POWDER, METHOD FOR PRODUCING POWDER AND ADSORPTION DEVICE

摘要

Disclosed is a powder which comprises particles of a compound represented by general formula (1): (Ca1-aMa)10(PO4)6((OH)1-bFb)2 (1) [wherein M represents a divalent metal element; a is from 0 (exclusive) to 1 (inclusive); and b is from 0 (inclusive) to 1 (inclusive)]. The powder is characterized in that said particles each comprises a surface, a center, a section in which the distance from the surface toward the center is 15 nm, and an area located between said section and the center, and the content of said divalent metal element in said area is equal to or greater than 3.2 wt%. When applied to an adsorbent packed in an adsorption device, the aforesaid powder shows an excellent durability and enables easy and sure separation and purification of a target compound.