I know basic definition of grain boundary and phase boundary. However, can we consider grain boundary as phase boundary as crystal orientation is different?
Dear Vishesh Dharaiya,
I can be wrong, but in my point of view in cases of polycrystalline ceramics grain boundary and phase boundary are almost equivalent definitions. Especially in nanoceramics.
I do not get the point. I think the difference is straingforward, at least if you have equilibrium. A grain boundary is the interface between two differently oriented crystals of the same phase and a phase boundary is the boundary between two phases. It may be stressed that without proper defintion of what equal orientations means, misorientation between two crystals of two different phases cannot be defined, whereas it is possible in the case of two crystals of the same phase separated by a grain boundary.
Dear Vishesh Dharaiya,
I think the reasonable answer and examples are here:
https://www.tf.uni-kiel.de/matwis/amat/iss/kap_5/backbone/r5_3_2.html
Grain boundary and phase boundary, both are different things. The grain boundary is an interface between two grains oriented in different directions such that dislocations could not propagate through this boundary. While phase boundary is interface where two structures exist on the both side of interface.e.g BaTiO3 is tetragonal on one side of and cubic on the other side, interface is called phase boundary.
No, because energy densities inside and outside the grain are the same.
But a similarity is that there is a non-zero surface energy density, and thus surface tension. The latter, however, will depend on coordinates due to lattice effects, so the grain will not tend to a spherical bubble.
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