| 摘要 |
Firing is carried out such that for operation of a partial pressure of oxygen and temperature at the high-temperature holding operation phase and cooling operation phase, the following equilibrium relation equation (1) indicative of an equilibrium relation of a partial pressure of oxygen (PO<SUB>2 </SUB>in %) to a temperature (T in absolute temperature K) is used to set the values of a and b at given values of a=a* and b=b*, respectively, <?in-line-formulae description="In-line Formulae" end="lead"?>Log(PO<SUB>2</SUB>)=a-b/T Eq. (1)<?in-line-formulae description="In-line Formulae" end="tail"?> and Log(PO<SUB>2</SUB>)=a*-b*/T that is a basic relation equation for operation of the partial pressure oxygen (PO<SUB>2</SUB>) and temperature (T) is fixed as an basic equation for operation; the partial pressure of oxygen (PO<SUB>2</SUB>) at the high-temperature holding operation phase is operated at a partial pressure of oxygen p 2 that is higher than the value of an equilibrium partial pressure of oxygen PO<SUB>2</SUB>=p 1 determined from an equilibrium relation to temperature based on the basic equation for operation Log(PO<SUB>2</SUB>)=a*-b*/T: p 2 >p 1 ; and the partial pressure of oxygen (PO<SUB>2</SUB>) at the cooling operation phase is operated at an equilibrium partial pressure of oxygen determined from an equilibrium relation to temperature based on the basic equation Log(PO<SUB>2</SUB>)=a*-b*/T. It is thus possible to obtain a MnZn-base ferrite having well-balanced properties: high saturation flux density and low core loss.
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