Chromium oxide → Bismuth oxide antimony oxide chromium oxide

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A bismuth oxide powder (whose average particle size is about 2 to 3 μm) and an antimony oxide powder (whose average particle size is about 2 to 3 μm) were blended at a weight ratio of 85:15. The blended powder was heat treated at a temperature of 550° C. for 5 hrs. in the air. Further, bismuth oxide fine particles (whose average particle size is about 2 to 3 μm) and chromium oxide fine powder (whose average particle size is about 0.5 to 1.5 μm) were mixed at a weight ratio of 75:25. The mixed powder was heat treated at a temperature of 550° C. for 5 hrs. in the air. These were blended at a weight ratio of 10:1 and ground fine for 18 hrs. by a wet method by means of stabilizing zirconia balls in a monomalon pot. Consequently, a synthetic powder of bismuth oxide/antimony oxide/chromium oxide (whose average particle size is about 2 to 3 μm) was obtained.

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