Kinetics of Precipitation of Non-ideal Binary Solid-solutions in an Aqueous Medium

详细信息    查看全文

• 作者：Claudine Noguera^a ; ^{claudine.noguera@insp.jussieu.fr} ; Bertrand Fritz^b ; Alain Clé ; ment^b
• 关键词：Nucleation and growth ; kinetic simulations ; non-ideal solid-solutions ; miscibility gap ; core-shell nanoparticles ; Nanokin code
• 刊名：Procedia Earth and Planetary Science
• 出版年：2017
• 出版时间：2017
• 年：2017
• 卷：17
• 期：Complete
• 页码：169-172
• 全文大小：182 K
• 卷排序：17

文摘

We have developed a formalism which accounts for the kinetics of precipitation of binary non-ideal solid-solutions, and includes nucleation, growth and/or re-dissolution processes. It allows prediction of the time evolution of the aqueous ion activities together with all characteristics of the solid phase: crystal size distribution function and composition profiles of particles. We show that different scenarios of precipitation are possible depending on the thermodynamic properties of the solid solution end-members, the degree of non-ideality of the solid solution and the initial conditions of precipitation. We illustrate the various scenarios by simulations performed under a few simplifying assumptions for some carbonate solid solutions of geochemical interest. To our knowledge, this is the first time in the field of geochemistry that these out-of-equilibrium precipitation processes of non-ideal solid solutions are fully described.