Modification of Nucleation Rate Equation and Its Constraint on Kinetic Data

详细信息   

• 责任者：Wang Shuguang (Institute of Earthquake Science ; China Earthquake Administration ; Beijing 100036 ; China) ; Ning Jieyuan
• 刊名：Chinese Journal of Geophysics
• 出版年：2011
• 卷期：54(9)
• 关键词：晶核形成 ; nucleation ; 橄榄石 ; olivine ; 动力学 ; dynamics
• 页码：p.2225-2232
• 图表：4 illus., 1 table, 24 refs.
• 分类号：0400
• 出版序号：1584
• issnNo：ISSN0001-5733
• isbnNo：CN11-2074/P

摘要

///The traditional incoherent grain boundary nucleation rate equation is modified to incorporate the effect of interracial energy on the shape of product nuclei. The modified equation recovers the pre-exponential factor to its original form, which is currently set as constant and determined by fitting to experimental data. Combined with the modified volume fraction calculation equation, the modified nucleation equation can refine two nucleation quantities, i. e. , contact angle and interracial energy between the reactant nuclei and product nuclei. Meanwhile the refinement can be employed to constrain the quality of experimental data. Further analyses of Ni₂SiO₄, Mg₂SiO₄, （Mg, Fe）2 SiO° kinetic data show that the contact angle and interracial energy of Ni₂SiO₄ are respectively 0. 57°, 32.33 J · m^-2, while the data quality of Mg₂SiO₄ and （Mg, Fe）₂SiO₄ is not good enough to extract such information. Both present study and the study on the effects of nucleation in heating and loading path suggest that the high quality experiments are needed to derive the correct nucleation parameters of mantle olivine.