Organic-inorganic interactions revealed by Raman spectroscopy during reversible phase transitions in semiconducting [(CH)N]FeCl.

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 [(CH)N]FeCl compound was successfully synthesized using a slow evaporation solution growth method at room temperature.

Investigation of optical and electrical properties of the semiconducting α-KZnPO compound.

We used the solid state method to synthesize the α-KZnPO compound. The X-ray diffraction pattern revealed that the sample represents a single hexagonal phase with a 6 space group. The chemical composition of the compound was examined by energy dispersive spectroscopy.

Electrical conductivity and vibrational studies induced phase transitions in [(CH)N]FeCl.

The compound, tetraethylammonium tetrachloroferrate [(CH)N]FeCl, 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 (6 space group).

Using Raman spectroscopy to understand the origin of the phase transitions observed in [(C₃H₇)₄N]₂Zn₂Cl₆ compound.

Phase transitions of the centrosymmetric compound, [(C3H7)4N]2Zn2Cl6, were studied by differential scanning calorimetry (DSC), X-ray diffraction, Raman spectroscopy and dielectric measurements. Two reversible order-disorder and displacive phase transitions are observed at T1=327K and T2=347K with 3K and 4K hysteresis respectively, indicating a first order character. The evolution of Raman line shifts, "ν", and the half-width, "Δν", versus temperature show some singularities associated with the transitions, suggesting that they are governed by the reorientational and the displacement of the organic part.