Single crystal of Mn-substituted NiZn Ferrite grown by the Bridgman method

A high oxygen pressure is requited in growing single crystal NiZn ferrite of a stoichiometric composition by the Bridgman method. As pointed out in a previous paper, the oxygen pressure could be lowered by partial substituting of NiO with MnO. The relationship between the amount of MnO substitution and the oxygen pressure required in growing single crystals of NiZn ferrite having about 50 mol% of Fe2O3is investigated. In single crystals of NiZn ferrite containing 6 mol% MnO (NM 6), an oxygen pressure of 100 Kg/cm²is required, while those with 8 mol% MnO (NM 8) requite 50 Kg/cm²oxygen pressure and a 12 mol% MnO (NM 12), 1 Kg/cm²oxygen pressure. Magnetic permeability of the single crystals before annealing at 50 MHz was 100 for NM 12, 120 for NM 8, and 130 for NM 6; with cm and B20> 3300 G.