Abstract
The permittivity and ac conductivity of the compound bis(methyltriphenylphosphonium) 2tetrachloro-manganate(II) have been measured in the temperature range 300–400 K and in the frequency range 0.1–20 kHz . Differential thermal analysis reveals structural phase transition in the temperature range 365 K< T<375 K. This is reflected as a plateau in the permittivity (at f>1 kHz) and the conductivity results. The conductivity follows the Arrhenius relation with different activation energies and conduction mechanisms: region (I) → 345±3 K region (II) → 365±3 K region (III) → 372±2 K region (IV) with activation energies Δ E 1∼10 meV, Δ E 2∼1–0.2 eV and Δ E 4∼2–1 eV for temperature regions (I), (II) and (IV), respectively. In region (I) extrinsic type conduction prevails. Analysis of the experimental data based on the jump relaxation model, showed that translation motion of the proton and reorientation hopping between equivalent sites of the metal chloride anion and the phenyl groups are responsible for the observed ac conductivity in the temperature region (II). In region (IV) overlap large polarons predominates .
Published Version
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