The stress dependence of the β-Si3N4 infrared-active band appearing at ∼1020 cm-1 was evaluated by using micro-FT-IR. A four-point-bending jig was built to apply stress to the sample. Two β-Si3N4 ceramics, prepared by pressureless sintering and hot-pressed sintering, were examined. The hot-pressed sample showed a linear relation to applied stress, whereas the pressureless sintered sample showed relatively scattered stress dependence due to the inferior signal-to-noise ratio of the spectra. The stress dependence parameter of the 1020 cm-1 band was evaluated as ∼2 cm-1/GPa.
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