Abstract
An effective-field theory with correlations is developed for a diluted mixed sping- 1 2 and spin-1 Ising ferromagnetic system with a crystal-field interaction D in a square lattice ( Z = 4). The phase diagrams in temperature-concentration of magnetic atoms ( p) and in temperature-crystal field interaction planes exhibit a variety of interesting phenomena such as second order phase transitions, tricritical points and first order phase transitions. The reentrant phenomena are also observed.
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