mol % of CoO, the remainder being Fe2O3 as its main components and also contains 0.05% to 1.0% by mass of Li, based on the main components, in terms of Li2CO3 and 0.05% to 0.5% by mass of Si, based on the main components, in terms of SiO2. Further, the rate of a spinel-type ferrite phase to entire phases including a Z-type ferrite phase and the spinel-type ferrite phase is 5% or less in terms of an area ratio in the cross section of the sintered body.