Thermochemistry of Si6-zAlzOzN8-z (z = 0 to 3.6) materials

Jian Jie Liang; Alexandra Navrotsky; Valerie J. Leppert; Michael J. Paskowitz; Subhash H. Risbud; Thomas Ludwig; Hans J. Seifert; Fritz Aldinger; Mamoru Mitomo

doi:10.1557/JMR.1999.0626

Thermochemistry of Si_6-zAl_zO_zN_8-z (z = 0 to 3.6) materials

Jian Jie Liang, Alexandra Navrotsky, Valerie J. Leppert, Michael J. Paskowitz, Subhash H. Risbud, Thomas Ludwig, Hans J. Seifert, Fritz Aldinger, Mamoru Mitomo

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

26 Scopus citations

Abstract

Enthalpies of formation were determined for β-sialon phases (Si_6-zAl_zO_zN_8-z, z = 0.46 to 3.6) by high-temperature oxidative drop solution calorimetry using an alkali-metal borate (52 wt% LiBo₂; 48 wt% NaBO₂) solvent. Oxygen gas was bubbled through the melt to accelerate oxidation of the oxynitride samples during dissolution. Sialons near z = 2 appear less stable energetically than ones with higher or lower nitrogen content. A large configurational entropy contribution for sialons with z>2 may further stabilize these materials. This larger free energy driving form may be the reason for success in pulse-activated processing of these materials. The enthalpies of formation further suggest that a greater driving form for oxynitride formation exists in batch synthesis using SiO₂ rather than Al₂O₃.

Original language	English (US)
Pages (from-to)	4630-4636
Number of pages	7
Journal	Journal of Materials Research
Volume	14
Issue number	12
DOIs	https://doi.org/10.1557/JMR.1999.0626
State	Published - Dec 1999
Externally published	Yes

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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@article{fbe1dc0cbd7a4700b551c1a35009e17b,

title = "Thermochemistry of Si6-zAlzOzN8-z (z = 0 to 3.6) materials",

abstract = "Enthalpies of formation were determined for β-sialon phases (Si6-zAlzOzN8-z, z = 0.46 to 3.6) by high-temperature oxidative drop solution calorimetry using an alkali-metal borate (52 wt% LiBo2; 48 wt% NaBO2) solvent. Oxygen gas was bubbled through the melt to accelerate oxidation of the oxynitride samples during dissolution. Sialons near z = 2 appear less stable energetically than ones with higher or lower nitrogen content. A large configurational entropy contribution for sialons with z>2 may further stabilize these materials. This larger free energy driving form may be the reason for success in pulse-activated processing of these materials. The enthalpies of formation further suggest that a greater driving form for oxynitride formation exists in batch synthesis using SiO2 rather than Al2O3.",

author = "Liang, {Jian Jie} and Alexandra Navrotsky and Leppert, {Valerie J.} and Paskowitz, {Michael J.} and Risbud, {Subhash H.} and Thomas Ludwig and Seifert, {Hans J.} and Fritz Aldinger and Mamoru Mitomo",

note = "Funding Information: The work is supported by the Department of Energy (DOE), Grant No. DOE DE-FG03-97ER45654, for calorimetry laboratory support and part of J-J.L.{\textquoteright}s salary; the National Science Foundation, Grant No. NSF INT-9796329, for travel; the Natural Science and Engineering Council of Canada, for part of J-J. L.{\textquoteright}s salary; and the German DAAD agency, for travel.",

year = "1999",

month = dec,

doi = "10.1557/JMR.1999.0626",

language = "English (US)",

volume = "14",

pages = "4630--4636",

journal = "Journal of Materials Research",

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T1 - Thermochemistry of Si6-zAlzOzN8-z (z = 0 to 3.6) materials

AU - Liang, Jian Jie

AU - Navrotsky, Alexandra

AU - Leppert, Valerie J.

AU - Paskowitz, Michael J.

AU - Risbud, Subhash H.

AU - Ludwig, Thomas

AU - Seifert, Hans J.

AU - Aldinger, Fritz

AU - Mitomo, Mamoru

N1 - Funding Information: The work is supported by the Department of Energy (DOE), Grant No. DOE DE-FG03-97ER45654, for calorimetry laboratory support and part of J-J.L.’s salary; the National Science Foundation, Grant No. NSF INT-9796329, for travel; the Natural Science and Engineering Council of Canada, for part of J-J. L.’s salary; and the German DAAD agency, for travel.

PY - 1999/12

Y1 - 1999/12

N2 - Enthalpies of formation were determined for β-sialon phases (Si6-zAlzOzN8-z, z = 0.46 to 3.6) by high-temperature oxidative drop solution calorimetry using an alkali-metal borate (52 wt% LiBo2; 48 wt% NaBO2) solvent. Oxygen gas was bubbled through the melt to accelerate oxidation of the oxynitride samples during dissolution. Sialons near z = 2 appear less stable energetically than ones with higher or lower nitrogen content. A large configurational entropy contribution for sialons with z>2 may further stabilize these materials. This larger free energy driving form may be the reason for success in pulse-activated processing of these materials. The enthalpies of formation further suggest that a greater driving form for oxynitride formation exists in batch synthesis using SiO2 rather than Al2O3.

AB - Enthalpies of formation were determined for β-sialon phases (Si6-zAlzOzN8-z, z = 0.46 to 3.6) by high-temperature oxidative drop solution calorimetry using an alkali-metal borate (52 wt% LiBo2; 48 wt% NaBO2) solvent. Oxygen gas was bubbled through the melt to accelerate oxidation of the oxynitride samples during dissolution. Sialons near z = 2 appear less stable energetically than ones with higher or lower nitrogen content. A large configurational entropy contribution for sialons with z>2 may further stabilize these materials. This larger free energy driving form may be the reason for success in pulse-activated processing of these materials. The enthalpies of formation further suggest that a greater driving form for oxynitride formation exists in batch synthesis using SiO2 rather than Al2O3.

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Thermochemistry of Si_6-zAl_zO_zN_8-z (z = 0 to 3.6) materials

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