  In this work we study the influence of external electric field and
temperature on the chiral phase transition of Quantum Chromodynamics. We use
the two-flavor Linear Sigma Model coupled with quarks (LSMq) in a thermal and
electrized medium to evaluate the effective quark mass and the Schwinger pair
production. To this end, we apply one-loop correction to the fermionic sector
of the model and the simple tree-level approximation in the mesonic
contributions. The electric fields strengthen the partial restoration of the
chiral symmetry when applied with finite temperature in a crossover transition.
The expected decrease of the pseudocritical temperature as a function of the
electric field is observed until electric fields reach $eE\approx 13.5
m_{\pi}^2$. For stronger electric fields, the effect is the opposite, which is
in a very good agreement with previous results obtained with four-point
non-renormalizable models, showing that this effect is independent of
renormalizability issues. We also show the thermal and electric effects on the
behavior of the Schwinger pair production.
