Ferromagnetic Properties of Bond-Dilution and Random Positive orNegative Uniaxial Anisotropy Blume-Capel Model

We study the ferromagnetic properties of spin-1 system,which is considered in the frame of the bond-dilution and random positive ornegative anisotropy Blume-Capel model in the effective field theoryand a cutting approximation. The investigation of phase diagrams displayssome rich properties of the trajectory of tricritical point, reentrantphenomena at low temperatures. Under certain both bond concentrations andrandom negative anisotropy, there are new transition lines of doubletricritical points. So special emphasis is placed on the influence of thebond dilution and random anisotropy on phase diagrams. The magnetizations ofthe system are also discussed. Some results have not been revealed inprevious reports.