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Figure 2
Concentration triangles showing the approximate compositional stability ranges of most DQCs (top) and IQCs (bottom). Each of the elements listed in parentheses can be a constituent of a specific QC. For instance, Cd–(Ca,Yb) represents only the QCs in the binary systems Cd–Ca and Cd–Yb. RE means rare-earth elements. Extended compositional stability ranges reflect the existence of intrinsic substitutional disorder. Most QCs, however, have narrow compositional stability ranges, i.e. they are line compounds.

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ISSN: 2053-2733
Volume 74| Part 1| January 2018| Pages 1-11
https://doi.org/10.1107/S2053273317016540
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