Journal
MATERIALS RESEARCH LETTERS
Volume 3, Issue 2, Pages 100-106Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/21663831.2014.975294
Keywords
Layered Ceramics; Neutron Diffraction; Thermal Expansion; MAX Phases
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Nanolamellar MAX phase compounds (Cr0.5V0.5)(n+1)AlCn are formed with n = 1, 2 and 3, and their 300 K structure is studied in detail by high-resolution neutron diffraction. While the n = 1 compound is found to have complete disordering of vanadium and chromium in the metallic layers, the n = 2 and 3 compounds show strong tendency for these elements' ordering, with the layer in the 2a(0,0,0) site of (Cr0.5V0.5)(3)AlC2 fully occupied by vanadium. The thermal expansion dependency of temperature is also studied by neutron diffraction for 2 < T < 550 K, revealing a negligible thermal expansion below 100 K for all of the compounds.
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