TITLE

Strain effects in group-III nitrides: Deformation potentials for AlN, GaN, and InN

AUTHOR(S)
Qimin Yan; Rinke, Patrick; Scheffler, Matthias; van de Walle, Chris G.
PUB. DATE
September 2009
SOURCE
Applied Physics Letters;9/21/2009, Vol. 95 Issue 12, p121111
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A systematic density functional theory study of strain effects on the electronic band structure of the group-III nitrides (AlN, GaN, and InN) is presented. To overcome the deficiencies of the local-density and generalized gradient approximations the Heyd–Scuseria–Ernzerhof (HSE) hybrid functional is used. Cross checks for GaN demonstrate good agreement between HSE and exact-exchange based G0W0 calculations. We observe a pronounced nonlinear dependence of band-energy differences on strain. For realistic strain conditions in the linear regime around the experimental equilibrium volume a consistent and complete set of deformation potentials is derived.
ACCESSION #
44374739

 

Related Articles

  • A Device for the Study of the Surface Tension of Liquid Metal Solutions with an Increased Elasticity of Intrinsic Vapors. Alchagirov, A. B.; Alchagirov, B. B.; Khokonov, Kh. B. // Instruments & Experimental Techniques;May/Jun2003, Vol. 46 Issue 3, p413 

    This device makes it possible to determine the temperature and concentration dependencies of the surface tension of liquid metal solutions from the change in the shape of a lying (sessile) drop. In particular, the device is used to study amalgams of refractory metals, one of whose components...

  • Inversion Procedure for Eddy Current Profiling of the Near-Surface Residual Stress in Shot-Peened Metals. Yu, F.; Nagy, P. B. // AIP Conference Proceedings;2005, Vol. 760 Issue 1, p1355 

    Because of their frequency-dependent penetration depth, eddy current measurements are capable of mapping the near-surface depth profile of the electrical conductivity. This technique can be used to nondestructively characterize the subsurface residual stress distribution in certain types of...

  • Creep effects on early damage initiation in a TBC system. Ali, M.Y.; Nusier, S.Q.; Newaz, G.M. // Journal of Materials Science;May2004, Vol. 39 Issue 10, p3383 

    High temperature superalloys coated with thermal barrier coating (TBC) may induce creep effects in different layers such as in the bond coat and the thermally grown oxide (TGO) layer. The effects of creep deformation in these layers were investigated on the magnitude of residual stresses in...

  • Influence of thermo-mechanical treatment on the precipitation strengthening behavior of Inconel 740, a Ni-based superalloy. Jun-Hak Oh; Byung-Gil Yoo; In-Chul Choi; Santella, Michael L.; Jae-il Jang // Journal of Materials Research;5/28/2011, Vol. 26 Issue 10, p1253 

    In this work, we have systematically explored the influence of thermo-mechanical treatment on the precipitation behavior and its strengthening in Inconel 740, a relatively new Ni-based superalloy, using specimens on which different levels of stresses were applied at 700 °C. With increasing...

  • Strain-Dependent Flow Stress Modeling of Hastelloy X Superalloy under Hot Compression. Horng-Yu Wu; Hsu-Cheng Liu; Feng-Jun Zhu; Chui-Hung Chiu // Advanced Materials Research;2014, Issue 912-914, p471 

    The compression deformation behavior and constitutive relation of Hastelloy X superalloy were investigated in the temperature range of 950 °C to 1150 °C and strain rate range of 0.001 s-1 to 1 s-1 on a Gleeble-3500 thermo-simulation machine. The obtained experimental stress-strain data...

  • Comparison of Mechanical Properties of TMW Alloys, New Generation of Cast-and-Wrought Superalloys for Disk Applications. Gu, Y.F.; Fukuda, T.; Cui, C.; Harada, H.; Mitsuhashi, A.; Yokokawa, T.; Fujioka, J.; Koizumi, Y.; Kobayashi, T. // Metallurgical & Materials Transactions. Part A;Dec2009, Vol. 40 Issue 13, p3047 

    A new kind of Ni-Co–base disk alloys, named TMW alloys, has been developed on the basis of our innovative concept. Full-scale pancakes (440 mm in diameter and 65 mm in thickness) with an average grain size of about 10 μm were successfully manufactured from TMW alloys by a conventional...

  • Computation-Based Analysis of the Methods of Hardening of Gears from Heat-Resistant Steels. Semenov, M.; Gavrilin, I.; Ryzhova, M. // Metal Science & Heat Treatment;May2014, Vol. 56 Issue 1/2, p45 

    A mathematical model is developed for estimating the contact fatigue of gears subjected to various kinds of thermochemical treatment. The model includes design of the contact stress state and of the loading capacity of the diffusion layer. The ranges of application of vacuum carburizing, vacuum...

  • Modeling of flow stress constitutive behavior of GH2984 superalloy for the prospective 700 °C fossil power plant. Jia, Peng; Wang, Engang; He, Jicheng // AIP Conference Proceedings;May2013, Vol. 1532 Issue 1, p427 

    Due to its excellent creep rupture strength and low cost, superalloy GH2984 has becoming a promising material to be used as heat exchanger in the prospective 700 °C fossil power plant. The mechanical response of the material under various forming conditions, which is a particularly important...

  • Mechanical properties of cold-rolled and aged MP35N alloys for cryogenic magnet applications. Toplosky, V. J.; Han, K. // AIP Conference Proceedings;6/12/2012, Vol. 1435 Issue 1, p125 

    MP35N is a Nickel-Cobalt based superalloy that currently has numerous applications at both room and elevated temperatures due to its ultra high strength, high modulus and outstanding corrosion resistance. The National High Magnetic Field Laboratory (NHMFL) further explored the use of MP35N in...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics