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Constitutional defect structure of CuAl 2
Author(s) -
Zogg H.
Publication year - 1979
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889879011833
Subject(s) - crystallography , phase (matter) , materials science , bond length , chemistry , condensed matter physics , crystal structure , physics , organic chemistry
The equilibrium phase CuAl 2 contains a small excess of Al atoms at all temperatures. From accurate X‐ray and density measurements, it was found that the simplest defect structure model consistent with the experimental results is substitutional, Cu 1 − x Al 2 + x ( x = 0.005–0.022 at room temperature). Such a defect type appears to be very unfavourable energetically because of the short Cu‐Cu‐site bond length of CuAI 2 compared to other C 16 compounds, and would be in contrast to that of the other known C 16 compounds.