  In this thesis is studied three of the fundamental properties of clusters of
matter made of quarks u, d and s called strangelets: the energy per baryon, the
radius and the electric charge, all in the presence of intense magnetic fields
and finite temperature. Two cases will take our attention: unpaired phase
strangelets, where there is no restriction to the number of flavors of quarks,
and a particular case of the color superconducting phase, where exists a
restriction to the quark numbers and an additional energy gap. We study the
stability of strangelets, measured by the energy per baryon, to compare later
with that of the 56Fe : the most stable isotope known in nature. We employ the
Liquid Drop formalism of the Bag Model MIT to describe the interaction between
quarks. We conclude that the field effects tend to decrease the energy per
baryon of strangelets and temperature produces the opposite effect. It is also
shown that strangelets in the color superconducting phase are more stable than
those in the unpaired phase for an energy gap of about 100MeV. The radius of
strangelets shows an analogous behavior with the baryon number, as that of the
nuclei, and shows small variations with the magnetic field and temperature. It
is obtained that the presence of magnetic fields modify the values of the
electric charge regarding the non-magnetized case, being these higher (lower)
for strangelets in the unpaired phase (superconducting).
