TY - JOUR
T1 - Oxide and interface characteristics of oxidized silicon oxynitride ceramics - An investigation by electron microscopy
AU - Manessis, D.
AU - Du, Honghua
AU - Larker, R.
PY - 1998
Y1 - 1998
N2 - Hot-isostatically pressed silicon oxynitride (Si2N2O) ceramics free from sintering aids were oxidized in 1 atm dry oxygen at 1100 and 1300 °C. The structural and chemical characteristics of the oxide and the nature of the oxide-Si2N2O interface were determined using cross-sectional transmission electron microscopy in conjunction with small-probe energy dispersive X-ray analysis and selected-area electron diffraction. Oxidation of Si2N2O resulted in the formation of amorphous SiO2. The oxide-Si2N2O interface was chemically abrupt. The interface was very flat when parallel to low-index, high atomic density Si2N2O crystal planes but became notably undulated if oriented to high index, low atomic density planes. About 6 vol % residual SiO2 phase was present in the bulk of the Si2N2O ceramics. Current results have provided an important baseline for the understanding of the oxidation behaviour of Si2N2O.
AB - Hot-isostatically pressed silicon oxynitride (Si2N2O) ceramics free from sintering aids were oxidized in 1 atm dry oxygen at 1100 and 1300 °C. The structural and chemical characteristics of the oxide and the nature of the oxide-Si2N2O interface were determined using cross-sectional transmission electron microscopy in conjunction with small-probe energy dispersive X-ray analysis and selected-area electron diffraction. Oxidation of Si2N2O resulted in the formation of amorphous SiO2. The oxide-Si2N2O interface was chemically abrupt. The interface was very flat when parallel to low-index, high atomic density Si2N2O crystal planes but became notably undulated if oriented to high index, low atomic density planes. About 6 vol % residual SiO2 phase was present in the bulk of the Si2N2O ceramics. Current results have provided an important baseline for the understanding of the oxidation behaviour of Si2N2O.
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U2 - 10.1023/A:1026449331258
DO - 10.1023/A:1026449331258
M3 - Article
AN - SCOPUS:0032157512
SN - 0022-2461
VL - 33
SP - 4447
EP - 4453
JO - Journal of Materials Science
JF - Journal of Materials Science
IS - 17
ER -