Defect interaction and solid electrolyte transition in AgI-based materials

Burbano, J.C.; Vargas, R.A.; Lara, D. Peña; Z., C.A. Lozano; Correa, H.

doi:10.1016/j.ssi.2009.10.016

Cited by 10 publications

(8 citation statements)

References 7 publications

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“…23 and 0.39 eV, respectively; these values are close to those reported by Al-Kassab et al [7]. The energy values obtained are associated with energy required for promoting an H+ to an empty lattice site explained by a similar mechanism for ionic conduction as that proposed by Vargas et al in AgI-based materials [39,40].…”

Section: Resultssupporting

confidence: 88%

Phase behaviour and superionic phase transition in K3H(SeO4)2

Hernández-Daguer

Correa

Vargas

2015

Ionics

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The phase behaviour of K 3 H(SeO 4 ) 2 (TKHSe) above room temperature has been studied by differential scanning calorimetric (DSC), thermogravimetric analysis (TGA), simultaneous thermogravimetric and mass spectroscopy analysis (TG-MS), impedance spectroscopy (IS) and X-ray powder diffraction (XRD). Our results show that the previously claimed superionic phase transition in TKHSe at around 388 K (114.85°C) is also the onset temperature of a slow thermal dehydration that occurs at reaction sites distributed over the surface of the crystal. That is, we propose that the TKHSe undergoes simultaneously a superionic phase transition and a decomposition process with a very slow reaction rate that is evident when the sample is pulverized to fine powder, both starting at the same temperature. As a matter of fact, we observe a decrease of the magnitude of the dcconductivity on successive thermal runs in powdered sample attributed to sample decomposition that starts at the surface of the TKHSe grains, but the jump in conductivity is only a consequence of the order-disorder transition in the TKHSe phase that remains inside the grains.

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Section: Resultssupporting

confidence: 88%

Phase behaviour and superionic phase transition in K3H(SeO4)2

Hernández-Daguer

Correa

Vargas

2015

Ionics

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“…In order to explain both conductivity σ(T) behavior and its abrupt jump (first-order phase transition), we note that only some ionic carriers participate before the transition. This phenomenology is described in [33,34]. Interpreting η i as charge carriers, the participation of the carriers is described by the following probability distribution function:…”

Section: Phenomenological Modelmentioning

confidence: 99%

“…where Γ, τ, χ and p are four fitting parameters. Equation ( 7) was used to fit the AgI-KI [34] and (AgI) (1−x) -(Al 2 O 3 ) x nanocomposite systems [35]. At the transition temperature T t (∼ 1/τ t ) has two inflection points where its second derivative with respect to η is zero at η 1 , η 2 (η 1 ̸ = η 2 are local minima) and has a local maximum at η = 1/(2p).…”

Section: Phenomenological Modelmentioning

confidence: 99%

Phases Transition in Carbon-doped Silver Iodide

Correa¹,

Lara²,

Mosquera³

2022

Preprint

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Silver iodide (AgI) is a system prototype allowing the flow of ions through its structure and has a phase transition at 420 K, characterized by an abrupt change in conductivity and a high ionic conductivity. Introducing low concentrations of graphite (C) into the AgI structure produces a new material with a mixed conductivity (ionic and electronic) which increases with increasing temperature. The experimental results of the logarithm of the ionic conductivity as a function of the inverse of temperature for the (AgI)x–C(1−x) system for low carbon concentrations 0.97 ≤ x ≤ 0.99 were well fitted using a phenomenological model with a probability distribution for the charge carriers based on the carrier density

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“…the to -phase transition in AgI based ionic conductivity [17]). As pointed out in the new temperature phase the DC conductivity increases in a thermally activated way, while above T t is almost constant.…”

Section: Phase Transitions 919mentioning

confidence: 99%

Proton conduction in the binary system (1 − x)CsHSeO₄–xKHSeO₄studied with a free-energy model

et al. 2011

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Electrical Impedance Spectroscopy (EIS) was used to study the electrical properties of the (1 À x)CsHSeO 4 -xKHSeO 4 binary system with concentrations x ¼ 0.0 and 0.1. The results show a higher proton-conduction phase above 80 C for both concentrations, however, while DC conductivity of CsHSeO 4 shows a gradual change to higher values in the 80-118 C temperature range, the 0.9CsHSeO 4 -0.1KHSeO 4 concentration reveals an abrupt change at about 80 C to an intermediate temperature phase. The observed behavior for the doped sample was modeled using a trial free-energy density, based on the concentration of mobile ions, that takes into account the formation of defects, configurational and phonon entropies, and defect-defect interactions. By minimising the free-energy density one obtains two roots for the carrier concentration at a given temperature, which corresponds to a stable and metastable configuration. It is possible to characterise the phase behavior of the system by means of temperature and two model parameters, which depend on the crystalline properties of the system, but not on temperature. One can successfully explain the conductivity behavior of the system by changing the model parameters if it is assumed that its variations are due to the carriers density.

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Defect interaction and solid electrolyte transition in AgI-based materials

Cited by 10 publications

References 7 publications

Phase behaviour and superionic phase transition in K3H(SeO4)2

Phase behaviour and superionic phase transition in K3H(SeO4)2

Phases Transition in Carbon-doped Silver Iodide

Proton conduction in the binary system (1 − x)CsHSeO₄–xKHSeO₄studied with a free-energy model

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Defect interaction and solid electrolyte transition in AgI-based materials

Cited by 10 publications

References 7 publications

Phase behaviour and superionic phase transition in K3H(SeO4)2

Phase behaviour and superionic phase transition in K3H(SeO4)2

Phases Transition in Carbon-doped Silver Iodide

Proton conduction in the binary system (1 − x)CsHSeO4–xKHSeO4studied with a free-energy model

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Proton conduction in the binary system (1 − x)CsHSeO₄–xKHSeO₄studied with a free-energy model