A ceramic member includes a matrix phase of a perovskite compound including La, Ca, and Mn, and a heterophase including Mn and O as main components, wherein crystal grains of the perovskite compound have an average grain size of about 2.5 m or more and about 6.4 m or less.

A dielectric composition comprising a complex oxide represented by a general formula of A.sub.aB.sub.bC.sub.4O.sub.15+ and an oxide including aluminum, in which A at least includes Ba, B at least includes Zr, and C at least includes Nb, a is 2.50 or more and 3.50 or less, and b is 0.50 or more, and 1.50 or less.

A zirconia sintered body that includes a transparent zirconia portion and an opaque zirconia portion has a biaxial bending strength of 300 MPa or more. In addition, the opaque zirconia portion is configured by an opaque zirconia sintered body that is any one of a dark-colored zirconia sintered body, a medium-light-colored zirconia sintered body, and a light-colored zirconia sintered body.

Provided are a dielectric, a capacitor and a semiconductor device that include the dielectric, and a method of preparing the dielectric, the dielectric including: a composition represented by Formula 1; and an oxide including a perovskite type crystal structure having a polar space group or a non-polar space group other than a Pbnm space group:
A.sub.xB.sub.yO.sub.3-<Formula 1> wherein, in Formula 1, A is a monovalent, divalent, or trivalent cation, B is a trivalent, tetravalent, or pentavalent cation, and 0.5x1.5, 0.5y1.5, and 00.5.

The present invention provides a ferrite sintered magnet comprising ferrite crystal grains having a hexagonal structure, wherein the ferrite sintered magnet comprises metallic elements at an atomic ratio represented by formula (1). In formula (1), R is at least one element selected from the group consisting of Bi and rare-earth elements, and R comprises at least La. In formula (1), w, x, z and m satisfy formulae (2) to (5). The above-mentioned ferrite sintered magnet further has a coefficient of variation of a size of the crystal grains in a section parallel to a c axis of less than 45%.

Ca.sub.1-w-xR.sub.wSr.sub.xFe.sub.zCo.sub.m(1)

0.360w=0.420(2)

0.110x0.173(3)

8.51z9.71(4)

0.208m0.269(5)

A method for producing a ceramic complex includes: preparing a raw material mixture that contains 5% by mass or more and 40% by mass or less of first rare earth aluminate fluorescent material particles containing an activating element and a first rare earth element different from the activating element, 0.1% by mass or more and 32% by mass or less of oxide particles containing a second rare earth element, and the balance of aluminum oxide particles, relative to 100% by mass of the total amount of the first rare earth aluminate fluorescent material particles, the oxide particles, and the aluminum oxide particles; preparing a molded body of the raw material mixture; and obtaining a sintered body by calcining the molded body in a temperature range of 1,550 C. or higher and 1,800 C. or lower.

A plasma processing device member of the present disclosure is made of an yttrium oxide sintered body containing 98% by mass or more of yttrium oxide and having a plurality of open pores, in which when an average of the distances between centers of gravity of the open pores adjacent to each other is set to L1, L1 is 50 m or more. Additionally, a plasma processing device of the present disclosure includes the plasma processing device member and a plasma generator.

Provided are a method of manufacturing a ceramic article in which the improvement of mechanical strength, wear resistance, and machinability is achieved using a direct modeling system, and a ceramic article. The manufacturing method includes the steps of: (i) arranging powder containing ceramics as a main component on a base; (ii) irradiating a part or an entirety of the arranged powder with an energy beam to melt and solidify the powder, to thereby obtain an intermediate modeled article; (iii) causing the modeled article to absorb a metal component-containing liquid to impregnate the modeled article therewith; and (iv) subjecting the modeled article having absorbed the metal component-containing liquid to heat treatment.

The sintered body has an average particle size in the range of 0.1 m or more and 5 m or less, includes gamet-type oxide base material particles having at least Li, La, and Zr, has 8% by volume or more of voids, and has an ionic conductivity of 1.010.sup.5 S/cm or more at temperature of 25 C.

A cutting tool comprises a rake face and a flank face, the cutting tool being composed of a substrate made of a cubic boron nitride sintered material and a coating provided on the substrate, the coating including a MAIN layer, the MAIN layer including crystal grains of M.sub.xAl.sub.1-xN in the cubic crystal system, n.sub.F<n.sub.R being satisfied, where n.sub.F represents a number of voids per 100 m in length of the MAIN layer on the flank face in a cross section of the MAIN layer, and n.sub.R represents a number of voids per 100 m in length of the MAIN layer on the rake face in a cross section of the MAIN layer, n.sub.D being 3 or less, where n.sub.D represents a number of droplets per 100 m in length of the MAIN layer on the flank face in a cross section of the MAIN layer.