Kinetics of microwave synthesis of AlN by carbothermal-reduction-nitridation at low temperature

Hideaki Chikami; Jun Fukushima; Yamato Hayashi; Hirotsugu Takizawa

doi:10.1111/jace.15903

Kinetics of microwave synthesis of AlN by carbothermal-reduction-nitridation at low temperature

Hideaki Chikami, Jun Fukushima, Yamato Hayashi, Hirotsugu Takizawa

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

2 Citations (Scopus)

Abstract

Aluminum nitride (AlN) was synthesized at 1000-1400°C from a mixture of alumina and carbon powders using 2.45 GHz microwaves in a N₂ atmosphere. High nitridation ratios (>0.90) were obtained in the temperature range 1200-1400°C. The apparent activation energy of the carbothermal reduction and nitridation (CRN) reaction using 2.45 GHz microwave irradiation was calculated from the nitridation ratio. The value obtained, 79.9 kJ/mol, is 11% of the energy reported for conventional synthesis using α-Al₂O₃ as the raw material. This result indicates that 2.45 GHz microwave irradiation could promote the kinetics of the CRN reaction, and AlN could be effectively synthesized at low temperature.

Original language	English
Pages (from-to)	4905-4910
Number of pages	6
Journal	Journal of the American Ceramic Society
Volume	101
Issue number	11
DOIs	https://doi.org/10.1111/jace.15903
Publication status	Published - 2018 Nov

Keywords

activation energy
aluminum nitride
carbothermal reduction
microwaves
nitridation

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

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10.1111/jace.15903

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title = "Kinetics of microwave synthesis of AlN by carbothermal-reduction-nitridation at low temperature",

abstract = "Aluminum nitride (AlN) was synthesized at 1000-1400°C from a mixture of alumina and carbon powders using 2.45 GHz microwaves in a N2 atmosphere. High nitridation ratios (>0.90) were obtained in the temperature range 1200-1400°C. The apparent activation energy of the carbothermal reduction and nitridation (CRN) reaction using 2.45 GHz microwave irradiation was calculated from the nitridation ratio. The value obtained, 79.9 kJ/mol, is 11% of the energy reported for conventional synthesis using α-Al2O3 as the raw material. This result indicates that 2.45 GHz microwave irradiation could promote the kinetics of the CRN reaction, and AlN could be effectively synthesized at low temperature.",

keywords = "activation energy, aluminum nitride, carbothermal reduction, microwaves, nitridation",

author = "Hideaki Chikami and Jun Fukushima and Yamato Hayashi and Hirotsugu Takizawa",

year = "2018",

month = nov,

doi = "10.1111/jace.15903",

language = "English",

volume = "101",

pages = "4905--4910",

journal = "Journal of the American Ceramic Society",

issn = "0002-7820",

publisher = "Wiley-Blackwell",

number = "11",

}

TY - JOUR

T1 - Kinetics of microwave synthesis of AlN by carbothermal-reduction-nitridation at low temperature

AU - Chikami, Hideaki

AU - Fukushima, Jun

AU - Hayashi, Yamato

AU - Takizawa, Hirotsugu

PY - 2018/11

Y1 - 2018/11

N2 - Aluminum nitride (AlN) was synthesized at 1000-1400°C from a mixture of alumina and carbon powders using 2.45 GHz microwaves in a N2 atmosphere. High nitridation ratios (>0.90) were obtained in the temperature range 1200-1400°C. The apparent activation energy of the carbothermal reduction and nitridation (CRN) reaction using 2.45 GHz microwave irradiation was calculated from the nitridation ratio. The value obtained, 79.9 kJ/mol, is 11% of the energy reported for conventional synthesis using α-Al2O3 as the raw material. This result indicates that 2.45 GHz microwave irradiation could promote the kinetics of the CRN reaction, and AlN could be effectively synthesized at low temperature.

AB - Aluminum nitride (AlN) was synthesized at 1000-1400°C from a mixture of alumina and carbon powders using 2.45 GHz microwaves in a N2 atmosphere. High nitridation ratios (>0.90) were obtained in the temperature range 1200-1400°C. The apparent activation energy of the carbothermal reduction and nitridation (CRN) reaction using 2.45 GHz microwave irradiation was calculated from the nitridation ratio. The value obtained, 79.9 kJ/mol, is 11% of the energy reported for conventional synthesis using α-Al2O3 as the raw material. This result indicates that 2.45 GHz microwave irradiation could promote the kinetics of the CRN reaction, and AlN could be effectively synthesized at low temperature.

KW - activation energy

KW - aluminum nitride

KW - carbothermal reduction

KW - microwaves

KW - nitridation

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