Thermodynamic stability of γ-aluminum oxynitride

Wataru Nakao; Hiroyuki Fukuyama; Kazuhiro Nagata

doi:10.1149/1.1537757

Thermodynamic stability of γ-aluminum oxynitride

Wataru Nakao, Hiroyuki Fukuyama, Kazuhiro Nagata

IMRAM - Center for Mineral Processing and Metallurgy (CMPM)

Tokyo Institute of Technology

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

14 Citations (Scopus)

Abstract

For the purpose of determining the thermodynamic stability of γ-aluminum oxynitride spinel, alon, equilibrium N₂-CO gas compositions coexisting with alon-Al₂O₃-graphite have been measured by means of gas chromatography and quadrupole mass spectrometry in the temperature range from 1908 to 2023 K. From the results obtained, the standard Gibbs energy change of the carbothermal nitridation reaction of Al₂O₃ to form alon 64+x/3x Al₂O₃(s) + 3C(s) + N₂(g) = 2/x Al_(64+x)/3V_(8-x)/3O_32-xN_x(Al₂O sat.) + 3CO(g) has been determined to be Δ_rG°/kJ = 726.2 - 0.3611T (±0.7) (1908-2023 K) where alon is expressed as Al_(64+x)/3V_(8-x)/3O_32-xN_x (V is vacancy). Using the obtained Gibbs energy change, the eutectoid decomposition temperature of alon into α-Al₂O₃ and AlN has been evaluated to be 1903 ± 4 K, and the chemical potential diagram of the Al-O-N-C system has been constructed at 2000 K.

Original language	English
Pages (from-to)	J1-J7
Journal	Journal of the Electrochemical Society
Volume	150
Issue number	2
DOIs	https://doi.org/10.1149/1.1537757
Publication status	Published - 2003 Feb

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1149/1.1537757

Cite this

@article{0cfd4dd6b63847c8b54991f6f245429f,

title = "Thermodynamic stability of γ-aluminum oxynitride",

abstract = "For the purpose of determining the thermodynamic stability of γ-aluminum oxynitride spinel, alon, equilibrium N2-CO gas compositions coexisting with alon-Al2O3-graphite have been measured by means of gas chromatography and quadrupole mass spectrometry in the temperature range from 1908 to 2023 K. From the results obtained, the standard Gibbs energy change of the carbothermal nitridation reaction of Al2O3 to form alon 64+x/3x Al2O3(s) + 3C(s) + N2(g) = 2/x Al(64+x)/3V(8-x)/3O32-xNx(Al2 O sat.) + 3CO(g) has been determined to be ΔrG°/kJ = 726.2 - 0.3611T (±0.7) (1908-2023 K) where alon is expressed as Al(64+x)/3V(8-x)/3O32-xNx (V is vacancy). Using the obtained Gibbs energy change, the eutectoid decomposition temperature of alon into α-Al2O3 and AlN has been evaluated to be 1903 ± 4 K, and the chemical potential diagram of the Al-O-N-C system has been constructed at 2000 K.",

author = "Wataru Nakao and Hiroyuki Fukuyama and Kazuhiro Nagata",

year = "2003",

month = feb,

doi = "10.1149/1.1537757",

language = "English",

volume = "150",

pages = "J1--J7",

journal = "Journal of the Electrochemical Society",

issn = "0013-4651",

publisher = "Electrochemical Society, Inc.",

number = "2",

}

TY - JOUR

T1 - Thermodynamic stability of γ-aluminum oxynitride

AU - Nakao, Wataru

AU - Fukuyama, Hiroyuki

AU - Nagata, Kazuhiro

PY - 2003/2

Y1 - 2003/2

N2 - For the purpose of determining the thermodynamic stability of γ-aluminum oxynitride spinel, alon, equilibrium N2-CO gas compositions coexisting with alon-Al2O3-graphite have been measured by means of gas chromatography and quadrupole mass spectrometry in the temperature range from 1908 to 2023 K. From the results obtained, the standard Gibbs energy change of the carbothermal nitridation reaction of Al2O3 to form alon 64+x/3x Al2O3(s) + 3C(s) + N2(g) = 2/x Al(64+x)/3V(8-x)/3O32-xNx(Al2 O sat.) + 3CO(g) has been determined to be ΔrG°/kJ = 726.2 - 0.3611T (±0.7) (1908-2023 K) where alon is expressed as Al(64+x)/3V(8-x)/3O32-xNx (V is vacancy). Using the obtained Gibbs energy change, the eutectoid decomposition temperature of alon into α-Al2O3 and AlN has been evaluated to be 1903 ± 4 K, and the chemical potential diagram of the Al-O-N-C system has been constructed at 2000 K.

AB - For the purpose of determining the thermodynamic stability of γ-aluminum oxynitride spinel, alon, equilibrium N2-CO gas compositions coexisting with alon-Al2O3-graphite have been measured by means of gas chromatography and quadrupole mass spectrometry in the temperature range from 1908 to 2023 K. From the results obtained, the standard Gibbs energy change of the carbothermal nitridation reaction of Al2O3 to form alon 64+x/3x Al2O3(s) + 3C(s) + N2(g) = 2/x Al(64+x)/3V(8-x)/3O32-xNx(Al2 O sat.) + 3CO(g) has been determined to be ΔrG°/kJ = 726.2 - 0.3611T (±0.7) (1908-2023 K) where alon is expressed as Al(64+x)/3V(8-x)/3O32-xNx (V is vacancy). Using the obtained Gibbs energy change, the eutectoid decomposition temperature of alon into α-Al2O3 and AlN has been evaluated to be 1903 ± 4 K, and the chemical potential diagram of the Al-O-N-C system has been constructed at 2000 K.

UR - http://www.scopus.com/inward/record.url?scp=0037324017&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0037324017&partnerID=8YFLogxK

U2 - 10.1149/1.1537757

DO - 10.1149/1.1537757

M3 - Article

AN - SCOPUS:0037324017

SN - 0013-4651

VL - 150

SP - J1-J7

JO - Journal of the Electrochemical Society

JF - Journal of the Electrochemical Society

IS - 2

ER -

Thermodynamic stability of γ-aluminum oxynitride

Abstract

UN SDGs

Access to Document

Other files and links

Fingerprint

Cite this