According to the principles of simultaneous equilibrium and electronic charge ne utrality,the thermodynamics of Sn（IV）-NH4+-Cl--H2O system under no rmal condition was calculated. Relation between all sorts of comple...According to the principles of simultaneous equilibrium and electronic charge ne utrality,the thermodynamics of Sn（IV）-NH4+-Cl--H2O system under no rmal condition was calculated. Relation between all sorts of complex of Sn4+ and pH was plotted. Based on thermodynamics analysis and calculation,some e xperiments were done to validate the relation between the total concentration of tin ion and pH in this system. The results suggest that the total concentration of ammonium and pH are the most important factors which determine whether （NH 4）2SnCl6 or （Sn（OH）4） exists in this system. Results further suggest whe n contnet of HCl is more than 6 mol/L,Sn4+ in this system will be also p recipitated in the form of （NH4）2SnCl6. These results lay the solid theory foundation to prepare pure （NH4）2SnCl6,a promising substitution for SnCl 4·5H2O to prepare antimony doped tin oxide（ATO） and indium tin oxide（ITO）,from the tinny material.展开更多
文摘According to the principles of simultaneous equilibrium and electronic charge ne utrality,the thermodynamics of Sn（IV）-NH4+-Cl--H2O system under no rmal condition was calculated. Relation between all sorts of complex of Sn4+ and pH was plotted. Based on thermodynamics analysis and calculation,some e xperiments were done to validate the relation between the total concentration of tin ion and pH in this system. The results suggest that the total concentration of ammonium and pH are the most important factors which determine whether （NH 4）2SnCl6 or （Sn（OH）4） exists in this system. Results further suggest whe n contnet of HCl is more than 6 mol/L,Sn4+ in this system will be also p recipitated in the form of （NH4）2SnCl6. These results lay the solid theory foundation to prepare pure （NH4）2SnCl6,a promising substitution for SnCl 4·5H2O to prepare antimony doped tin oxide（ATO） and indium tin oxide（ITO）,from the tinny material.
