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通过在不同pH值,温度等条件下Ca5(AsO4)3OH的溶解,确定其稳定存在的pH值范围,得出它的溶度积和生成的自由能(ΔG0f)。结果表明,Ca5(AsO4)3OH在水中的溶解度和稳定范围与pH和温度有关,在酸性条件下(初始pH=2)它的溶解度较大,而且在水中的溶解度随着温度的升高而降低。利用PHREEQC程序计算确定Ca5(AsO4)3OH的溶度积为10-40.86,生成自由能ΔG0f为-5 063.53 kJ/mol。利用JADE5软件计算得到其晶格参数a=b=9.696,c=6.967和晶胞体积为567.304 3。
The solubility product of Ca5 (AsO4) 3OH and its free energy (ΔG0f) were obtained by determining the stable pH range of Ca5 (AsO4) 3OH under different pH and temperature conditions. The results show that the solubility and stability range of Ca5 (AsO4) 3OH in water are related to pH and temperature. Under acidic conditions (initial pH = 2), its solubility is larger and its solubility in water decreases with increasing temperature . Calculated using the PHREEQC program to determine the solubility product of Ca5 (AsO4) 3OH 10-40.86, the formation of free energy ΔG0f -5 063.53 kJ / mol. The lattice parameters a = b = 9.696, c = 6.967 and unit cell volume 567.304 3 were calculated by JADE5 software.