TY - JOUR
T1 - Site selectivity and bonding in the β-phase aluminides
T2 - Studies of RuAl, PdAl, and Pd and Ru dopants in NiAl
AU - Daniel, Million
AU - Balasubramanian, Mahalingam
PY - 2000
Y1 - 2000
N2 - We have determined the site selectivity of Ru and Pd dopants in β-phase NiAl. For both transition metal rich and poor compositions, the Ru or Pd dopant goes to the Ni sublattice. The local structural disorder introduced by Pd dopants is significantly greater for the Al-rich than for the TM-rich composition. We have also determined the temperature dependence of the x-ray absorption fine structure Debye-Waller term for Ru atoms in stoichiometric RuAl, Ru in NiAl, and Pd in NiAl. We find evidence for large local shear resistance for Ru dopants in NiAl relative to Pd dopants in NiAl. These results are discussed in terms of calculated elastic moduli and cohesive energies of PdAl and RuAl.
AB - We have determined the site selectivity of Ru and Pd dopants in β-phase NiAl. For both transition metal rich and poor compositions, the Ru or Pd dopant goes to the Ni sublattice. The local structural disorder introduced by Pd dopants is significantly greater for the Al-rich than for the TM-rich composition. We have also determined the temperature dependence of the x-ray absorption fine structure Debye-Waller term for Ru atoms in stoichiometric RuAl, Ru in NiAl, and Pd in NiAl. We find evidence for large local shear resistance for Ru dopants in NiAl relative to Pd dopants in NiAl. These results are discussed in terms of calculated elastic moduli and cohesive energies of PdAl and RuAl.
UR - http://www.scopus.com/inward/record.url?scp=0141902627&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.61.6637
DO - 10.1103/PhysRevB.61.6637
M3 - Article
AN - SCOPUS:0141902627
SN - 1098-0121
VL - 61
SP - 6637
EP - 6644
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 10
ER -