Role of Fe, Mn, and Zn ions as dopants on the electrical conductivity behavior of sodium phosphate glass

Abstract

Sodium phosphate glass undoped and doped with different concentrations of chlorides of iron, manganese, and zinc were prepared by melt quenching. The synthesized glasses were characterized by elemental analysis, X-ray diffraction, infrared (IR) spectroscopy, differential scanning calorimetry, and electrical conductivity studies. The undoped sodium phosphate glass (Na 2 O-P 2 O 5 ) has low electrical conductivity σ compared to all doped glasses except for 10% FeCl 3 -doped samples for which σ is found to be the lowest, and the trend isThe Na 2 O-P 2 O 5 -5% ZnCl 2 , Na 2 O-P 2 O 5 -5% MnCl 2 and Na 2 O-P 2 O 5 -1% FeCl 3 glassy systems yielded maximum σ values. These results are explained on the basis of changes in the structure of sodium phosphate glass matrix by the addition of Fe, Mn, and Zn ions based on IR spectra and DSC studies.

Ultrafast nano-spherical single-crystalline LiMn0.792Fe0.198Mg0.010PO4solid-solution confined among unbundled interstices of SGCNTs

“…30 Electrochemical characterization showed an excellent rate capability delivering 120 mA h g À1 at 10 C, while their EELS mapping indicates that the observed improvement in properties resulted from the shortened Li + diffusion path. In addition to changing particle size, improved performances on the capacity delivery, cycle life, and rate capability of LiMn x Fe 1Àx PO 4 can be achieved by cation doping of such Ni, 31 Co, 32 Zn, 33 Mg, 20,34 Gd, 35 V, 35 Cu, 36 Ti, 37 Zr, 37 Sn, 38 Al, 29 and W. 29 Divalent cation substitution using Mg 2+ , Zn 2+ , Cu 2+ , Ni 2+ , or Co 2+ was shown to signicantly improve conductivity as well. Doping of Mg 2+ , in particular, decreases the lattice mists near the LiFe 0.48 Mn 0.48 Mg 0.04 PO 4 /Fe 0.48 Mn 0.48 Mg 0.04 PO 4 boundary due to the occurrence of a pseudo-one phase reaction during Li + extraction.…”