Synthesis, structural characterization and electrical conduction mechanism of the new organic–inorganic complex: ([(C3H7)4N]FeCl4)

Disordered structures, vibrational spectroscopy, thermal behavior, and electrical properties of two new tetrachlorometallates complexes [(CH3CH2CH2)4N]2MIICl4 with MII = Co and Mn

Structural phase transition, vibrational analysis, ionic conductivity and conduction mechanism studies in an organic-inorganic hybrid crystal: [N(CH3)3H]2CdCl4

Synthesis, Crystal Structure, Optical Properties and Stability of New Bismuth-Based Organic-Inorganic Compounds (C6H9N2)aBibXc (X=Cl, Br, I)

The alkylammonium halogenoferrate families are subjected to diverse studies according to their wide field application. However, these compounds show various transitions depending on the preparation process. In this paper, the [(C2H5)4N]FeCl4 compound was successfully synthesized using a slow evaporation solution growth method at room temperature. An optical absorption measurement confirms the semiconductor nature with a band gap around 2.95 eV. The X-ray powder diffraction (XRPD) data confirmed the formation of a single-phase with hexagonal-type structure. The differential scanning calorimetry (DSC) indicated that the [(C2H5)4N]FeCl4 compound undergoes eight reversible phase transitions between 193 and 443 K. At high temperature (T > 423 K) the plastic nature of the crystals was confirmed. Temperature-controlled X-ray diffraction reveals that the thermal expansion of the crystal structure is non homothetic in the (a,b) plane and along the c axis. The temperature dependence of the Raman spectra up to 443 K revealed specific reorientations and molecular displacements of the organic and inorganic components associated with the phase transitions. We aim to thermally stabilize the [(C2H5)4N]FeCl4 compound which has a band gap suitable for photocatalytic processes.

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Organic–inorganic interactions revealed by Raman spectroscopy during reversible phase transitions in semiconducting [(C2H5)4N]FeCl4

The compound, tetraethylammonium tetrachloroferrate [(C2H5)4N]FeCl4, was prepared by slow evaporation at room temperature. It was characterized by X-ray powder diffraction, thermal analysis, and impedance and vibrational spectroscopy. X-ray diffraction data confirmed formation of a single phase material which crystallized at room temperature in the hexagonal system (P63mc space group). DSC showed the existence of two phase transitions at 413 K and 430 K. Electrical conductivity was measured in the temperature and frequency ranges of 390 K to 440 K and 40 Hz to 110 MHz, respectively. Nyquist plots revealed the existence of grains and grain boundaries that were fitted to an equivalent circuit. AC conductivity plots were analyzed by Jonscher's power law. Variations in the “s” values indicated that CBH models describe the conduction mechanism in regions I and II. Temperature dependence of Raman spectra showed that the most important changes were observed in the cationic parts ([(C2H5)4N]+). The activation energy value obtained from the line width decreased which indicated an order–disorder model.

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Electrical conductivity and vibrational studies induced phase transitions in [(C2H5)4N]FeCl4

RETRACTED ARTICLE: Synthesis, structural, and ionic conductivity characterizations of new spinel material: LiCoNbO4

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Kh. Ben Brahim

Papers

Synthesis, structural characterization and electrical conduction mechanism of the new organic–inorganic complex: ([(C3H7)4N]FeCl4)

Electrical conductivity and vibrational studies induced phase transitions in [(C2H5)4N]FeCl4

RETRACTED ARTICLE: Synthesis, structural, and ionic conductivity characterizations of new spinel material: LiCoNbO4

Retraction Note to: Synthesis, structural, and ionic conductivity characterizations of new spinel material: LiCoNbO4