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Low Temperature Synthesis and Characterization of AlScMo3O12

Department of Chemistry & Biochemistry, the University of Toledo, Toledo, OH 43606, USA
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Academic Editor: Jung Ho Je
Materials 2015, 8(2), 700-716; https://doi.org/10.3390/ma8020700
Received: 26 December 2014 / Revised: 13 January 2015 / Accepted: 10 February 2015 / Published: 16 February 2015
(This article belongs to the Section Structure Analysis and Characterization)
Recent interest in low and negative thermal expansion materials has led to significant research on compounds that exhibit this property, much of which has targeted the A2M3O12 family (A = trivalent cation, M = Mo, W). The expansion and phase transition behavior in this family can be tuned through the choice of the metals incorporated into the structure. An undesired phase transition to a monoclinic structure with large positive expansion can be suppressed in some solid solutions by substituting the A-site by a mixture of two cations. One such material, AlScMo3O12, was successfully synthesized using non-hydrolytic sol-gel chemistry. Depending on the reaction conditions, phase separation into Al2Mo3O12 and Sc2Mo3O12 or single-phase AlScMo3O12 could be obtained. Optimized conditions for the reproducible synthesis of stoichiometric, homogeneous AlScMo3O12 were established. High resolution synchrotron diffraction experiments were carried out to confirm whether samples were homogeneous and to estimate the Al:Sc ratio through Rietveld refinement and Vegard’s law. Single-phase samples were found to adopt the orthorhombic Sc2W3O12 structure at 100 to 460 K. In contrast to all previously-reported A2M3O12 compositions, AlScMo3O12 exhibited positive thermal expansion along all unit cell axes instead of contraction along one or two axes, with expansion coefficients (200–460 K) of αa = 1.7 × 10−6 K−1, αb = 6.2 × 10−6 K−1, αc = 2.9 × 10−6 K−1 and αV = 10.8 × 10−6 K−1, respectively. View Full-Text
Keywords: negative thermal expansion; A2M3O12; scandium aluminum molybdate; high resolution diffraction; non-hydrolytic sol-gel chemistry negative thermal expansion; A2M3O12; scandium aluminum molybdate; high resolution diffraction; non-hydrolytic sol-gel chemistry
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MDPI and ACS Style

Truitt, R.; Hermes, I.; Main, A.; Sendecki, A.; Lind, C. Low Temperature Synthesis and Characterization of AlScMo3O12. Materials 2015, 8, 700-716.

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