  We study the thermodynamic properties of a relativistic magnetized neutral
vector boson gas at any temperature. By comparing the results with the low
temperature and the non relativistic descriptions of this gas, we found that
the fully relativistic case can be separated in two regimes according to
temperature. For low temperatures, magnetic field effects dominate and the
system shows a spontaneous magnetization, its pressure splits in two components
and, eventually, a transversal magnetic collapse might occur. In the high
temperature region, the gas behavior is led by pair production. The presence of
antiparticles preserves the isotropy in the pressure, and increases the
magnetization and the total pressure of the system by several orders.
Astrophysical implications of those behaviors are discussed.
