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High-Pressure Synthesis of Tantalum Nitride Having Orthorhombic U2S3Structure

Zerr, Andreas and Miehe, Gerhard and Li, Jinwang and Dzivenko, Dmytro A. and Bulatov, Vadim K. and Höfer, Heidi and Bolfan-Casanova, Nathalie and Fialin, Michel and Brey, Gerhard and Watanabe, Tomoaki and Yoshimura, Masahiro (2009):
High-Pressure Synthesis of Tantalum Nitride Having Orthorhombic U2S3Structure.
In: Advanced Functional Materials, Wiley VCH, Weinheim, Germany, pp. 2282-2288, 19, (14), ISSN 1616301X,
DOI: 10.1002/adfm.200801923,
[Online-Edition: https://doi.org/10.1002/adfm.200801923],
[Article]

Abstract

Among binary compounds, there is a high potential for discovery of novel members (polymorphic phases or compounds) of the nitrides of transition metals group due to a pronounced dependence of the oxidation state of the metals (M) on pressure. The power of high pressure–high temperature (HP‐HT) route for synthesis of binary nitrides has already been demonstrated by the discovery of cubic nitrides of the group 4 and 14 elements, of crystalline polymorphs of P3N5, and by reports on formation of four noble metal nitrides. It is anticipated that such HP products exhibit, in addition to enhanced elastic and mechanical behavior, other functional properties making them interesting for industrial applications. Here, HP–HT synthesis research is extended to nitrides of group 5 elements, resulting in the discovery of a novel hard tantalum nitride, exhibiting U2S3 structure: η‐Ta2N3 (Pbnm, a = 8.1911(17) Å, b = 8.1830(17) Å, c = 2.9823(3) Å). The stoichiometry is supported by two independent means, verifying that η‐Ta2N3 is the first thermodynamically stable transition metal nitride with a N:M ratio exceeding 4:3. Due to its high hardness and peculiar texture (needle‐like and granular crystallites), η‐Ta2N3 may find practical applications as a hard fracture resistant material.

Item Type: Article
Erschienen: 2009
Creators: Zerr, Andreas and Miehe, Gerhard and Li, Jinwang and Dzivenko, Dmytro A. and Bulatov, Vadim K. and Höfer, Heidi and Bolfan-Casanova, Nathalie and Fialin, Michel and Brey, Gerhard and Watanabe, Tomoaki and Yoshimura, Masahiro
Title: High-Pressure Synthesis of Tantalum Nitride Having Orthorhombic U2S3Structure
Language: English
Abstract:

Among binary compounds, there is a high potential for discovery of novel members (polymorphic phases or compounds) of the nitrides of transition metals group due to a pronounced dependence of the oxidation state of the metals (M) on pressure. The power of high pressure–high temperature (HP‐HT) route for synthesis of binary nitrides has already been demonstrated by the discovery of cubic nitrides of the group 4 and 14 elements, of crystalline polymorphs of P3N5, and by reports on formation of four noble metal nitrides. It is anticipated that such HP products exhibit, in addition to enhanced elastic and mechanical behavior, other functional properties making them interesting for industrial applications. Here, HP–HT synthesis research is extended to nitrides of group 5 elements, resulting in the discovery of a novel hard tantalum nitride, exhibiting U2S3 structure: η‐Ta2N3 (Pbnm, a = 8.1911(17) Å, b = 8.1830(17) Å, c = 2.9823(3) Å). The stoichiometry is supported by two independent means, verifying that η‐Ta2N3 is the first thermodynamically stable transition metal nitride with a N:M ratio exceeding 4:3. Due to its high hardness and peculiar texture (needle‐like and granular crystallites), η‐Ta2N3 may find practical applications as a hard fracture resistant material.

Journal or Publication Title: Advanced Functional Materials
Volume: 19
Number: 14
Publisher: Wiley VCH, Weinheim, Germany
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
11 Department of Materials and Earth Sciences > Material Science > Structure Research
Date Deposited: 19 Dec 2018 07:33
DOI: 10.1002/adfm.200801923
Official URL: https://doi.org/10.1002/adfm.200801923
Funders: This work was partially supported by the Materials and Structures Laboratory of the Tokyo Institute of Technology (Japan) in the framework of a Collaborative Research Project and by the ESRF (Grenoble, France)., The multi-anvil apparatus in Clermont-Ferrand is a French national facility supported by the INSU-CNRS.
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