Abstract
A variety of possible hydrothermal solvents for AlPO 4, berlinite, were studied in an effort to find a solvent more efficacious than H 3PO 4. NaOH, Na 3PO 4 and NH 4HF 2 were shown to decompose AlPO 4 while the solubility in CH 3COOH, NaCl, and HNO 3 was negligible. However, the solubility in HCl was greater than in H 3PO 4 and AlPO 4 was the stable phase. Systematic solubility studies in HCl were conducted and it was found that the temperature dependence of solubility obeyed Van 't Hoff's law with δ H's of reaction comparable to those found for H 3PO 4. The solubility dependence on HCl concentration was used to suggest dissolving reactions and the pressure dependence was studied. Growth experiments in HCl were carried out and higher growth rates at comparable conditions and quality approximately comparable to H 3PO 4 were observed. Undesired wall and homogeneous nucleation was less than in H 3PO 4. It was concluded that HCl is a promising new solvent for AlPO 4 worthy of further investigation.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
