A developmental model of olivine morphology as a function of the cooling rate and the degree of undercooling
A developmental model of olivine morphology as a function of the cooling rate and the degree of undercooling
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DOI：
10.1007/s00410-003-0449-y
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发表时间：
2003-05-01
影响因子：
3.5
通讯作者：
Montel, JM
中科院分区：
文献类型：
--
作者：
Faure, F;Trolliard, G;Montel, JM
我们进行了动态结晶实验中的CMAS系统在1个大气压下的镁橄榄石晶体的形态的演变作为一个功能的冷却速度和过冷度。在平行于（010）平面的截面中，我们观察到镁橄榄石形态从片状到漏斗状（骨架）晶体，然后到燕尾形状（树枝状形态）的演变，以增加过冷度。文献中描述的其他形状可以被解释为这三种形状的特定部分。枝晶生长的开始是由于初始漏斗晶体的面的生长和枝晶过度生长之间的竞争。镁橄榄石枝晶是由一系列漏斗状单元组成的。这一结果已经通过另外一组实验进行了检验。
We performed dynamic crystallization experiments in the CMAS system at 1 atm to investigate the evolution of the morphology of forsterite crystals as a function of cooling rate and degree of undercooling. In sections parallel to the (010) plane, we observed the evolution of the forsterite morphology from tablets to hopper (skeletal) crystals, and then to swallowtail shapes (dendritic morphology) for increased degree of undercooling. The other shapes described in the literature can be interpreted as particular sections of those three shapes. The onset of dendritic growth is due to a competition between the growth of the faces of the initial hopper crystal and dendrite overgrowths. The forsterite dendrites are formed by a succession of units which look like hopper shapes. This result has been tested by an additional set of experiments.