Prediction and synthesis of a family of atomic laminate phases with Kagomé-like and in-plane chemical ordering.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 28776034.
- Also identified by DOI 10.1126/sciadv.1700642 and PMC identifier 5517111.
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Abstract
The enigma of MAX phases and their hybrids prevails. We probe transition metal (<i>M</i>) alloying in MAX phases for metal size, electronegativity, and electron configuration, and discover ordering in these MAX hybrids, namely, (V<sub>2/3</sub>Zr<sub>1/3</sub>)<sub>2</sub>AlC and (Mo<sub>2/3</sub>Y<sub>1/3</sub>)<sub>2</sub>AlC. Predictive theory and verifying materials synthesis, including a judicious choice of alloying M from groups III to VI and periods 4 and 5, indicate a potentially large family of thermodynamically stable phases, with Kagomé-like and in-plane chemical ordering, and with incorporation of elements previously not known for MAX phases, including the common Y. We propose the structure to be monoclinic <i>C</i>2/<i>c</i>. As an extension of the work, we suggest a matching set of novel MXenes, from selective etching of the A-element. The demonstrated structural design on simultaneous two-dimensional (2D) and 3D atomic levels expands the property tuning potential of functional materials.