Single 4,7,12,15-tetrakis(4'-dimethylaminostyryl)[2.2]paracyclophane molecules adsorb on NiAl(110) in different configurations. When the symmetry axes of the molecules are properly oriented with respect to the surface lattice, three adsorbate states of different conductance can be reversibly induced and directly imaged with a scanning tunneling microscope. Couplings between tunneling electrons ...

Finding prospective high temperature materials for use in advanced coal-fired plants has proven to be an extreme materials challenge. We propose a new methodlogy to predict alloys with high melting temperatures by estimating their formation enthalpies. The Miedema’s approach has been extended to ternary systems using an energy minimization scheme. The power of this approach is demonstrated by c...

Facile nucleation and growth of bilayer Ag(110) islands on NiAl(110) is observed by STM for Ag deposition at temperatures as low as 127 K. Density functional theory analysis for supported Ag films determines adatom adsorption energies (which favor bilayer islands), interaction energies, and diffusion barriers. Analysis of an atomistic lattice-gas model incorporating these energies elucidates th...

The importance of substrate-mediated adsorbate-adsorbate interactions on electronic states has been demonstrated for Au dimers on NiAl(110) with a scanning tunneling microscope and density functional calculations. An unoccupied resonance observed in single Au atoms splits into a doublet in Au dimers. The energy splitting depends inversely on the distance between the two adatoms, revealing the r...

Recently, Heusler ferromagnets have been found to exhibit unconventional anomalous electric, thermal, and thermoelectric transport properties. In this study, we employed first-principles density functional theory calculations systematically investigate both intrinsic extrinsic contributions the Hall effect (AHE), Nernst (ANE), thermal (ATHE) in two ferromagnets: Fe$_2$CoAl Fe$_2$NiAl. Our analy...

Batteries. In their Research Article (e202214880), Weibo Hua, Wei Tang, Sylvio Indris, Xiaodong Guo et al. synthesized a series of Ni-rich Li(NiAl)O2 oxides through tailoring the heating temperature. The with high cation disorder experience comparably homogeneous fatigue process upon extended cycling.

This paper presents the results of the continued development of creep-resistant, alumina-forming austenitic (AFA) stainless steel alloys, which exhibit a unique combination of excellent oxidation resistance via protective alumina (Al2O3) scale formation and high-temperature creep strength through the formation of stable nano-scale MC carbides and intermetallic precipitates. Efforts in fiscal ye...

ÐThe longitudinal primary creep of long-®ber composites is modeled by considering the transient stress states arising from load transfer from the weaker matrix phase to the stronger ®ber phase as the composite transitions from the elastic state present immediately after loading to steady-state stage where both phases creep. The e€ect of primary creep of each of the phases on the primary creep o...

Four Ni-Al intermetallic compounds with the Al concentrations in range of 28 to 35 (in atomic percentage) have been fabricated by laser metal deposition (LMD) through mixing appropriate contents pure Ni powder pre-alloyed high-Al nickel aluminide powder. Ni-35Al and Ni-32Al are both composed more than 45 vol.% β-NiAl matrix phase dispersing γ′-Ni3Al, while Ni-30Al Ni-28Al consisted worm-like, n...