Abstract
A porous glass‐ceramic in the CaO–TiO2—P2O5 system has been prepared by crystallization and subsequent chemical leaching of the corresponding glass. By applying a two‐step heat treatment to 45CaO · 25TiO2· 30P2O5 glasses containing a few mol% of Na2O, volume crystallization results in the formation of dense glass‐ceramics composed of CaTi4(PO4)6 and β‐Ca3(PO4)2 phases. By leaching the resultant glass ceramics with HCI, β‐Ca3(PO4)2 is selectively dissolved out, leaving a crystalline CaTi4(PO4)6 skeleton. The surface area and mean pore radius of the porous glass‐ceramics were approximately 40 m2/g and 13 nm, respectively.
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