Abstracts Book - IMRC 2018

• SC1-P005
STRUCTURAL AND ELECTRICAL BEHAVIOR OF Na + -SUPER IONIC
CONDUCTOR GLASS-CERAMICS
Adriana Marcela Nieto Munoz 1 , Ana Candida Martins Rodrigues 2
1 Universidade Federal de São Carlos, PPG-CEM, Brazil. 2 Universidade Federal de São Carlos,
Department of Materials Engineering, Brazil.
In recent years, the search for new sources of energy has attracted greater
interest, as consequence mainly of the increase in energy consumption and the
decrease of natural resources available to satisfy this demand. Factors such as
low production cost and low environmental impact are characteristics that make
sodium-based materials promising candidates to be employed in the
manufacture of stationary batteries. NASICON materials stand out among
sodium-ion conducting materials, because of their high ionic conductivity,
especially when aliovalent substitution of some metallic ions are processed in
their structure. In fact, the decompensation of charge produced by the new
hosted ions, allows the introduction of a greater number of charge carriers into
the structure, generally leading to an increase in electrical conductivity. In this
sense, to improve the ionic conductivity of the NaTi(PO4)3 system, different
amounts of silicon (y) were added to replace the phosphorus ions in the
structure, also increasing the amount of Na + ions, leading to the formula,
Na1+yTiP3-ySiyO3. The materials were obtained via glass-ceramic route through
the controlled crystallization of a precursor glass. Samples were characterized
by X-ray diffraction (XRD), scanning electron microscopy and complex
impedance spectroscopy. XRD results show that after crystallization heattreatments,
the NASICON phase is obtained as the major phase for
compositions y≤0.8. However, for y>0.8, a new phase with similar structure to
NASICON is formed. Electrical behavior revealed that the presence of this new
phase increases the ionic conductivity in more than three orders of magnitude
with respect to the system without silicon.
Keywords: Glass-ceramic, NASICON, ionic conductivity
Presenting authors email: adriananietomunoz@gmail.com