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Interface structure in superhard TiN-SiN nanolaminates and nanocomposites: film growth experiments and ab initio calculations
Department of Physics, Chemistry and Biology (IFM), Linköping University.
Frederick Seitz Materials Research Laboratory, Materials Science Department, University of Illinois at Urbana-Champaign.
Department of Physics, Chemistry and Biology (IFM), Linköping University.
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2007 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 75Article in journal (Refereed) Published
Abstract [en]

Nanostructured materials-the subject of much of contemporary materials research-are defined by internal interfaces, the nature of which is largely unknown. Yet, the interfaces determine the properties of nanocomposites and nanolaminates. An example is nanocomposites with extreme hardness70-90 GPa, which is of the order of, or higher than, diamond. The Ti-Si-N system, in particular, is attracting attention for the synthesis of such superhard materials. In this case, the nanocomposite structure consists of TiN nanocrystallites encapsulated in a fully percolated SiNx "tissue phase" (1 to 2 monolayers thick) that is assumed to be amorphous. Here, we show that the interfacial tissue phase can be crystalline, and even epitaxial with complex surface reconstructions. Using in situ structural analyses combined with ab initio calculations, we find that SiNx layers grow epitaxially, giving rise to strong interfacial bonding, on both TiN(001) and TiN(111) surfaces. In addition, TiN overlayers grow epitaxially on SiNx/TiN(001) bilayers in nanolaminate structures. These results provide insight into the development of design rules for new nanostructured materials.

Place, publisher, year, edition, pages
2007. Vol. 75
National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
URN: urn:nbn:se:ltu:diva-7057DOI: 10.1103/PhysRevB.75.155437ISI: 000246075300133Scopus ID: 2-s2.0-34247558037Local ID: 55f52090-968f-11dc-ad7f-000ea68e967bOAI: oai:DiVA.org:ltu-7057DiVA, id: diva2:979944
Note
Validerad; 2007; Bibliografisk uppgift: Paper id:: 155437; 20071119 (cira)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Söderberg, HansOdén, Magnus

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