Journal article
Enhanced yield synthesis of bulk dense (M2/3Y1/3)(2)AlC (M = Cr, W, Mo) in-plane chemically ordered quaternary atomically laminated i-MAX phases and oxidation of (Cr2/3Y1/3)(2)AlC and (Mo2/3Y1/3)2AlC
Journal of alloys and compounds, v 867
25 Jun 2021
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)(2)AlC 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)(2)AlC in natural air in the 1000-1400 degrees 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)(2)AlC and (Mo2/3Y1/3)(2)AlC 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)(2)AlC at 1300 degrees C for 12 h leads to formation of a thick, porous oxide of Y2Mo3O12. (C) 2021 Elsevier B.V. All rights reserved.
Metrics
Details
- Title
- Enhanced yield synthesis of bulk dense (M2/3Y1/3)(2)AlC (M = Cr, W, Mo) in-plane chemically ordered quaternary atomically laminated i-MAX phases and oxidation of (Cr2/3Y1/3)(2)AlC and (Mo2/3Y1/3)2AlC
- Creators
- Tarek Ali ElMelegy - Drexel UniversityMaxim Sokol - Tel Aviv UniversityMichel W. Barsoum - Drexel University
- Publication Details
- Journal of alloys and compounds, v 867
- Publisher
- Elsevier
- Number of pages
- 11
- Grant note
- DMR 1729350 / U.S. National Science Foundation; National Science Foundation (NSF)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000630276200030
- Scopus ID
- 2-s2.0-85100608007
- Other Identifier
- 991019169690604721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Chemistry, Physical
- Materials Science, Multidisciplinary
- Metallurgy & Metallurgical Engineering