The synthetic process of some copper (II) phosphate compounds by the liquid method of CuSO
4 -Na
2HPO
4-H
2O system at 96°C were investigated. The composition of the precipitate changed with varying initial concentration ratio and stirring time.
The initial precipitate obtained by this method was Cu4 (HPO
4) (PO
4) 2·3H
2O including sodium phosphate, however Cu
3 (PO
4) 2·3H
2O reported by Hanawalt et al. did not produce from the above system. Further stirring of the precipitate in suspension at 96°C, the composition of the precipitate changed to Cu2 (PO
4) OH in case of initial concentration ratio R (Na
2HPO
4/CuSO
4 : molar ratio) =0.5-2.0, to 5NaCuPO
4·2Na
2HPO
4 (
Pe : 18.0%,
Y : 78.0%, λd : 488.9nm, pale greenish blue) in case of more than R=3.0, respectively. 5NaCuPO
4·2Na
2HPO
4 decomposed to α-NaCuPO
4 and Na
4P
2O
7 on heating at ca.500°C. Their morphologies of Cu
2 (PO
4) OH obtained by controlling synthetic conditions were spherical, pine needle-like, chestnut-like, rod-like and octahedral crystal. Cu
4 (PO
4)
2O obtained by heating Cu
2 (PO
4) OH is sufficiently applicable as inorganic pigment because of its vivid color (
Pe : 33.8%,
Y : 32.4%, λd : 554.9nm, brilliant yellow green).
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