Electroconductive powder and method for production thereof

A method for producing an electroconductive powder which comprises adding an aqueous acidic solution in which a tin compound and a phosphorus compound are dissolved and an aqueous alkaline solution to an aqueous suspension of titanium dioxide in which the content of a metallic element having a valence of 4 or less contained in the titanium dioxide as an impurity is 0.02 or less as (B) obtained by the following formula (2)

• (B)=(M′1)×(4−n′1)×(M′2)×(4−n′2)+(M′3)×(4−n′3)+(M′4)×(4−n′4)+ . . . +(M′Y)×(4−n′Y) Formula (2):
• (in the above formula, M′1, M′2, M′3, M′4, . . . , M′Y represent an atomic ratio of each metallic element having a valence of 4 or less, the atomic ratio being to Ti of titanium dioxide, n′1, n′2, n′3, n′4, . . . , n′Y represent a valence number of each metallic element having the atomic ratio of M′1, M′2, M′3, M′4, . . . , M′Y, Y in M′Y and n′Y represents the number of the metallic element contained in the titanium dioxide and can have a natural number of 1 or more,
• with maintaining pH of the aqueous suspension in the range of 2-6 or 8-12, then fractionating the resulting product, and firing the product in an air or in an atmosphere of low oxygen concentration at a temperature of 600-925° C. to form an electroconductive layer containing tin oxide and phosphorus on the surface of the titanium dioxide.