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ZAIA

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A new potential class of nanolaminated and structurally complex materials,herein conceived as the Zigzag IntermetAllic (ZIA) phases, is proposed. A studyof the constituent phases of a specific Nb--Si--Ni intermetallic alloy revealedthat its ternary H-phase, \textit{i.e.}, the Nb$_3$SiNi$_2$ intermetalliccompound (IMC), is a crystalline solid with the close-packed \textit{fcc}Bravais lattice, the 312 MAX phase stoichiometry and a layered atomicarrangement that may define an entire class of nanolaminated IMCs analogous tothe nanolaminated ceramic compounds known today as the MAX phases. The electronmicroscopy investigation of the Nb$_{3}$SiNi$_{2}$ compound -- the firstcandidate ZIA phase -- revealed a remarkable structural complexity, as itsordered unit cell is made of 96 atoms. The ZIA phases extend the concept ofnanolaminated crystalline solids well beyond the MAX phases family of earlytransition metal carbides/nitrides, most likely broadening the spectrum ofachievable material properties into domains typically not covered by the MAXphases. Furthermore, this work uncovers that both families of nanolaminatedcrystalline solids, \textit{i.e.}, the herein introduced \textit{fcc} ZIAphases and all known variants of the \textit{hcp} MAX phases, obey the sameoverarching stoichiometric rule $P_{x+y}A_xN_y$, where $x$ and $y$ are integersranging from 1 to 6.

Transcending the MAX phases concept of nanolaminated early transition metal carbides/nitrides -- the ZIA phases