Mixed Ionic and Electronic Conduction in TeO[sub.2]-ZnO-V[sub.2]O[sub.5] Glasses towards Good Dielectric Features

• Published in: Materials Vol. 15; no. 21
• Main Authors: Mechrgui, Imen, Ben Gouider Trabelsi, Amira, Alkallas, Fatemah. H, Nasri, Saber, Elhouichet, Habib
• Format: Journal Article
• Language: English
• Published: MDPI AG 01.10.2022
• Subjects: Electric properties; Zinc oxide; Tunisia
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma15217659

The melt-quenching technique was used to synthesize tellurite glasses of the chemical composition 80TeO[sub.2]-(20-x) ZnO-xV[sub.2]O[sub.5]. X-ray diffraction (XRD) patterns indicate the amorphous nature of the prepared glasses. Raman and FTIR measurements demonstrate a progressive substitution of the Te-O-Te linkages by the Te-O-V bridges and the formation of VO[sub.4] and VO[sub.5] units by a change of the vanadium coordination due to the higher number of oxygens incorporated by further addition of V[sub.2]O[sub.5]. The AC conductivity was investigated in the frequency range of 40 Hz to 10[sup.7] Hz between 473 K to 573 K. A good coherence of the AC conductivity was found using a model correlating the barrier hopping (CPH) and the dominant conduction process changes from ionic to polaronic with the addition of V[sub.2]O[sub.5]. The dielectric constant exhibits high values in the range of lower and medium frequencies. Both variations of the electric modulus and the dielectric loss parameters with frequency and temperature showed a relaxation character mainly assigned to the vanadate phases. The electric modulus displays a non-Debye dielectric dispersion and a relaxation process. The present results open the door to future zinc-tellurite glasses-doped vanadium exploitation as a potential electrolyte-based material for solid-state batteries.