Search: WFRF:(Schneider Daniel)
> (2020-2024) >
Valence electron co...
Valence electron concentration- and N vacancy-induced elasticity in cubic early transition metal nitrides
-
- Aghda, Soheil Karimi (author)
- Rhein Westfal TH Aachen, Mat Chem, Kopernikusstr 10, D-52074 Aachen, Germany.
-
- Bogdanovski, Dimitri (author)
- Rhein Westfal TH Aachen, Mat Chem, Kopernikusstr 10, D-52074 Aachen, Germany.
-
- Löfler, Lukas (author)
- Rhein Westfal TH Aachen, Mat Chem, Kopernikusstr 10, D-52074 Aachen, Germany
-
show more...
-
- Sua, Heng Han (author)
- Rhein Westfal TH Aachen, Mat Chem, Kopernikusstr 10, D-52074 Aachen, Germany.
-
- Patterer, Lena (author)
- Rhein Westfal TH Aachen, Mat Chem, Kopernikusstr 10, D-52074 Aachen, Germany.
-
- Holzapfel, Damian M. (author)
- Rhein Westfal TH Aachen, Mat Chem, Kopernikusstr 10, D-52074 Aachen, Germany.
-
- Le Febvrier, Arnaud (author)
- Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten
-
- Hans, Marcus (author)
- Rhein Westfal TH Aachen, Mat Chem, Kopernikusstr 10, D-52074 Aachen, Germany.
-
- Primetzhofer, Daniel (author)
- Uppsala universitet,Tillämpad kärnfysik,Uppsala Univ, Sweden
-
- Schneider, Jochen M. (author)
- Rhein Westfal TH Aachen, Mat Chem, Kopernikusstr 10, D-52074 Aachen, Germany.
-
Lo, Lukas (author)
-
show less...
-
Rhein Westfal TH Aachen, Mat Chem, Kopernikusstr 10, D-52074 Aachen, Germany Rhein Westfal TH Aachen, Mat Chem, Kopernikusstr 10, D-52074 Aachen, Germany (creator_code:org_t)
- Elsevier, 2023
- 2023
- English.
-
In: Acta Materialia. - : Elsevier. - 1359-6454 .- 1873-2453. ; 255
- Related links:
-
https://doi.org/10.1...
-
show more...
-
https://uu.diva-port... (primary) (Raw object)
-
https://liu.diva-por... (primary) (Raw object)
-
https://urn.kb.se/re...
-
https://doi.org/10.1...
-
https://urn.kb.se/re...
-
show less...
Abstract
Subject headings
Close
- Motivated by frequently reported deviations from stoichiometry in cubic transition metal nitride (TMNx) thin films, the effect of N-vacancy concentration on the elastic properties of cubic TiNx, ZrNx, VNx, NbNx, and MoNx (0.72 & LE; x & LE; 1.00) is systematically studied by density functional theory (DFT) calculations. The predictions are validated experimentally for VNx (0.77 & LE; x & LE; 0.97). The DFT results indicate that the elastic behavior of the TMNx depends on both the N-vacancy concentration and the valence electron concentration (VEC) of the transition metal: While TiNx and ZrNx exhibit vacancy-induced reductions in elastic modulus, VNx and NbNx show an increase. These trends can be rationalized by considering vacancy-induced changes in elastic anisotropy and bonding. While introduction of N-vacancies in TiNx results in a significant reduction of elastic modulus along all directions and a lower average bond strength of Ti-N, the vacancy-induced reduction in [001] direction of VNx is overcompensated by the higher stiffness along [011] and [111] directions, resulting in a higher average bond strength of V-N. To validate the predicted vacancy-induced changes in elasticity experimentally, close-to-singlecrystal VNx (0.77 & LE; x & LE; 0.97) are grown on MgO(001) substrates. As the N-content is reduced, the relaxed lattice parameter a0, as probed by X-ray diffraction, decreases from 4.128 & ANGS; to 4.096 & ANGS;. This reduction in lattice parameter is accompanied by an anomalous 11% increase in elastic modulus, as determined by nanoindentation. As the experimental data agree with the predictions, the elasticity enhancement in VNx upon N-vacancy formation can be understood based on the concomitant changes in elastic anisotropy and bonding.
Subject headings
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Annan materialteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Other Materials Engineering (hsv//eng)
Keyword
- TMN
- Elastic modulus
- Elastic anisotropy
- Point defects
- Vacancies
- Density functional theory
- Single crystal
- Thin films
Publication and Content Type
- ref (subject category)
- art (subject category)
Find in a library
To the university's database
- By the author/editor
-
Aghda, Soheil Ka ...
-
Bogdanovski, Dim ...
-
Löfler, Lukas
-
Sua, Heng Han
-
Patterer, Lena
-
Holzapfel, Damia ...
-
show more...
-
Le Febvrier, Arn ...
-
Hans, Marcus
-
Primetzhofer, Da ...
-
Schneider, Joche ...
-
Lo, Lukas
-
show less...
- About the subject
-
- NATURAL SCIENCES
-
NATURAL SCIENCES
-
and Physical Science ...
-
and Atom and Molecul ...
-
- ENGINEERING AND TECHNOLOGY
-
ENGINEERING AND ...
-
and Materials Engine ...
-
and Other Materials ...
- Articles in the publication
-
Acta Materialia
- By the university
-
Uppsala University
-
Linköping University