Microwave synthesis of LaCrO3

Masato Iwasaki; Hirotsugu Takizawa; Kyota Uheda; Tadashi Endo; Masahiko Shimada

doi:10.1039/a804139c

Microwave synthesis of LaCrO₃

Masato Iwasaki, Hirotsugu Takizawa, Kyota Uheda, Tadashi Endo, Masahiko Shimada

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Abstract

The synthesis of LaCrO₃ from a stoichiometric mixture of Cr₂O₃ and La₂O₃ powder by microwave irradiation was examined using a multi-mode 28 GHz microwave heating system. In the La₂O₃-Cr₂O₃ system, Cr₂O₃ strongly absorbs microwaves while La₂O₃ is transparent to microwaves. The reaction proceeded rapidly and LaCrO₃ could be synthesised within 15 min of irradiation. Surprisingly, the temperature required for the microwave synthesis (440°C) is much lower than that for conventional synthesis (>1200°C) using an electric furnace. The effect of the partial pressure of oxygen in the microwave chamber on the formation of LnCrO₃ was investigated. The formation of LnCrO₃ is enhanced with increase in the partial pressure of oxygen for Ln = La and Nd, while opposite behavior is seen for Ln = Gd, Tb, Dy and Ho.

Original language	English
Pages (from-to)	2765-2768
Number of pages	4
Journal	Journal of Materials Chemistry
Volume	8
Issue number	12
DOIs	https://doi.org/10.1039/a804139c
Publication status	Published - 1998 Dec

ASJC Scopus subject areas

Chemistry(all)
Materials Chemistry

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title = "Microwave synthesis of LaCrO3",

abstract = "The synthesis of LaCrO3 from a stoichiometric mixture of Cr2O3 and La2O3 powder by microwave irradiation was examined using a multi-mode 28 GHz microwave heating system. In the La2O3-Cr2O3 system, Cr2O3 strongly absorbs microwaves while La2O3 is transparent to microwaves. The reaction proceeded rapidly and LaCrO3 could be synthesised within 15 min of irradiation. Surprisingly, the temperature required for the microwave synthesis (440°C) is much lower than that for conventional synthesis (>1200°C) using an electric furnace. The effect of the partial pressure of oxygen in the microwave chamber on the formation of LnCrO3 was investigated. The formation of LnCrO3 is enhanced with increase in the partial pressure of oxygen for Ln = La and Nd, while opposite behavior is seen for Ln = Gd, Tb, Dy and Ho.",

author = "Masato Iwasaki and Hirotsugu Takizawa and Kyota Uheda and Tadashi Endo and Masahiko Shimada",

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T1 - Microwave synthesis of LaCrO3

AU - Iwasaki, Masato

AU - Takizawa, Hirotsugu

AU - Uheda, Kyota

AU - Endo, Tadashi

AU - Shimada, Masahiko

PY - 1998/12

Y1 - 1998/12

N2 - The synthesis of LaCrO3 from a stoichiometric mixture of Cr2O3 and La2O3 powder by microwave irradiation was examined using a multi-mode 28 GHz microwave heating system. In the La2O3-Cr2O3 system, Cr2O3 strongly absorbs microwaves while La2O3 is transparent to microwaves. The reaction proceeded rapidly and LaCrO3 could be synthesised within 15 min of irradiation. Surprisingly, the temperature required for the microwave synthesis (440°C) is much lower than that for conventional synthesis (>1200°C) using an electric furnace. The effect of the partial pressure of oxygen in the microwave chamber on the formation of LnCrO3 was investigated. The formation of LnCrO3 is enhanced with increase in the partial pressure of oxygen for Ln = La and Nd, while opposite behavior is seen for Ln = Gd, Tb, Dy and Ho.

AB - The synthesis of LaCrO3 from a stoichiometric mixture of Cr2O3 and La2O3 powder by microwave irradiation was examined using a multi-mode 28 GHz microwave heating system. In the La2O3-Cr2O3 system, Cr2O3 strongly absorbs microwaves while La2O3 is transparent to microwaves. The reaction proceeded rapidly and LaCrO3 could be synthesised within 15 min of irradiation. Surprisingly, the temperature required for the microwave synthesis (440°C) is much lower than that for conventional synthesis (>1200°C) using an electric furnace. The effect of the partial pressure of oxygen in the microwave chamber on the formation of LnCrO3 was investigated. The formation of LnCrO3 is enhanced with increase in the partial pressure of oxygen for Ln = La and Nd, while opposite behavior is seen for Ln = Gd, Tb, Dy and Ho.

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JO - Journal of Materials Chemistry

JF - Journal of Materials Chemistry

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ER -

Microwave synthesis of LaCrO₃

Abstract

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