Crystallography of Directionally Solidified NiO-Y2O3 Eutectic

The crystallographic relations between the two phases of the eutectic in the system NiO-Y₂O₃ was studied by X-ray diffraction and scanning electron microscopy. The very small lattice mismatch found at the interface may account for the extremely regular eutectic structures which are observed.     

Crystallography of the Directionally Solidified NiO-CaO Eutectic

Crystallographic relations between the two solid solutions forming the eutectic of the system NiO-CaO were studied by X-ray diffraction and scanning electron microscopy. The ionic arrangement at the phase interface can be described by alternate (111) planes of metal and close-packed oxygen ions .