Abstract: A magnetic base body according to one embodiment includes: a plurality of soft magnetic metal particles; and a plurality of insulating films covering surfaces of the plurality of soft magnetic metal particles. The plurality of soft magnetic metal particles include a first soft magnetic metal particle, and the plurality of insulating films include a first insulating film covering a surface of the first soft magnetic metal particle. The first insulating film includes one or more first oxide regions, the one or more first oxide regions containing Fe and Cr and having a peak intensity at 730 cm?1 in a Raman spectrum obtained by Raman spectrometry.

Abstract: One object is to manufacture a magnetic base body containing soft magnetic metal particles with a high content percentage of Fe. A manufacturing method of a magnetic base body according to one embodiment includes: producing a molded body containing a plurality of soft magnetic metal particles at a filling factor of 85% or higher, each of the plurality of soft magnetic metal particles containing Fe and an element A more apt to oxidation than Fe; and heating the molded body to form an insulating film on a surface of each of the plurality of soft magnetic metal particles, the insulating film containing an oxide of Fe and an oxide of the element A. A content percentage of Fe in the plurality of soft magnetic metal particles after the heating is higher than a content percentage of Fe in the plurality of soft magnetic metal particles before the heating.

Abstract: A coil component includes: a magnetic base body including a plurality of soft magnetic metal particles that contain Fe and Si, and an oxide film provided on the surface of each of the plurality of soft magnetic metal particles; and a coil conductor provided in the magnetic base body. The oxide film contains an oxide of Si and an oxide of element A (wherein the element A is at least one selected from the group consisting of Cr and Al). Each soft magnetic metal particle is divided into a central region and a surface region radially outward of the central region. The surface region contains a higher atomic proportion of Si than the central region. The soft magnetic metal particles include first soft magnetic metal particles that include Si—O precipitates separated from each other in the surface region.

Abstract: A dielectric substance includes a core-shell grain having a twin crystal structure. An interface of the twin crystal structure of the core-shell grain extends from a shell on one side, passes through a core, and extends to the shell on the other side.

Abstract: A multilayer ceramic capacitor (10) has a laminate body (20) constituted by dielectric layers (17) and internal electrode layers (18) stacked alternately. The dielectric layers (17) contain (Ba(1-x-y)CaxSry)m(Ti(1-z)Zrz)O3, where 0.03?x?0.16, 0?y?0.02, 0<z?0.02, 0.99?m?1.02, as a primary component, and an R oxide (R is a rare earth element) by 1.0 to 4.0 mol in equivalent element, an Mg compound by 0.2 to 2.5 mol in equivalent element, an Mn compound by 0.1 to 1.0 mol in equivalent element, a Zr compound by 0.1 to 2.0 mol in equivalent element, a V compound by 0.05 to 0.3 mol in equivalent element, and an Si compound by 0.2 to 5.0 mol in equivalent element, per 100 mol of the primary component. The multilayer ceramic capacitor can offer excellent DC bias properties and ensure high reliability.

Abstract: A ceramic electronic device includes a multilayer structure in which each of dielectric layers and each of internal electrode layers are alternately stacked, wherein a main component of the dielectric layers is (Ba, Sr, Ca)(Zr, Ti)O3, wherein a Ba concentration and a Ca concentration have variation in at least one of crystal grains in the dielectric layers.

Abstract: A dielectric substance includes a core-shell grain having a twin crystal structure. An interface of the twin crystal structure of the core-shell grain extends from a shell on one side, passes through a core, and extends to the shell on the other side.

Abstract: A ceramic electronic device includes a multilayer structure in which each of dielectric layers and each of internal electrode layers are alternately stacked, wherein a main component of the dielectric layers is (Ba, Sr, Ca)(Zr, Ti)O3, wherein a Ba concentration and a Ca concentration have variation in at least one of crystal grains in the dielectric layers.

Abstract: A multilayer ceramic capacitor (10) has a laminate body (20) constituted by dielectric layers (17) and internal electrode layers (18) stacked alternately. The dielectric layers (17) contain (Ba(1-x-y)CaxSry)m(Ti(1-z)Zrz)O3, where 0.03?x?0.16, 0?y?0.02, 0<z?0.02, 0.99?m?1.02, as a primary component, and an R oxide (R is a rare earth element) by 1.0 to 4.0 mol in equivalent element, an Mg compound by 0.2 to 2.5 mol in equivalent element, an Mn compound by 0.1 to 1.0 mol in equivalent element, a Zr compound by 0.1 to 2.0 mol in equivalent element, a V compound by 0.05 to 0.3 mol in equivalent element, and an Si compound by 0.2 to 5.0 mol in equivalent element, per 100 mol of the primary component. The multilayer ceramic capacitor can offer excellent DC bias properties and ensure high reliability.

Abstract: Provided is an alkali-niobate-based piezoelectric porcelain composition which has a crystal-structure transition point in the range of operation guarantee temperatures and which, despite this, is inhibited from abruptly changing in capacitance. The piezoelectric porcelain composition comprises Li, Na, K, Nb, Ta, Sb, and O as major constituent elements and has an alkali-niobate-based perovskite structure. When the composition has an ABO3 type perovskite structure as a unit lattice in which Z=1, the composition has a transition point at which the crystal structure changes from the monoclinic to the tetragonal system. Thus, the composition has a crystal-structure transition point at ?50° C. to 150° C. so as to utilize the high piezoelectric effect produced by the MPB at the crystal-structure transition point and, despite this, has the feature of always satisfying ?C>0.

Abstract: A dielectric ceramic composition includes sintered ceramic grains having a core-shell structure, wherein 50%˜80% of the grains have a domain width of twin smaller than 20 nm; not greater than 30% of the grains have a domain width of twin in the range from 20 nm to 50 nm; not smaller than 10% of the grains have a domain width of twin greater than 50 nm or have no twin.

Abstract: A dielectric ceramic composition includes sintered ceramic grains having a core-shell structure, wherein smaller than or equal to 50% of the grains have a domain width of twin less than 20 nm; 30% to 70% of the grains have a domain width of twin in the range from 20 nm to 50 nm; less than or equal to 50% of the grains have a domain width of twin greater than 50 nm or have no twin. A ceramic capacitor includes more than one internal electrode and one or more dielectric layers composed of a dielectric ceramic composition, each of the dielectric layers being sandwiched between two neighboring internal electrodes.

Abstract: A dielectric ceramic composition includes sintered ceramic grains having a core-shell structure, wherein 50% 80% of the grains have a domain width of twin smaller than 20 nm; not greater than 30% of the grains have a domain width of twin in the range from 20 nm to 50 nm; not smaller than 10% of the grains have a domain width of twin greater than 50 nm or have no twin.

Abstract: A dielectric ceramic composition includes sintered ceramic grains having a core-shell structure, wherein smaller than or equal to 50% of the grains have a domain width of twin less than 20 nm; 30% to 70% of the grains have a domain width of twin in the range from 20 nm to 50 nm; less than or equal to 50% of the grains have a domain width of twin greater than 50 nm or have no twin. A ceramic capacitor includes more than one internal electrode and one or more dielectric layers composed of a dielectric ceramic composition, each of the dielectric layers being sandwiched between two neighboring internal electrodes.