| 橄榄石成核动力学方程的修正及其对动力学数据的约束 |
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| 引用本文： | 王曙光,宁杰远.橄榄石成核动力学方程的修正及其对动力学数据的约束[J].地球物理学报,2011,54(9):2225-2232. |
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| 作者姓名： | 王曙光 宁杰远 |
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| 作者单位： | 1. 中国地震局地震预测研究所,北京 100036;
2. 北京大学地球与空间科学学院地球物理学系,北京 100871 |
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| 基金项目： | 国家自然科学基金(41004033),中国地震局地震预测研究所基本科研业务专项(02092413)和高校博士点基金(20100001110032)资助. |
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| 摘 要： | 本文从成核动力学理论出发,考虑新相晶核的表面能对其形状的影响,修正了晶面成核情形的成核动力学方程.新的成核率方程还原了传统成核率方程中通常简化为常数的指前系数.结合修正的相变体积分数计算公式,新的成核率方程可以确定出成核过程中的两个物理参量:新相晶粒与反应相晶粒的接触角度及新相物质与反应相物质之间的表面能.分析结果表明...
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| 关 键 词： | 俯冲带 深源地震 橄榄石 相变 成核率参数 |
| 收稿时间： | 2010-06-26 |
Modification of nucleation rate equation and its constraint on kinetic data |
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| WANG Shu-Guang,NING Jie-Yuan.Modification of nucleation rate equation and its constraint on kinetic data[J].Chinese Journal of Geophysics,2011,54(9):2225-2232. |
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| Authors: | WANG Shu-Guang NING Jie-Yuan |
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| Institution: | 1. Institute of Earthquake Science, China Earthquake Administration, Beijing 100036,China;
2. School of Earth and Space Sciences, Peking University, Beijing 100871, China |
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| Abstract: | The traditional incoherent grain boundary nucleation rate equation is modified to incorporate the effect of interfacial 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 interfacial 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 SiO4 kinetic data show that the contact angle and interfacial 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. |
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| Keywords: | Subduction zone Deep earthquake Olivine Phase transformation Nucleation parameter |
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