Dielectric and method for producing the same, and electrolytic capacitor

Abstract

There are provided a dielectric and an electrolytic capacitor that have a small amount of leakage current, and have high reliability also in a high temperature environment. A dielectric containing at least zirconium, titanium, and a carbon atom, wherein a concentration of the carbon atom is 100 ppm or more and 10,000 ppm or less, and an atomic ratio of the titanium to a sum of the zirconium and the titanium is 30% or more and 90% or less.

What is claimed is: 
     
         1 . A dielectric comprising at least zirconium, titanium, and a carbon atom, wherein
 a concentration of the carbon atom is 100 ppm or more and 10,000 ppm or less, and   an atomic ratio of the titanium to a sum of the zirconium and the titanium is 30% or more and 90% or less.   
     
     
         2 . A method for producing the dielectric according to  claim 1 , comprising:
 mixing an alloy of zirconium and titanium with an organic binder to obtain a mixture;   sintering the mixture to obtain a sintered body; and   anodizing the sintered body.   
     
     
         3 . The method for producing the dielectric according to  claim 2 , wherein the organic binder is at least one selected from the group consisting of an acrylic resin, a polyvinyl alcohol resin, a styrenic resin, and camphor. 
     
     
         4 . A method for producing the dielectric according to  claim 1 , comprising:
 heat-treating an alloy of zirconium and titanium in a gas comprising organic compound A; and   anodizing the alloy after the heat treatment.   
     
     
         5 . A method for producing the dielectric according to  claim 1 , comprising:
 anodizing an alloy of zirconium and titanium in a solution comprising organic compound B.   
     
     
         6 . A dielectric produced by the method according to  claim 2 . 
     
     
         7 . A dielectric produced by the method according to  claim 3 . 
     
     
         8 . A dielectric produced by the method according to  claim 4 . 
     
     
         9 . A dielectric produced by the method according to  claim 5 . 
     
     
         10 . An electrolytic capacitor comprising the dielectric according to  claim 1 . 
     
     
         11 . An electrolytic capacitor comprising the dielectric according to  claim 6 . 
     
     
         12 . An electrolytic capacitor comprising the dielectric according to  claim 7 . 
     
     
         13 . An electrolytic capacitor comprising the dielectric according to  claim 8 . 
     
     
         14 . An electrolytic capacitor comprising the dielectric according to  claim 9 .