Barium-Strontium Ferrite Disc Magnet: 0.21 mol BaCO3, 0.09 mol SrCO3, 1300 °C (Went, Philips 1956, Ex. 30)

A ceramic magnet with both barium and strontium: 0.21 mol barium carbonate and 0.09 mol strontium carbonate to 2.7 mol iron oxide, milled as in Example 28, pressed and passed through a 1300 °C furnace in 10 minutes. Went's rod held 1,245 gauss with a coercive force of 2,370 oersted. Source: J. J. Went, G. W. van Oosterhout and E. W. Gorter (Philips), US 2,762,777 (1956), Example 30. They sintered rods; discs and the magnetising are ours. Picture: ferrite magnets, Omegatron, Wikimedia Commons, CC BY-SA 3.0.