Abstract
Recently, a new family of MAX phases with in-plane chemical order, i-MAX, have been discovered which incorporate new elements expanding the family of MAX phases. i-MAX phases remain to be synthesized in single-phase bulk form for characterization. Herein, we show that by reactively hot pressing an intermetallic precursor, Y2.23Al, instead of elemental Y, in combination with excess overall Al and a sub-stoichiometric fraction of carbon, we enhance the yield of (Cr2/3Y1/3)2AlC to 85±3 wt% (86±3 mol%). Both the fractions of the impurity Y2O3 phase and the undesirable ternary Cr2AlC are reduced. Subsequent isothermal oxidation of (Cr2/3Y1/3)2AlC in natural air in the 1000–1400 °C temperature range reveals the formation of Y3Al2(AlO4)3 (YAG), Cr2O3 and Y2O3, without a continuous Cr7C3 sub-layer. Additionally, we show that by starting with Y2.23Al reagent we synthesize dense bulk (W2/3Y1/3)2AlC and (Mo2/3Y1/3)2AlC samples with enhanced i-MAX yields of 72±3 wt% (59±2 mol%) and 91±3 wt% (72±2 mol%), respectively. Oxidation of (Mo2/3Y1/3)2AlC at 1300 °C for 12 h leads to formation of a thick, porous oxide of Y2Mo3O12.
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