Vibrational analysis and AC electrical conduction behavior of lithium zinc orthogermanate

• Published in: Ionics Vol. 27; no. 7; pp. 3027 - 3034
• Main Authors: Ben yahya, Sourour, Louati, Bassem
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 2021; Springer Nature B.V
• Subjects: Chemistry; Chemistry and Materials Science; Condensed Matter Physics; Dipole interactions; Electrical conduction; Electrical measurement; Electrochemistry; Energy Storage; Enthalpy; Frequency ranges; Lithium; Optical and Electronic Materials; Original Paper; Parameters; Renewable and Green Energy; Unit cell; Zinc; Wurtzite structure; Electrical properties; CBH model; Orthogermanate
• ISSN: 0947-7047; 1862-0760
• DOI: 10.1007/s11581-021-04061-6

The lithium zinc orthogermanate, Li 2 ZnGeO 4 , was synthesized by the solid-state reaction and characterized by X-ray diffraction (XRD) and electrical technique. Li 2 ZnGeO 4 is of monoclinic symmetry with the space group P n. The unit cell parameters are as follows: a = 6.368(2)Å, b = 5.438(2)Å, c = 5.034(1)Å, β = 90.191(0)°, and V =174.360(1)Å 3 . The electrical measurements were carried out by impedance spectroscopy in the temperature and frequency range (553–653)K and (40 Hz to 1 MHz), respectively. The AC conductivity was interpreted using Jonscher’s law. s parameter decreases while the temperature increases indicating that the CBH model is the most reasonable mechanism of AC conduction behavior. Thermodynamic parameters such as the enthalpy ΔH and the change in entropy ΔS have been calculated. The negative value of ΔS may be due to the existence of dipole-dipole interactions and suggests that the molecules are more nearly aligned with each other in the activated state.