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Azimuthal Anisotropy of Rhombohedral (Corundum Phase) Heterostructures
Author(s) -
Grundmann Marius,
Lorenz Michael
Publication year - 2021
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.202100104
Subject(s) - corundum , trigonal crystal system , anisotropy , materials science , condensed matter physics , alloy , wurtzite crystal structure , crystallography , heterojunction , hexagonal crystal system , phase (matter) , chemistry , crystal structure , optics , metallurgy , physics , organic chemistry
The corundum structure is rhombohedral/trigonal and thus has lower symmetry than the well‐investigated hexagonal crystals such as wurtzite GaN‐ and ZnO‐based materials. By investigating the growth of α‐phase( Al xGa 1 − x ) 2 O 3alloy thin films on various orientations of Al 2 O 3 substrates, the anisotropy around the [00.1]‐axis is investigated. In particular, the pseudomorphic growth on the r plane (01.2) and r ′ (10.2) plane substrates is compared. The findings agree with elasticity theory. Also, different growth kinetics are found on these two planes in terms of growth rate and preferential cation incorporation.