抄録
Calcium chlorapatite single crystals were converted to hydroxyapatite single crystals by the hydrothermal treatments at 500°C for 12 h in a 6.25 M KOH solution. The mechanism of this topotaxial anion exchange is considered to be dissolution-precipitation of clusters. Calcium chlorapatite and hydroxyapatite single crystals were also converted to fluorapatite single crystals by the hydrothermal treatments at 500°C in a 5M KF solution but that of fluorapatite to hydroxyapatite proceeded by ordinary dissolution and precipitation of ions. The effects of metal ions in chlorapatite and the details of the reaction process were discussed.
