Journal of Materials Research

Articles

Self-propagating, high-temperature combustion synthesis of rhombohedral AlPt thin films

D.P. Adamsa1 c1, M.A. Rodrigueza1, C.P. Tiggesa1 and P.G. Kotulaa1

a1 Sandia National Laboratories, Albuquerque, New Mexico 87185

Abstract

Sputter-deposited, Al/Pt multilayer thin films of various designs exhibited rapid, self-propagating, high-temperature reactions. With reactant layers maintained at ∼21 °C prior to ignition and films adhered to oxide-passivated silicon substrates, the propagation speeds varied from approximately 20 to 90 m/s depending on bilayer dimension and total film thickness. Contrary to current Al–Pt equilibrium phase diagrams, all multilayers reacted in air and in vacuum transformed into rhombohedral AlPt having a space group R-3(148). Rietveld refinement of AlPt powder (generated from thin film samples) yielded trigonal/hexagonal unit cell lattice parameters of a = 15.634(3) Å and c = 5.308(1) Å; the number of formula units = 39. Rhombohedral AlPt was stable to 550 °C with transformation to a cubic FeSi-type structure occurring above this temperature.

(Received May 30 2006)

(Accepted August 24 2006)

(Online publication March 03 2011)

Key Words:

  • X-ray diffraction (XRD);
  • Combustion synthesis (SHS);
  • Crystallographic structure

Correspondence:

c1 Address all correspondence to this author. e-mail: dpadams@sandia.gov

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