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), an antimony oxide fine powder (whose average particle size is about 2 to 3 μm), and a chromium oxide powder (whose average particle size is about 0.5 to 1.5 μm) were mixed at a weight ratio of 85:10:5. The mixed powder was heat treated at a temperature of 500° C. for 1 hr. Further, bismuth oxide fine particles and a boron oxide fine powder (whose average particle size is about 2 to 3 μm) were mixed at a weight ratio of 93:7. The mixed powder was heat treated at a temperature of 600° C. for 10 mins. These were blended at a weight ratio of 8:2 and 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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