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Epitaxial NaCl stru...
Epitaxial NaCl structure d-TaNx(001) : Electronic transport properties, elastic modulus, and hardness versus N/Ta ratio
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- Shin, C.-S. (författare)
- Materials Science Department, Frederick Seitz Mat. Res. Laboratory, University of Illinois, 104 South Goodwin Avenue, Urbana, IL 61801, United States
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- Gall, D. (författare)
- Materials Science Department, Frederick Seitz Mat. Res. Laboratory, University of Illinois, 104 South Goodwin Avenue, Urbana, IL 61801, United States
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- Kim, Y.-W. (författare)
- Materials Science Department, Frederick Seitz Mat. Res. Laboratory, University of Illinois, 104 South Goodwin Avenue, Urbana, IL 61801, United States
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- Desjardins, P. (författare)
- Materials Science Department, Frederick Seitz Mat. Res. Laboratory, University of Illinois, 104 South Goodwin Avenue, Urbana, IL 61801, United States
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- Petrov, I. (författare)
- Materials Science Department, Frederick Seitz Mat. Res. Laboratory, University of Illinois, 104 South Goodwin Avenue, Urbana, IL 61801, United States
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- Greene, J.E. (författare)
- Materials Science Department, Frederick Seitz Mat. Res. Laboratory, University of Illinois, 104 South Goodwin Avenue, Urbana, IL 61801, United States
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- Odén, Magnus (författare)
- Linköpings universitet,Tekniska högskolan,Nanostrukturerade material
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- Hultman, Lars (författare)
- Linköpings universitet,Tekniska högskolan,Tunnfilmsfysik
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Materials Science Department, Frederick Seitz Mat Res. Laboratory, University of Illinois, 104 South Goodwin Avenue, Urbana, IL 61801, United States Tekniska högskolan (creator_code:org_t)
- AIP Publishing, 2001
- 2001
- Engelska.
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Ingår i: Journal of Applied Physics. - : AIP Publishing. - 0021-8979 .- 1089-7550. ; 90:6, s. 2879-2885
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- While metastable Bl-NaCl-structure d-TaNx. is presently used in a variety of hard coating, wear-resistant, and diffusion barrier applications, it is a complex material exhibiting a wide single-phase field, x?0.94-1.37, and little is known about its fundamental properties. Here, we report physical properties of epitaxial d-TaNx. layers grown as a function of x on MgO(00) by ultrahigh vacuum reactive magnetron sputter deposition. The room-temperature resistivity (? = 225 µO cm), hardness (H = 30.9 GPa), and elastic modulus (E = 455 GPa) of d-TaNx(001) are independent of x over the range 0.94-1.22. However, changes in the electronic structure associated with increasing x>1.22 lead to an increase in ? with a decrease in H and E. All d-TaNx(001) layers exhibit negative temperature coefficients of resistivity between 20 and 400 K due to weak carrier localization. d-TaNx is superconducting with the highest critical temperature, 8.45 K, obtained for layers with the lowest N/Ta ratio, x=0.94. Based upon the above results, combined with the fact that the relaxed lattice constant a0 shows only a very weak dependence on x, we propose that the wide phase field in d-TaNx is due primarily to antisite substitutions of Ta on N (and N on Ta) sites, rather than to cation and anion vacancies. To first order, antisite substitutions in TaNx are isoelectronic and hence have little effect on charge carrier density. At sufficiently high N/Ta ratios, however, simple electron-counting arguments are no longer valid since large deviations from stoichiometry alter the character of the band structure itself. © 2001 American Institute of Physics.
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