Abstract: A silicon nitride powder having a specific surface area of 4.0 to 9.0 m2/g, a ? phase proportion of less than 40 mass %, and an oxygen content of 0.20 to 0.95 mass %, wherein a frequency distribution curve obtained by measuring a volume-based particle size distribution by a laser diffraction scattering method has two peaks, peak tops of the peaks are present respectively at 0.4 to 0.7 ?m and 1.5 to 3.0 ?m, a ratio of frequencies of the peak tops ((frequency of the peak top in a particle diameter range of 0.4 to 0.7 ?m)/(frequency of the peak top in a particle diameter range of 1.5 to 3.0 ?m)) is 0.5 to 1.5, and a ratio D50/DBET (?m/?m) of a median diameter D50 (?m) determined by the measurement of particle size distribution to a specific surface area-equivalent diameter DBET (?m) calculated from the specific surface area is 3.5 or more.

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 contains ?-SiAlON and aluminum nitride, obtained by mixing a silicon source, an aluminum source, a calcium source, and a europium source to produce a composition represented by a compositional formula: Cax1Eux2Si12?(y+z)Al(y+z)OzN16?z (wherein x1, x2, y and z are 0<x1?3.40, 0.05?x2?0.20, 4.0?y?7.0, and 0?z?1), and firing the mixture.

Abstract: A method of manufacturing a wavelength conversion member including a polycrystalline ceramics includes mixing a substance serving as a silicon source, a substance serving as an aluminum source, a substance serving as a calcium source, and a substance serving as a europium source; firing the obtained mixture to obtain an oxynitride phosphor powder; then sintering the oxynitride phosphor powder in an inert atmosphere to obtain the polycrystalline ceramics, characterized in that the sintered oxynitride phosphor powder has a composition (excluding oxygen) represented by the Formula: Cax1Eux2Si12-(y+z)Al(y+z)OzN16-z (in the Formula, x1, x2, y, and z are values such that 0<x1?3.40, 0.05?x2?0.20, 3.5?y?7.0, 0?z?1).

Abstract: A silicon nitride powder to be used in a slurry for forming a mold release layer of a polycrystalline silicon casting mold, wherein the specific surface area thereof is 5-50 m2/g, the proportion of amorphous silicon nitride is 1.0-25.0 mass %, and the oxygen content is 0.6-2.5 mass %. A silicon nitride powder slurry for use in mold release material and capable of forming, on a polycrystalline silicon casting mold, a mold release layer which exhibits favorable mold release properties and exhibits favorable adhesion to the casting mold after casting the polycrystalline silicon ingot, and a method for producing the same. A silicon nitride powder for mold release material, a silicon nitride powder for a slurry use for obtaining the silicon nitride powder slurry for use in the mold release material, and a method for producing the same. A polycrystalline silicon casting mold which exhibits favorable mold release properties of a polycrystalline silicon ingot; and method for producing the same.

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: A silicon nitride powder having a specific surface area of 4.0 to 9.0 m2/g, a ? phase proportion of less than 40 mass %, and an oxygen content of 0.20 to 0.95 mass %, wherein a frequency distribution curve obtained by measuring a volume-based particle size distribution by a laser diffraction scattering method has two peaks, peak tops of the peaks are present respectively at 0.4 to 0.7 ?m and 1.5 to 3.0 ?m, a ratio of frequencies of the peak tops ((frequency of the peak top in a particle diameter range of 0.4 to 0.7 ?m)/(frequency of the peak top in a particle diameter range of 1.5 to 3.0 ?m)) is 0.5 to 1.5, and a ratio D50/DBET (?m/?m) of a median diameter D50 (?m) determined by the measurement of particle size distribution to a specific surface area-equivalent diameter DBET (?m) calculated from the specific surface area is 3.5 or more.

Abstract: An oxynitride phosphor powder includes an ?-sialon fluorescent body having a fluorescent peak wavelength of 605-615 nm, and the external quantum efficiency of the oxynitride phosphor powder is greater than the conventional art. The oxynitride phosphor powder includes an ?-sialon represented by the formula Cax1Eux2Si12-(y+z)Al(y+z)OzN16-z (where x1, x2, y, and z satisfy the expressions 1.10?x1+x2?1.70, 0.18?x2/x1?0.47, and 2.6?y?3.6, 0.0?z?1.0).

Abstract: An oxynitride phosphor power has a fluorescence peak wavelength of 580 to 605 nm, the oxynitride phosphor having a higher external quantum efficiency than ever before. The oxynitride phosphor powder is an oxynitride phosphor powder containing ?-SiAlON and aluminum nitride, represented by composition formula: Cax1Eux2Si12?(y+z)Al(y+z)OzN16?z wherein x1, x2, y and z are 0<x1?2.50, 0.01?x2?0.20, 0<y?2.3 and 1.5?z?3.5, or x1, x2, y and z are 0<x1?2.70, 0.05?x2?0.20, 2.3?y?5.5 and 1?z?2.5.

Abstract: A silicon nitride powder for a release agent of a polycrystalline silicon ingot casting mold, having a specific surface area of 5 to 40 m2/g, wherein, assuming that a content ratio of oxygen present in a particle surface layer is FSO (mass %), a content ratio of oxygen present inside a particle is FIO (mass %), and the specific surface area is FS (m2/g), FS/FSO is 8 to 30 and FS/FIO is 22 or more, and a ratio D10/D90 between a 10 vol % diameter D10 and a 90 vol % diameter D90 in a measurement of a particle size distribution on a volume basis by a laser diffraction particle size distribution meter of 0.05 to 0.20.

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.

Abstract: A method of manufacturing a wavelength conversion member including a polycrystalline ceramics includes mixing a substance serving as a silicon source, a substance serving as an aluminum source, a substance serving as a calcium source, and a substance serving as a europium source; firing the obtained mixture to obtain an oxynitride phosphor powder; then sintering the oxynitride phosphor powder in an inert atmosphere to obtain the polycrystalline ceramics, characterized in that the sintered oxynitride phosphor powder has a composition (excluding oxygen) represented by the Formula: Cax1Eux2Si12-(y+z)Al(y+z)OzN16-z (in the Formula, x1, x2, y, and z are values such that 0<x1?3.40, 0.05?x2?0.20, 3.5?y?7.0, 0?z?1).

Abstract: A polycrystalline silicon ingot casting mold, and method for producing same. Mold release material being obtained by blending a silicon nitride powder (A) having an average particle diameter along the short axis of 0.6 to 13 ?m with a silicon nitride powder (B) having an average particle diameter along the short axis of 0.1 to 0.3 ?m at a weight ratio of 5:5 to 9:1; coating the mold surface with the slurry; and a heating the mold at 800 to 1200° C. in an atmosphere containing oxygen.

Abstract: Provided are a crystalline silicon nitride powder for a siliconitride phosphors, which is used as a starting material for producing a siliconitride phosphor containing a silicon element and a nitrogen element but no oxygen element as a constitutent element, an oxygen content of the silicon nitride phosphor being 0.2-0.8 wt %; a CaAlSiN3 phosphor, an Sr2Si5N8 phosphor, an (Sr, Ca)AlSiN3 phosphor and an La3Si6N11 phosphor, each using the silicon nitride powder; and a method for producing the phosphors.

Abstract: Provided is a silicon nitride powder for siliconitride phosphor having high luminance, a Sr3Al3Si13O2N21 phosphor and a ?-Sialon phosphor using the powder, which can be used for vacuum fluorescent displays (VFDs), field emission displays (FEDs), plasma display panels (PDPs), cathode ray tubes (CRTs), light emitting diodes (LEDs), or the like, and processes for producing these phosphors. The silicon nitride powder for the siliconitride phosphors is a crystalline silicon nitride powder for use as a raw material for producing siliconitride phosphors including a silicon element, a nitrogen element, and an oxygen element, and has an average particle diameter of 1.0 to 12 ?m and an oxygen content of 0.2 to 0.9% by weight.

Abstract: A method for producing an ?-sialon-based oxynitride phosphor includes a mixed powder blended such that the product is represented by the formula: MxSi12?(m+n)Al(m+n)OnN16?n:Lny (wherein M is at least one metal selected from Li, Ca, Mg, Y and a lanthanide metal excluding La and Ce, Ln is at least one lanthanide metal selected from Eu, Dy, Er, Tb and Yb), the mixed powder containing an amorphous silicon nitride powder having an loose bulk density of 0.16 to 0.22 g/cm3, and is fired at 1,400 to 2,000° C. in a nitrogen-containing inert gas atmosphere.