An integral equarion of the Curie temperature for the Blume-Emey-Gfiths model is derived. Numerical integration ir c a n i d out and the results for sc, 8cc and FCC lattices are presentedThe spin-I king model with both bilinear and biquadratic interactions along with the single-ion anisotropy is expressed bywhere hi is the external field acting on site i, D is the strength of the single-ion anhtropy, and J i j and ,Tij represent the bilinear and biquadratic exchange integrals respectively. The above equation is usually referred to as the Blume-EmeryGrSiths (BEG) (1971) model and has been studied by several workers during the past few
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