THERMAL AND ELECTRICAL BEHAVIOUR OF THE SUPERPROTONIC CONDUCTOR PHASE IN Rb2(HSeO4)1.5(H2AsO4)0.5
Journal Title: JOURNAL OF ADVANCES IN CHEMISTRY - Year 2014, Vol 10, Issue 7
Abstract
Crystals of a new compound with a superprotonic phase transition Rb2(HSeO4)1.5(H2AsO4)0.5 (noted RbHSeAs), were synthesized by slow evaporation of an aqueous solution at room temperature. The differential scanning calorimetric analyses showed two endothermic peaks at 465 K and 566 K. The last peak corresponds to the decomposition of the material. The first transition was characterized by several techniques (impedance spectroscopy, complex modulus, Raman and X-ray diffraction powder depending on temperature). ac impedance measurements revealed that, upon heating, the compound undergoes at ~ 443 K a sharp increase in conductivity from a low temperature protonic phase to a superprotonic conductivity phase. The activation energies calculated from the modulus (ï„Ef) and impedance (ï„Eï³) spectra respectively are approximately equal, suggesting that the transport properties in this material above and below the superprotonic phase transition (443 K) are probably due to an H+ protons hopping mechanism.
Authors and Affiliations
Noura NOUIRI, Khaled JAOUADI, Tahar MHIRI
Keywords
Related Articles
- EP ID EP652801
- DOI 10.24297/jac.v10i7.6810
- Views 144
- Downloads 0
Optimization of 6-Gingerol Extraction Assisted by Microwave From Fresh Ginger Using Response Surface Methodology
The present study investigates optimum conditions for Microwave assisted extraction (MAE) of 6-gingerol. Ginger was dried using a cross flow dryer at 55 ± 2 0C for eight hours. Ginger powder was extracted at three differ...
ON CERTAIN TOPOLOGICAL INDICES OF BENZENOID COMPOUNDS
Drug discovery is mainly the result of chance discovery and massive screening of large corporate libraries of synthesized or naturally-occurring compounds. Computer aided drug design is an approach to rational drug desig...
The Kirkwood Superposition Approximation, Revisited and reexamined
The Kirkwood superposition approximation (KSA) was originally suggested to obtain a closure to an integral equation for the pair correlation function. It states that the potential of mean force of say, three particles ma...
Thermal stability of N-(a ±-amino-dodecyl)-benzotriazole
N-(α-amino-alkyl)-benzotriazole, a derivative of Benzotriazole (BTZ), was synthesized via a Mannich reaction addition. The chemical characterization shows that when C19H32N4supramolecule is subjected to heating process...
Decolorization and Biodegradation of basic violet dye by fungal- bacterial consortia
The present study was aimed to test the ability of Penicillium citrinum MTCC 8009, Aspergillusterreus MTCC 3006, Bacillus cohnii and their consortia to decolorize basic violet dye. Different parameters such as initial dy...