Mechanism of ac and dc conduction in chalcogenide glasses

Abdel-Wahab, F.; Montaser, A. A.; Yelon, A.

doi:10.1007/s00706-012-0829-y

Cited by 14 publications

(4 citation statements)

References 30 publications

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“…For instance, in chemical thermodynamics it has been found an enthalpy–entropy compensation effect for the temperature dependence of the equilibrium constants corresponding to many homologous reaction series (isoequilibrium relationship) . In addition, similar compensation effects have been reported for a wide range of phenomena including those such as heating-induced changes in food chemistry, protein folding/unfolding and ligand binding/unbinding in biochemistry, as well as polymer relaxation, thermal electron emission from semiconductor traps and electron conduction in chalcogenide glasses in physics. Precisely, this ubiquitous character of the compensation effect makes it important as an objective of research.…”

Section: Introductionmentioning

confidence: 73%

Enthalpy–Entropy Compensation Effect in Chemical Kinetics and Experimental Errors: A Numerical Simulation Approach

Perez‐Benito

Mulero-Raichs

2016

J. Phys. Chem. A

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Many kinetic studies concerning homologous reaction series report the existence of an activation enthalpy-entropy linear correlation (compensation plot), its slope being the temperature at which all the members of the series have the same rate constant (isokinetic temperature). Unfortunately, it has been demonstrated by statistical methods that the experimental errors associated with the activation enthalpy and entropy are mutually interdependent. Therefore, the possibility that some of those correlations might be caused by accidental errors has been explored by numerical simulations. As a result of this study, a computer program has been developed to evaluate the probability that experimental errors might lead to a linear compensation plot parting from an initial randomly scattered set of activation parameters (p-test). Application of this program to kinetic data for 100 homologous reaction series extracted from bibliographic sources has allowed concluding that most of the reported compensation plots can hardly be explained by the accumulation of experimental errors, thus requiring the existence of a previously existing, physically meaningful correlation.

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Section: Introductionmentioning

confidence: 73%

Enthalpy–Entropy Compensation Effect in Chemical Kinetics and Experimental Errors: A Numerical Simulation Approach

Perez‐Benito

Mulero-Raichs

2016

J. Phys. Chem. A

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“…The CBH model reproduces charge transport in amorphous chalcogenides quite well. In particular, the form which incorporates MNR permits fitting of the temperature dependence of ac conductivity over a wide range, [45] fitting the frequency dependence of AC conduction, [48] and describing AC and DC conductivity with the same parameters, [50] It also predicts that the isokinetic and high field, 'Poole-Frenkel' temperatures should be the same, as observed in one case. [34] But the form used for the chalcogenides is clearly in contradiction with the observation of a linear dependence of the hole conductivity in perovskites in so far as the hole concentration, n, is determined by the doping fraction, x.…”

Section: Typementioning

confidence: 95%

Hole and Protonic Polarons in Perovskites

Braun

Chen

Yelon

2019

Chimia

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Electric charge transport is an essential process for all electrical and electrochemical energy systems, including inanimate and animate matter. In this issue on materials for energy conversion, we compare and discuss the role of electron holes and protons as charge carriers in solids. Specifically we outline how the temperature or thermal bath affect the charge carrier concentration and mobility for some metal oxides with the perovskite structure. The frequent observation that the conductivity becomes independent of the activation energy at the isokinetic temperature, known as the Meyer-Neldel rule, is an important aspect of our interpretation of the physical mechanism of conduction by polaron hopping.

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“…6 correspond to s = 1 (best fit for s = 0.96), and are independent of T . In typical amorphous networks, for example, in chalcogenides, 34,49–51 s = 1 at low T , and decreases with increasing T , so that σ ac increases, joining the Arrhenius line for σ dc .…”

Section: Resultsmentioning

confidence: 99%

“…This was particularly fruitful when predictions of the correlated barrier hopping (CBH) model were compared with experiments on amorphous chalcogenides. 34,[49][50][51] The polaronic conduction in chalcogenide glasses was successfully described through including the MNR in the activated form in the relaxation time.…”

Section: Discussionmentioning

confidence: 99%