各種二価金属含有ウィットロッカイトの液相合成

抄録

On the preparing process of Mg-containing synthetic whitlockite using a wet chemical method, synthesis of phosphate compounds having whitlockite structure replaced with Sr²⁺ ion or Ba²⁺ ion at Ca site and with other divalent metal ions at Mg site in the crystal was investigated.
As a result, whitlockite solid solutions (Mg- (Ca, Sr) W) replaced with Sr²⁺ ion at Ca site were produced in the pH regions from a neutral pH to a weak alkaline pH with mixed solution of Ca²⁺ and Sr²⁺ ions. However, synthetic barium whitlockite (Mg-BaW) and the whitlockite solid solutions (Mg (Ca, Ba) W) replaced with Ba²⁺ ion at Ca site were not produced with mixed solution of Ca²⁺ and Ba²⁺ ions. On the other hands, strontium whitlockite solid solutions (Mg- (Sr Ba) W) replaced with Ba²⁺ ion up to 90 mole% at Sr site were produced in pH regions from a weak alkaline pH to a high alkaline pH with mixed solution of Sr²⁺ and Ba²⁺ ions. Further, strontium synthetic whitlockite (SrW) contained Ni²⁺ ion, Co²⁺ ion, Fe²⁺ ion, Mn²⁺ ion, Zn²⁺ion or Cd²⁺ ion at Mg site was produced. Synthetic whitlockite prepared in this works defected metal ion at Ca site, was a nonstoichiometric composition.