Magnetic properties of a spin-1 triangular Ising system

•The triangular Ising system is investigated within EFT with correlations.•The effects of the interaction parameters on spin-1 BC model are studied.•The phase diagrams are found for the different interaction parameters.•The hysteresis behaviors of the system are examined.•The system shows the tricritical, tetracritical and critical end special points.

We studied some magnetic behaviors of the Blume-Capel (BC) model in a site diluted triangular lattice by means of the effective-field theory (EFT) with correlations. The effects of the exchange interaction (J), crystal field (D), concentration (p) and temperature (T) on the magnetic properties of the spin-1 BC model in a triangular lattice, such as magnetization, susceptibility, phase diagram and hysteresis behaviors, are investigated in detail. The phase diagrams of the system are presented in two different planes. The tricritical point as well as the tetracritical and critical end special points are found to depend on the physical parameters of the system. Moreover, when the hysteresis behaviors of the system are examined, single and double hysteresis loops are observed for various values of the physical parameters. We show that the hysteresis loops have different coercive field points in which the susceptibility makes a peak at these points.