Liquid lattice misfit

Because of the compositional differences, the lattice misfit and the coefficients of thermal expansion discrepancy between the core and shell, dislocation loops and networks formed at the interface and Ta SijX phases, Le. TajSiB, Ta gSijC j, precipitated from the liquid phase at the triple points leaving an amorphons film. The final appearance of the microstructure is the result of reaction 19, Table 3 for the matrix and of reactions 22,23, Table 3, for the triple points. 

Goldschmidt (1937, 1954) first recognized that the distribution of trace elements in minerals is strongly controlled by ionic radius and charge. The partition coefficient of a given trace element between solid and melt can be quantitatively described by the elastic strain this element causes by its presence in the crystal lattice. When this strain is large because of the magnimde of the misfit, the partition coefficient becomes small, and the element is partitioned into the liquid. This subject is treated in detail in Chapter 2.09. 

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