Thermodynamics for chemical vapor synthesis of Nb nanopowder in NbCl5-H2-Ar system

Jun Zhu; Kai Huang; Jun Gang Hou; Hong Min Zhu

doi:10.1016/S1003-6326(14)63560-3

Thermodynamics for chemical vapor synthesis of Nb nanopowder in NbCl₅-H₂-Ar system

Jun Zhu, Kai Huang, Jun Gang Hou, Hong Min Zhu

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

Thermodynamics for chemical vapor synthesis (CVS) of Nb nanopowder in NbCl₅-H₂-Ar system was investigated by using FactSage software. The validation experiments were conducted to confirm the thermodynamics points. The results indicate that under the atmospheric pressure, the reduction approach from NbCl₅(g) to Nb(s) is a stage-wise process with the formation of complex sub-chlorides, and is controllable at low hydrogen ratio (mole ratio of n(NbCl₅):n(H₂)<1:180) and low temperature (<1050 °C). Furthermore, a reasonable amount of inert loading gas is favorable to increase the reduction ratio of NbCl₅ and the powder yield. The as-synthesized Nb nanopowder with the homogeneous size of 30-50 nm and the powder yield of 85% (mass fraction) is obtained by the CVS process under n(NbCl₅):n(H₂):n(Ar)=1:120:1 and 950 °C with the NbCl₅ reduction rate of 96.1%.

Original language	English
Pages (from-to)	3987-3993
Number of pages	7
Journal	Transactions of Nonferrous Metals Society of China (English Edition)
Volume	24
Issue number	12
DOIs	https://doi.org/10.1016/S1003-6326(14)63560-3
Publication status	Published - 2014 Dec 1
Externally published	Yes

Keywords

FactSage software
NbCl<inf>5</inf>-H<inf>2</inf>-Ar system
chemical vapor synthesis (CVS)
niobium nanopowder
thermodynamic

ASJC Scopus subject areas

Condensed Matter Physics
Geotechnical Engineering and Engineering Geology
Metals and Alloys
Materials Chemistry

Access to Document

10.1016/S1003-6326(14)63560-3

Cite this

@article{331cc94823e44b4e89492861ead611ca,

title = "Thermodynamics for chemical vapor synthesis of Nb nanopowder in NbCl5-H2-Ar system",

abstract = "Thermodynamics for chemical vapor synthesis (CVS) of Nb nanopowder in NbCl5-H2-Ar system was investigated by using FactSage software. The validation experiments were conducted to confirm the thermodynamics points. The results indicate that under the atmospheric pressure, the reduction approach from NbCl5(g) to Nb(s) is a stage-wise process with the formation of complex sub-chlorides, and is controllable at low hydrogen ratio (mole ratio of n(NbCl5):n(H2)<1:180) and low temperature (<1050 °C). Furthermore, a reasonable amount of inert loading gas is favorable to increase the reduction ratio of NbCl5 and the powder yield. The as-synthesized Nb nanopowder with the homogeneous size of 30-50 nm and the powder yield of 85% (mass fraction) is obtained by the CVS process under n(NbCl5):n(H2):n(Ar)=1:120:1 and 950 °C with the NbCl5 reduction rate of 96.1%.",

keywords = "FactSage software, NbCl<inf>5</inf>-H<inf>2</inf>-Ar system, chemical vapor synthesis (CVS), niobium nanopowder, thermodynamic",

author = "Jun Zhu and Kai Huang and Hou, {Jun Gang} and Zhu, {Hong Min}",

note = "Funding Information: Foundation item: Project (51102015) supported by the National Natural Science Foundation of China Corresponding author: Hong-min ZHU; Tel: +86-10-62334775; E-mail: hzhu@metall.ustb.edu.cn DOI: 10.1016/S1003-6326(14)63560-3 Publisher Copyright: {\textcopyright} 2014 The Nonferrous Metals Society of China.",

year = "2014",

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doi = "10.1016/S1003-6326(14)63560-3",

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TY - JOUR

T1 - Thermodynamics for chemical vapor synthesis of Nb nanopowder in NbCl5-H2-Ar system

AU - Zhu, Jun

AU - Huang, Kai

AU - Hou, Jun Gang

AU - Zhu, Hong Min

N1 - Funding Information: Foundation item: Project (51102015) supported by the National Natural Science Foundation of China Corresponding author: Hong-min ZHU; Tel: +86-10-62334775; E-mail: hzhu@metall.ustb.edu.cn DOI: 10.1016/S1003-6326(14)63560-3 Publisher Copyright: © 2014 The Nonferrous Metals Society of China.

PY - 2014/12/1

Y1 - 2014/12/1

N2 - Thermodynamics for chemical vapor synthesis (CVS) of Nb nanopowder in NbCl5-H2-Ar system was investigated by using FactSage software. The validation experiments were conducted to confirm the thermodynamics points. The results indicate that under the atmospheric pressure, the reduction approach from NbCl5(g) to Nb(s) is a stage-wise process with the formation of complex sub-chlorides, and is controllable at low hydrogen ratio (mole ratio of n(NbCl5):n(H2)<1:180) and low temperature (<1050 °C). Furthermore, a reasonable amount of inert loading gas is favorable to increase the reduction ratio of NbCl5 and the powder yield. The as-synthesized Nb nanopowder with the homogeneous size of 30-50 nm and the powder yield of 85% (mass fraction) is obtained by the CVS process under n(NbCl5):n(H2):n(Ar)=1:120:1 and 950 °C with the NbCl5 reduction rate of 96.1%.

AB - Thermodynamics for chemical vapor synthesis (CVS) of Nb nanopowder in NbCl5-H2-Ar system was investigated by using FactSage software. The validation experiments were conducted to confirm the thermodynamics points. The results indicate that under the atmospheric pressure, the reduction approach from NbCl5(g) to Nb(s) is a stage-wise process with the formation of complex sub-chlorides, and is controllable at low hydrogen ratio (mole ratio of n(NbCl5):n(H2)<1:180) and low temperature (<1050 °C). Furthermore, a reasonable amount of inert loading gas is favorable to increase the reduction ratio of NbCl5 and the powder yield. The as-synthesized Nb nanopowder with the homogeneous size of 30-50 nm and the powder yield of 85% (mass fraction) is obtained by the CVS process under n(NbCl5):n(H2):n(Ar)=1:120:1 and 950 °C with the NbCl5 reduction rate of 96.1%.

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