TY - JOUR T1 - Effects of Fe2O3 substitution for K2O on the physical properties of 88P2O5xFe2O3–2CoO–(10x)K2O glasses JO - Boletín de la Sociedad Española de Cerámica y Vidrio T2 - AU - Bjaoui,Noureddine AU - Sdiri,Nasr AU - Valente,Manuel Almaida AU - Horchani-Naifer,Karima AU - Férid,Mokhtar SN - 03663175 M3 - 10.1016/j.bsecv.2020.02.001 DO - 10.1016/j.bsecv.2020.02.001 UR - https://www.elsevier.es/en-revista-boletin-sociedad-espanola-ceramica-vidrio-26-articulo-effects-fe2o3-substitution-for-k2o-S0366317520300236 AB - 88P2O5–xFe2O3–2CoO–(10−x)K2O glasses from x=0.0 to x=0.5 were prepared at 850°C using melt quenching technique.These glass systems were characterized by using X-ray diffraction, differential scanning calorimetry (DSC), magnetic measurements, Raman spectroscopy, Archimedes methods, Brewster spectrometer, UV–vis spectrophotometer and impedance spectroscopy. X-ray diffraction revealed that these glass systems have amorphous structure. DSC has showed that the thermal stability of the glass samples increased with the rate of iron. Raman spectra showed the presence of the P–O–Fe group which increases the rigidity of the glass samples. The density of our compounds increased with the increase of the amount of iron oxide.Magnetic measurements at 5K using vibrating sample magnetometer technique show antiferromagnetic behavior of these system glasses.According to the results of the optical absorption spectra, the values of the gap energy and Urbach energy decreased and the refractive index of the glass increased with the increase of the mole of Fe2O3. Brewster spectrophotometer has showed an optical index (n>1.5). On other hand, the chromatic coordinates of all samples to the area of blue–purple light emission.Electrical properties were studied using the technique of impedance alternative spectroscopy over a temperature range 423–623K in the frequency range of 40Hz–13MHz; conductivity under variable regime σac follows Jonscher's law. The conductivity σdc follows the Arrhenius law with an activation energy value too low (≈0.3eV) and decreased with the rate of iron, indicating polaronic conduction.The dielectric study showed high values of dielectric constant at low frequency with low loss at high frequency. The modulus revealed dipolar relaxations. ER -