Abstract: Provided is a crystalline silicon carbide fiber containing silicon carbide, boron nitride, and zirconium carbide and having a content of Si of 64% by weight or more and a content of C of 28% by weight or more, in which the average particle size of SiC crystal grains is 100 nm or more.

Abstract: A crystalline silicon carbide fiber containing silicon carbide and boron nitride, the crystalline silicon carbide fiber having a content of Si of 64% to 72% by weight, a content of C of 28% to 35% by weight, and a content of B of 0.1% to 3.0% by weight, and including, at a surface portion, a composition gradient layer in which a content of silicon carbide increases while a content of boron nitride decreases toward a depth direction.

Abstract: An oxynitride phosphor powder has a fluorescence peak wavelength of 587 to 630 nm and a high external quantum efficiency. A method of producing the oxynitride phosphor powder containing Li at 50 to 10,000 ppm includes mixing silicon nitride powder, a substance serving as an aluminum source, a substance serving as a calcium source and a substance serving as an europium source; firing the mixture at 1500 to 2000° C. in an inert gas atmosphere or a reducing gas atmosphere to obtain a fired oxynitride phosphor composed mainly of Ca-containing ?-SiAlON, as an intermediate; and heat treating the fired oxynitride phosphor at a temperature of 1450° C. to less than the firing temperature, in an inert gas atmosphere or in a reducing gas atmosphere in the presence of Li.

Abstract: An (oxy)nitride phosphor powder has a fluorescence peak wavelength of 610 to 625 nm and also has higher external quantum efficiency than the conventional one. The (oxy)nitride phosphor powder includes an ?-type SiAlON and aluminum nitride, represented by the compositional formula: Cax1Eux2Si12?(y+z)Al(y+z)OzN16?z wherein x1, x2, y, z fulfill the following formulae: 1.60?x1+x2?2.90, 0.18?x2/x1?0.70, 4.0?y?6.5, 0.0?z?1.0. The powder can additionally contain Li in an amount of 50 to 10000 ppm. The content of the aluminum nitride may be more than 0 mass % to less than 33 mass %.

Abstract: An oxynitride phosphor powder is an ?-SiAlON phosphor having a dominant wavelength of 565-577 nm and fluorescence intensity and external quantum efficiency that are high enough for practical use. The oxynitride phosphor powder comprises an ?-SiAlON represented by the compositional formula: Cax1Eux2Ybx3Si12?(y+z)Al(y+z)OzN16?z (wherein 0.0<x1?2.0, 0.0000<x2?0.0100, 0.0000<x3?0.0100, 0.4?x2/x3?1.4, 1.0?y?4.0, 0.5?z?2.0).

Abstract: An oxynitride phosphor powder has a fluorescence peak wavelength of 587 to 630 nm and a high external quantum efficiency. A method of producing the oxynitride phosphor powder containing Li at 50 to 10,000 ppm includes mixing silicon nitride powder, a substance serving as an aluminum source, a substance serving as a calcium source and a substance serving as an europium source; firing the mixture at 1500 to 2000° C. in an inert gas atmosphere or a reducing gas atmosphere to obtain a fired oxynitride phosphor composed mainly of Ca-containing ?-SiAlON, as an intermediate; and heat treating the fired oxynitride phosphor at a temperature of 1450° C. to less than the firing temperature, in an inert gas atmosphere or in a reducing gas atmosphere in the presence of Li.

Abstract: An oxynitride phosphor powder is an ?-SiAlON phosphor having a dominant wavelength of 565-577 nm and fluorescence intensity and external quantum efficiency that are high enough for practical use. The oxynitride phosphor powder comprises an ?-SiAlON represented by the compositional formula: Cax1Eux2Ybx3Si12-(y+z)Al(y+z)OzN16-z (wherein 0.0<x1?2.0, 0.0000<x2?0.0100, 0.0000<x3?0.0100, 0.4?x2/x3?1.4, 1.0?y?4.0, 0.5?z?2.0).

Abstract: An oxynitride phosphor powder has a fluorescence peak wavelength of 610 to 625 nm and also has higher external quantum efficiency than the conventional one. The oxynitride phosphor powder includes an ?-type SiAlON and aluminum nitride, represented by the compositional formula: Cax1Eux2Si12?(y+z)Al(y+z)OzN16?z wherein x1, x2, y, z fulfill the following formulae: 1.60?x1+x2?2.90, 0.18?x2/x1?0.70, 4.0?y?6.5, 0.0?z?1.0. The powder can additionally contain Li in an amount of 50 to 10000 ppm. The content of the aluminum nitride may be more than 0 mass % to less than 33 mass %.

Abstract: A nitride phosphor includes a (Ca,Sr)AlSiN3:Eu phosphor, of which the chemical composition can be controlled easily and which has excellent fluorescent properties. A method produces a nitride phosphor represented by the formula: (Ca1-x1-x2Srx1Eux2)aAlbSicN2a/3+b+4/3c (wherein 0.49<x1<1.0, 0.0<x2<0.02, 0.9?a?1.1, 0.9?b?1.1, 0.9?c?1.1). In the method, a silicon nitride powder is used as a raw material, wherein the silicon nitride powder has a specific surface area of 5 to 35 m2/g and also has such a property that the FS/FSO ((m2/g)/(mass %)) ratio is 8 to 53 and the FS/FIO ((m2/g)/(mass %)) ratio is 20 or more.