Chromium oxide → Bismuth oxide antimony oxide chromium oxide boron oxide

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A bismuth oxide powder (whose average particle size is about 2 to 3 μm) and an antimony oxide fine powder (whose average particle size is about 2 to 3 μm) were mixed at a weight ratio of 85:15. The mixed powder was heat treated at a temperature of 550° C. for 5 hrs. Further, a bismuth oxide powder (whose average particle size is about 2 to 3 μm), a chromium oxide fine powder (whose average particle size is about 0.5 to 1.5 μm) and a boron oxide powder (whose average particle size is about 2 to 3 μm) were mixed at a weight ratio of 93:2:4. The mixed powder was heat treated at a temperature of 500° C. for 1 hr. The mixed powder which was heat treated was ground fine to obtain a synthetic powder of bismuth oxide/antimony oxide/chromium oxide/boron oxide (whose average particle size is about 2 to 3 μm).

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