Abstract: (1) A niobium monoxide powder for capacitors, which is represented by the formula: NbOx (x=0.8 to 1.2), may contain from 50 to 200,000 ppm of other element, and has a tapping density of 0.5 to 2.5 g/ml, an average particle size of 10 to 1,000 &mgr;m, an angle of repose of 10 to 60°, a BET specific surface area of 0.5 to 40 m2/g and a plurality of pore diameter peak tops in the pore distribution, and a production method thereof; (2) a niobium monoxide sintered body obtained by sintering the niobium monoxide powder, which has a plurality of pore diameter peak tops in the range from 0.01 to 500 &mgr;m, wherein preferably, out of the plurality of pore diameter peak tops, peak tops of two peaks having a highest relative intensity are present in the range from 0.2 to 0.7 &mgr;m and in the range from 0.

Abstract: A niobium hydride or niobium hydride alloy is ground at a temperature of −200 to 30° C. in the presence of a dispersion medium to obtain a niobium powder for capacitors, having a low oxygen content, the niobium powder for capacitors is granulated to obtain a niobium granulated product for capacitors, having an average particle size of 10 to 500 &mgr;m, the niobium powder or granulated powder for capacitors is sintered to obtain a sintered body, and a capacitor is fabricated by forming a dielectric material on the surface of the sintered body and providing another part electrode on the dielectric material, whereby a capacitor having good LC characteristics and less dispersed in the LC characteristics is obtained.

Abstract: The present invention discloses a decolorizable toner wherein a cationic dye having absorbance from the visible region to the near infrared region is contained in a binder resin together with a decolorant and anti-discoloration agent. In addition, the present invention also discloses a production process of a decolorizable toner that contains a step wherein cationic dye having absorbance from the visible region to the near infrared region, decolorant, binder resin and anti-discoloration agent are uniformly dissolved or dispersed in an organic solvent to prepare a mixed solution; a step wherein the solvent is removed from this mixed solution followed by drying; and, a step wherein the resulting dried mixture is pulverized to produce a toner.