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Добірка наукової літератури з теми "Oxygen Ion Conductors - Relaxation Dynamics"

Автор: Grafiati
Опубліковано: 7 вересня 2023

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Статті в журналах з теми "Oxygen Ion Conductors - Relaxation Dynamics"

1

Li, Dan, Bo Wang, Pei Gong, Jie Li та Xiang Hu Li. "Dielectric Relaxation Measurements in La1.94Ba0.06Mo2-yWyO9-δ (y=0, 1.0) Oxide-Ion Conductors". Applied Mechanics and Materials 662 (жовтень 2014): 20–23. http://dx.doi.org/10.4028/www.scientific.net/amm.662.20.

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Анотація:
The influence of barium doping on the oxygen-ion diffusion and phase transition in the La2Mo2-yWyO9-δ (y=0, 1.0) oxide-ion conductors has been systematically investigated via dielectric techniques. In the Ba-doped La2Mo2O9 samples there are only two dielectric relaxation peaks Pd1 and Pd2, which are associated with the short-distance diffusion of oxygen vacancies. But in the Ba-doped La2MoWO9 members, three peaks are detected, including peak Pd1, Pd2, and peak Ph. The last is associated with the phase transition process from the static disordered state to the dynamic disordered state of oxygen ion/vacancy distribution.
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2

Wang, X. P., J. Hu, Zhong Zhuang, Tao Zhang та Qian Feng Fang. "Internal Friction Study of the Rare Earth Ion Substituted Fast Oxide-Ion Conductors (La1-ΧreΧ)2Mo2O9 (Re=Nd, Gd)". Solid State Phenomena 184 (січень 2012): 110–15. http://dx.doi.org/10.4028/www.scientific.net/ssp.184.110.

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Анотація:
The relaxation and phase transition behaviors of rare-earth ion substituted fast oxide-ion conductors (La1-xRex)2Mo2O9 (Re=Nd, Gd) were investigated by internal friction (IF) measurement in the temperature range 300 K - 950 K. Three different IF peaks (labeled as PL, PH, and PG, respectively) were observed in the rare-earth ion doped La2Mo2O9 samples. Peak PL corresponds to short diffusion processes of oxygen ions among different oxygen vacancy sites. Peak PH is associated with the static/dynamic disorder transition in oxygen ion distribution. Peak PG is a newly discovered peak embodying phase transition-like characteristics and is suggested to be related to order-disorder transition associated with the rearrangement of La/ Re sub-lattice.
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3

Li, Dan, and Xiang Hu Li. "Influence of Tungsten Doping in La2Mo2O9 Oxide-Ion Conductors by Dielectric Relaxation Measurements." Applied Mechanics and Materials 130-134 (October 2011): 3302–5. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.3302.

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The effects of tungsten doping in La2Mo2–yWyO9 (y =0, 0.25, 0.5, 1.0, 1.4) samples were studied using dielectric relaxation measurements. The results indicate that the solubility of W6+ in La2Mo2O9 sample is about 25mol%, W6+ can suppress the α/β phase transition in the La2Mo2O9. Additional to the low-temperature relaxation peak Pd associated with oxygen ion diffusion, a new dielectric loss peak Ph associated with a phase transition from the static disordered state to the dynamic disordered state of oxygen ion distribution was observed around 740 K. The conductivity of La2Mo1.9W0.1O9 sample is higher than that of the pure La2Mo2O9, and then decrease with the increasing of the tungsten doping in La2Mo2–yWyO9 (y = 0.5, 1.0) samples in the whole measurement temperature.
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4

Li, Dan, Jun Li, Chong Chen, Lin Qi, and Xiang Hu Li. "Dielectric Relaxation Measurements in La2Mo1.5W0.5O9 Oxide-Ion Conductor." Advanced Materials Research 952 (May 2014): 51–54. http://dx.doi.org/10.4028/www.scientific.net/amr.952.51.

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Анотація:
The effects of tungsten doping in La2Mo1.5W0.5O9 sample were studied using dielectric relaxation measurements. The results indicate that W6+ can suppress the α/β phase transition in the La2Mo2O9. Additional to the low-temperature relaxation peak Pd associated with oxygen ion diffusion, a new dielectric loss peak Ph associated with a phase transition from the static disordered state to the dynamic disordered state of oxygen ion distribution was observed around 740 K.
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5

Fang, Q. F., X. P. Wang, Z. S. Li, G. G. Zhang, and Z. G. Yi. "Relaxation peaks associated with the oxygen-ion diffusion in La2−xBixMo2O9 oxide-ion conductors." Materials Science and Engineering: A 370, no. 1-2 (April 2004): 365–69. http://dx.doi.org/10.1016/j.msea.2003.02.004.

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6

KILO, M. "Modeling of cation diffusion in oxygen ion conductors using molecular dynamics." Solid State Ionics 175, no. 1-4 (November 2004): 823–27. http://dx.doi.org/10.1016/j.ssi.2004.09.059.

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7

Frechero, M. A., O. J. Durá, M. R. Díaz-Guillén, K. J. Moreno, J. A. Díaz-Guillén, J. García-Barriocanal, A. Rivera-Calzada, A. F. Fuentes, and C. León. "Oxygen ion dynamics in pyrochlore-type ionic conductors: Effects of structure and ion–ion cooperativity." Journal of Non-Crystalline Solids 407 (January 2015): 349–54. http://dx.doi.org/10.1016/j.jnoncrysol.2014.08.046.

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8

Nowick, A. "Exploring the low-temperature electrical relaxation of crystalline oxygen-ion and protonic conductors." Solid State Ionics 136-137, no. 1-2 (November 2, 2000): 1307–14. http://dx.doi.org/10.1016/s0167-2738(00)00603-2.

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9

Fang, Qian Feng, X. P. Wang, Z. G. Yi, and Z. J. Cheng. "Relaxation Effects in La2Mo2O9-Based Oxide-Ion Conductors." Solid State Phenomena 115 (August 2006): 193–202. http://dx.doi.org/10.4028/www.scientific.net/ssp.115.193.

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Анотація:
The novel oxide-ion conductors (La1-xAx)2Mo2O9-δ (A = Ca, Bi, K, x = 0 ~ 0.075) are investigated in this paper by internal friction and dielectric relaxation techniques. Two relaxation peaks associated with the short-distance diffusion of oxygen vacancies were observed, indicating that there are at least two relaxation processes for diffusion of oxygen vacancies. Doping at La site with different elements shifts both relaxation peaks toward higher temperature and increases the activation energy of oxygen vacancy diffusion. In the case of internal friction, the height of the higher-temperature peak (dominant component) decreases with increasing doping content. In the case of dielectric relaxation, however, the variation of the peak heights as a function of doping content exhibits a maximum around 2.5 % K and 5 % Bi. After properly doping, the conductivity at low temperature of doped La2Mo2O9 increases by different degrees, and a peak of the conductivity at 500° C is observed in the doping content where the highest dielectric relaxation peak appears. Based on the experimental results and the crystalline structure, the mechanism of oxygen vacancy diffusion in (La1-xAx)2Mo2O9-δ samples is discussed.
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10

Anirban, Sk, and Abhigyan Dutta. "Dielectric relaxation and charge carrier mechanism in nanocrystalline Ce–Dy ionic conductors." RSC Advances 6, no. 55 (2016): 49852–61. http://dx.doi.org/10.1039/c6ra06654b.

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Частини книг з теми "Oxygen Ion Conductors - Relaxation Dynamics"

1

Nitzan, Abraham. "Electron Transfer and Transmission at Molecule–Metal and Molecule–Semiconductor Interfaces." In Chemical Dynamics in Condensed Phases. Oxford University Press, 2006. http://dx.doi.org/10.1093/oso/9780198529798.003.0024.

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Анотація:
This chapter continues our discussion of electron transfer processes, now focusing on the interface between molecular systems and solid conductors. Interest in such processes has recently surged within the emerging field of molecular electronics, itself part of a general multidisciplinary effort on nanotechnology. Notwithstanding new concepts, new experimental and theoretical methods, and new terminology, the start of this interest dates back to the early days of electrochemistry, marked by the famous experiments of Galvani and Volta in the late eighteenth century. The first part of this chapter discusses electron transfer in what might now be called “traditional” electrochemistry where the fundamental process is electron transfer between a molecule or a molecular ion and a metal electrode. The second part constitutes an introduction to molecular electronics, focusing on the problem of molecular conduction, which is essentially electron transfer (in this context better termed electron transmission) between two metal electrodes through a molecular layer or sometimes even a single molecule. In Chapter 16 we have focused on electron transfer processes of the following characteristics: (1) Two electronic states, one associated with the donor species, the other with the acceptor, are involved. (2) Energetics is determined by the electronic energies of the donor and acceptor states and by the electrostatic solvation of the initial and final charge distributions in their electronic and nuclear environments. (3) The energy barrier to the transfer process originates from the fact that electronic and nuclear motions occur on vastly different timescales. (4) Irreversibility is driven by nuclear relaxation about the initial and final electronic charge distributions. How will this change if one of the two electronic species is replaced by a metal? We can imagine an electron transfer process between a metal substrate and a molecule adsorbed on its surface, however the most common process of this kind takes place at the interface between a metal electrode and an electrolyte solution, where the molecular species is an ion residing in the electrolyte, near the metal surface. Electron transfer in this configuration is the fundamental process of electrochemistry.
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Тези доповідей конференцій з теми "Oxygen Ion Conductors - Relaxation Dynamics"

1

Anirban, Sk, and A. Dutta. "Charge carrier dynamics in nanocrystalline Dy substituted ceria based oxygen ion conductors." In INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC 2015): Proceeding of International Conference on Condensed Matter and Applied Physics. Author(s), 2016. http://dx.doi.org/10.1063/1.4946121.

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