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应用平均场重整化群方法，讨论表面无规场（三峰分布）存在时S=1和σ=1/2混合自旋伊辛系统的表面临界行为，得到了系统的表面相图．In this paper,a renormalization group scheme within the framework of the mean field theory is used to investigate the critical behavior at the surface of a semi infinite Ising system with mixed spins,i.e.S=1 at the surface and σ=1/2 in the bulk.The effects of a random field on the surface phase diagrams are obtained.
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