  This paper proposes a systematic way to explore the effects of Na on Bi-2212
phase formation. The influence of sodium metal is correlated with the 2212
fraction formed in the sample. The effect on the sintering temperature and the
importance of the substitution site is studied. Samples are characterized by
X-ray diffraction analysis (XRD). Results clearly show that the 2212 phase
content is enhanced and sintering temperatures can be lowered with regard to
the undoped samples.
