Figure 1.

X-ray diffraction patterns. The X-ray diffraction patterns of (a) Al₂O₃ thick film, (b) Al₂O₃-polyimide composite film (4 vol.%), (c) Al₂O₃-polyimide composite film (8 vol.%), (d) Al₂O₃-polyimide composite film (12 vol.%), and (e) α-Al₂O₃ starting powder.