PREPARATION OF SYNTHETIC WHITLOCKITE BY WET CHEMICAL METHOD

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Synthetic whitlockite was prepared by adding the solution in presence of Ca²⁺ ion and Mg²⁺ ion into the mixed solution of KOH (or NaOH) and H₃PO₄ at synthetic temperatures of 37~95°C. The synthetic Mg-containing whitlockite was formed in the pH regions from a weak acidic pH to a neutral pH. The composition of synthetic whitlockite contained a slight alkali metal ion of Na⁺ ion or K⁺ ion and water of crystallization of about 7%, and Ca-deficiency was replaced by H⁺ ion and Na⁺ ion or K⁺ ion in the whitlockite. Only when Mn²⁺, Fe²⁺, Co²⁺ or Ni²⁺ ion was used in the place of Mg²⁺ ion, further, the each bivalent metal-containing whitlockites were formed.