SILICON-29 MAS-NMR AND ESR STUDY ON THE EFFECT OF HEAT TREATMENT ON THE STRUCTURE OFSiC−Si3N4COMPOSITE ULTRAFINE PARTICLES

Masaaki Suzuki, Xingguo Li, Yoshinori Nakata, Hideaki Nagai and Takeshi Okutani
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Masaaki Suzuki: Hokkaido National Industrial Research Institute, 2–17–2–1, Tsukisamu-higashi, Toyohira-ku, Sapporo 062, Japan
Xingguo Li: Hokkaido National Industrial Research Institute, 2–17–2–1, Tsukisamu-higashi, Toyohira-ku, Sapporo 062, Japan;
Yoshinori Nakata: Hokkaido National Industrial Research Institute, 2–17–2–1, Tsukisamu-higashi, Toyohira-ku, Sapporo 062, Japan
Hideaki Nagai: Hokkaido National Industrial Research Institute, 2–17–2–1, Tsukisamu-higashi, Toyohira-ku, Sapporo 062, Japan
Takeshi Okutani: Hokkaido National Industrial Research Institute, 2–17–2–1, Tsukisamu-higashi, Toyohira-ku, Sapporo 062, Japan

Surface Review and Letters (SRL), 1996, vol. 03, issue 01, 85-89

Abstract: The effect of heat treatment on the structure ofSiC−Si3N4composite ultrafine particles was studied by29SiMAS-NMR and ESR.29SiMAS-NMR and ESR results showed that the local structure changed a little below 1573 K, at which the XRD pattern did not change significantly, but slight increase in crystalline size were observed. When theSiC−Si3N4powder was heat-treated at 1773 K, most nitrogen atoms dissolved into β-SiC lattice were removed from theβ-SiClattice, and the remaining nitrogens were considered to exist in the boundary layer between SiC crystals asSiC3Nunit in the particle.

Date: 1996
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DOI: 10.1142/S0218625X9600019X

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