Complex impedance spectra of [(C2H5)4N]FeCl4 at different temperature.

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The alkylammonium halogenoferrate families are subjected to diverse studies according to their wide field application.

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The present paper accounts for the synthesis, crystal structure, differential scanning calorimetry, vibrational study, and electrical properties of the [N(C 3 H 7 ) 4 ] 2 Zn 2 Cl 6 compound. The latter is crystallized at room temperature in the triclinic system (P1 space group) with the following unit cell parameters: a=13.736(2)Å, b=17.044(3)Å, c=17.334(2)Å, α=68.30(2)°, β=75.14(2)°, and γ=84.93(3). The atomic arrangement can be described by alternating organic and inorganic layers parallel to the (001) plan, made up of [N(C 3 H 7 ) 4 ] + groups and [Zn 2 Cl 6 ] 2− dimers, respectively. In crystal structure, the inorganic layer, built up by Zn 2 Cl 6 dimers, is connected to the organic ones through van der Waals interaction in order to build cation-anion-cation cohesion. The infrared and Raman studies confirm the presence of the organic group tetrapropylammonium and the Zn 2 Cl 6 anion. Concerning the differential scanning calorimetry, it revealed two reversible solid-solid phase transitions of first order: at 327/324 K and 347/343 K (heating/cooling). Besides, the impedance spectroscopy study, reported in the sample, reveals that the conduction in the material is due to a hopping process. Regarding the temperature dependence of the dc conductivity, it suggests Arrhenius type: σ dc T=B exp(−E a /kT). The tetrapropylammonium cations appeared to be the most sensitive to the phase transition.

We used the solid state method to synthesize the α-KZnPO4 compound.