The magnetic properties of diluted mixed spin-1/2 and spin-1 Ising magnetic systems with crystal-field interactions on square lattice (z = 4) are investigated by the use of the effective-field theory with correlations. Especially the numerical results are given. The influence of concentrations of magnetic atoms P-alpha (alpha = A or B represent the two sublattices) and crystal-field interaction D on the properties of this system is discussed. The results show that the tricritical point, the reentrant phenomena and two compensation points exist.
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