abstract |
Wherein the main component contains 40.0 to 49.8 mol% of iron oxide in terms of Fe 2 O 3 , 5.0 to 14.0 mol% of copper oxide in terms of CuO, 0 to 32.0 mol% of zinc oxide in terms of ZnO, 0.5 to 4.0% by weight of tin oxide in terms of SnO 2 , 0.10 to 1.00% by weight of bismuth oxide in terms of Bi 2 O 3 , 0.21 to 3.00% by weight of cobalt oxide in terms of Co 3 O 4 %. ≪ / RTI > |