NH3*H2O in ammonia; water; nitric acid aq. HNO3; aq. NH3; addn. of calcite and 30percent nitric acid to 0.42 M aqueous soln. of phosphoric acid maintaining pH at 1, addn. of 5.3 M aqueous ammonia at 20°C at rate 1.3 ml/min; molar ratio Ca:P was 1.67; keeping for 24 h, isolation of precipitate, washing with hot distd. water, filtration, drying in air, drying at 150°C for 3 h, X-ray diffraction and IR;
in water Ca-salt dissoln. in boiling water, hot concd. NH4-salt soln. addn. dropwise to excess Ca-salt soln., pptn.; ppt. washing (water), drying with acetone;
参考文献
Journal of Solid State Chemistry, , vol. 23, p. 375 - 382
