Synthesis, optical and ionic conductivity studies of a lithium cobalt germanate compound.
Sourour Ben YahyaRegis BarilléBassem LouatiPublished in: RSC advances (2022)
A lithium cobalt germanate compound (Li 2 CoGeO 4 ) was synthesized and studied. The X-ray powder diffraction pattern demonstrated a monoclinic crystal system with the Pn space group. The morphology and composition were done by scanning transmission electron microscopy and energy dispersive X-ray spectroscopy (SEM-EDS). A vibrational study confirmed the existence of the anion (GeO 4 ) 4- and its vibrations. The estimated value of the direct band gap ( E g ) was evaluated at 3.45 eV. The measurements of the electrical properties were performed in the frequency interval from 100 Hz to 1 MHz and the temperature range from 553 K to 663 K. The Nyquist plots revealed the existence of a single semicircle in all impedance spectra due to the grain interior effect. The AC electrical conduction in Li 2 CoGeO 4 has been explained through several processes, which can be coupled with two different formalisms. The complex electric modulus studies M *( ω ) confirmed that the relaxation process is thermally activated.
Keyphrases
- electron microscopy
- solid state
- ionic liquid
- high resolution
- density functional theory
- case control
- reduced graphene oxide
- single cell
- dual energy
- metal organic framework
- magnetic resonance imaging
- solid phase extraction
- computed tomography
- molecular dynamics
- gas chromatography mass spectrometry
- gas chromatography
- light emitting
- simultaneous determination
- tandem mass spectrometry