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  • 201.
    Zhang, Hualei
    et al.
    Xi An Jiao Tong Univ, Frontier Inst Sci & Technol, Ctr Microstruct Sci, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China.;Royal Inst Technol, Dept Mat Sci & Engn, Appl Mat Phys, SE-10044 Stockholm, Sweden..
    Lu, Song
    Royal Inst Technol, Dept Mat Sci & Engn, Appl Mat Phys, SE-10044 Stockholm, Sweden..
    Zhou, Minna
    Xi An Jiao Tong Univ, Frontier Inst Sci & Technol, Ctr Microstruct Sci, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China..
    Punkkinen, Marko P. J.
    Univ Turku, Dept Phys & Astron, FI-20014 Turku, Finland..
    Johansson, Borje
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Materialteori. Royal Inst Technol, Dept Mat Sci & Engn, Appl Mat Phys, SE-10044 Stockholm, Sweden..
    Vitos, Levente
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Materialteori. Royal Inst Technol, Dept Mat Sci & Engn, Appl Mat Phys, SE-10044 Stockholm, Sweden..
    Ab initio determination of the elastic properties of ferromagnetic body-centered cubic Fe-Mn-Al alloys2015Inngår i: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 118, nr 10, artikkel-id 103904Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The elastic properties of ferromagnetic Fe1-x-yMnyAlx (0 <= x <= 0.5, y = 0, 0.1, and 0.2) random solid solutions in the body-centered cubic (bcc) crystallographic phase have been investigated using the ab initio exact muffin-tin orbitals method in combination with the coherent-potential approximation. Comparison with the experimental data demonstrates that the employed theoretical approach accurately captures the observed composition dependence of the lattice parameter. The predicted elastic parameters follow complex composition dependence. The C-11, C-12, and C' = (C-11 - C-12)/2 single-crystal elastic constants, the bulk (B), shear (G), and Young's (E) moduli, and the Cauchy pressure (C-12 - C-44) mainly decrease with increasing Al content, whereas the Zener anisotropy ratio (C-44/C') strongly increases with x. C-44 exhibits a non-linear x dependence. The Poisson (v) and Pugh (B/G) ratios first decrease with x but show non-monotonous behavior in high-Al alloys. In terms of the Pugh criterion, these trends suggest an increased brittleness in Al-containing alloys. Manganese has a complex non-monotonous effect on B/G in low-Al alloys (below similar to 15 at. % Al) but enhances the brittleness of the bcc solid solution in large-Al regime. The peculiar Mn alloying effect is explained in terms of magneto-volume mechanisms.

  • 202.
    Zong, Zhao-Xiang
    et al.
    State Key Lab of ASIC & System, School of Microelectronics, Fudan Unviersity, Shanghai, China.
    Qiu, Zhi-Jun
    State Key Lab of ASIC & System, School of Microelectronics, Fudan Unviersity, Shanghai, China.
    Zhang, Shi-Li
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Fasta tillståndets elektronik.
    Streiter, Reinhard
    Center for Microtechnologies, Chemnitz University of Technology and Fraunhofer Research Insitution for Electronic Nano Systems, Chemnitz, Tyskland.
    Liu, Ran
    State Key Lab of ASIC & System, School of Microelectronics, Fudan Unviersity, Shanghai, China.
    A generalized 3 omega method for extraction of thermal conductivity in thin films2011Inngår i: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 109, nr 6, s. 063502-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    It has been found that in the low-frequency regime, the experimentally determined thermal conductivity of thin dielectric films deviates significantly from the theoretical expectation based on Cahill's 3 omega thermal model. It is shown in the present work that this deviation is mainly caused by the heat transport in the heater strip, which is neglected in Cahill's one-dimensional model. By taking this mechanism into account, an analytical model is developed to simultaneously consider the heat transport in the heater strip and the heat flow into the underlying substrate. The validity of this two-dimensional model is confirmed by experiments using specially designed test structures as well as by numerical simulation. The results show that the heat transport along the heater strip, originated from a nonuniform temperature, becomes comparable to that in the substrate at low frequencies. This effect of a nonuniform temperature distribution can also be exploited for extraction of the thermal conductivity of the metallic strip itself.

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