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Use of low temperature solvothermal reactions in the synthesis of nanocrystalline tantalum nitrides including nanorods

Use of low temperature solvothermal reactions in the synthesis of nanocrystalline tantalum nitrides including nanorods
Use of low temperature solvothermal reactions in the synthesis of nanocrystalline tantalum nitrides including nanorods
Solvothermal reactions of TaCl5 with LiNH2 or Mg3N2 lead to amorphous products at temperatures up to 500 °C. Post-reaction annealing under nitrogen yields crystalline products with Ta3N5 (LiNH2) and TaN (Mg3N2) structures. When these reactions are carried out with LiNH2 in refluxing mesitylene, rods of Ta3N5-structured material are obtained. Using commercial LiNH2 these have dimensions of 5 × 200 nm but are contaminated with LiTaO3. With high purity LiNH2 a black oxide-free but carbon-containing material presents as rods of 20–50 nm length. Higher temperature reactions in an autoclave lead to isotropic nanocrystals of ca. 10 nm diameter of a nitrogen-deficient or carbide-substituted Ta3N5-type material. Carbon incorporation is attributed to solvent decomposition at the temperatures required for the reactions. The TaN derived from reactions with Mg3N2 consists of nanoparticles of 6–8 nm in diameter.
1392-1398
Mazumder, Baishakhi
daa53102-8973-42f1-8f47-b1f41b9da89a
Hector, Andrew L.
f19a8f31-b37f-4474-b32a-b7cf05b9f0e5
Mazumder, Baishakhi
daa53102-8973-42f1-8f47-b1f41b9da89a
Hector, Andrew L.
f19a8f31-b37f-4474-b32a-b7cf05b9f0e5

Mazumder, Baishakhi and Hector, Andrew L. (2008) Use of low temperature solvothermal reactions in the synthesis of nanocrystalline tantalum nitrides including nanorods. Journal of Materials Chemistry, 18 (12), 1392-1398. (doi:10.1039/b717723b).

Record type: Article

Abstract

Solvothermal reactions of TaCl5 with LiNH2 or Mg3N2 lead to amorphous products at temperatures up to 500 °C. Post-reaction annealing under nitrogen yields crystalline products with Ta3N5 (LiNH2) and TaN (Mg3N2) structures. When these reactions are carried out with LiNH2 in refluxing mesitylene, rods of Ta3N5-structured material are obtained. Using commercial LiNH2 these have dimensions of 5 × 200 nm but are contaminated with LiTaO3. With high purity LiNH2 a black oxide-free but carbon-containing material presents as rods of 20–50 nm length. Higher temperature reactions in an autoclave lead to isotropic nanocrystals of ca. 10 nm diameter of a nitrogen-deficient or carbide-substituted Ta3N5-type material. Carbon incorporation is attributed to solvent decomposition at the temperatures required for the reactions. The TaN derived from reactions with Mg3N2 consists of nanoparticles of 6–8 nm in diameter.

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Published date: April 2008

Identifiers

Local EPrints ID: 145971
URI: http://eprints.soton.ac.uk/id/eprint/145971
PURE UUID: 84039060-6254-443f-925f-cf08ae8d135e
ORCID for Andrew L. Hector: ORCID iD orcid.org/0000-0002-9964-2163

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Date deposited: 20 Apr 2010 09:09
Last modified: 10 Dec 2019 01:54

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Author: Baishakhi Mazumder

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