Determination of Al occupancy and local structure for β-(AlxGa1− x) 2O3 alloys across nearly full composition range from Rietveld analysis
Al occupancy and local structure (bond lengths and bond angles) for monoclinic β-(Al x Ga
1− x) 2 O 3 alloys, with Al compositions (x) up to 90%, have been determined from Rietveld
refinement of x-ray diffraction data. An Al atom preferentially occupies an octahedron (O h)
atomic site in comparison with a tetrahedron (T d) atomic site. However, a sizable number of
T d atomic sites, ie, 20% for Al composition of 5%, remain occupied by Al atoms, which is
found to increase sharply with Al composition. The O h atomic sites are not fully occupied by …
1− x) 2 O 3 alloys, with Al compositions (x) up to 90%, have been determined from Rietveld
refinement of x-ray diffraction data. An Al atom preferentially occupies an octahedron (O h)
atomic site in comparison with a tetrahedron (T d) atomic site. However, a sizable number of
T d atomic sites, ie, 20% for Al composition of 5%, remain occupied by Al atoms, which is
found to increase sharply with Al composition. The O h atomic sites are not fully occupied by …