The Role of Noise in Determining Selective Ionic Conduction Through Nano-Pores

AbstractA theoretical model of microwave absorption in linear dielectric (non-ferroelectric) ionic crystals that takes into account the presence of point defects was synthesized and verified using NaCl single crystals. In the next stage of this research, we will introduce a controlled density of dislocations into the single crystal NaCl samples and study the effect on the microwave absorption mechanisms (ionic conduction, dielectric relaxation and multi-phonon processes) both theoretically and experimentally. Qualitative outlines of this modified theory are presented. The loss factor ε’ has been measured in the dislocation-free case by a cavity resonator insertion technique and the experimental results are in good agreement with the theoretical model. We describe the sample preparation technique that will be used to produce a controlled dislocation density in single crystal samples that will also be studied in our cavity resonator insertion system.

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Ruthenium Doped Gadolinium Titanate: Effects of a Variable Valent Acceptor on Ionic and Electronic Conduction

MRS Proceedings ◽

10.1557/proc-293-301 ◽

1992 ◽

Vol 293 ◽

Cited By ~ 1

Author(s):

M.A. Spears ◽

H.L. Tuller

Keyword(s):

Electrical Conductivity ◽

Thermoelectric Power ◽

Defect Structure ◽

Oxygen Vacancies ◽

Ionic Conduction ◽

Electronic Conductivity ◽

Electronic Conduction ◽

Defect Band ◽

Electron Migration

AbstractWe have investigated ruthenium doped gadolinium titanate, Gd2(RuxTi1-x)2O7-δ with 0 ≤ x ≤ 0.2, to determine the role of variable valent Ru in influencing the defect structure and transport properties of the pyrochlore host. We have developed a defect chemical model to interpret electrical conductivity, thermoelectric power, and thermogravimetry data. We have found that Ru acts as an acceptor compensated in large part by oxygen vacancies, resulting in enhanced ionic conduction at low values of x. For larger values (x ≈ 0.05), electronic conductivity predominates which we attribute to electron migration by hopping through a Ru-derived defect band.

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Partial electronic and ionic conduction in nanocrystalline ceria: role of space charge

Journal of the European Ceramic Society ◽

10.1016/s0955-2219(03)00525-9 ◽

2004 ◽

Vol 24 (6) ◽

pp. 1919-1923 ◽

Cited By ~ 35

Author(s):

Sangtae Kim ◽

Joachim Maier

Keyword(s):

Space Charge ◽

Ionic Conduction ◽

Nanocrystalline Ceria

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The fate of aluminium in (Na,Bi)TiO3-based ionic conductors

Journal of Materials Chemistry A ◽

10.1039/d0ta03554h ◽

2020 ◽

Vol 8 (35) ◽

pp. 18188-18197

Author(s):

Pedro B. Groszewicz ◽

Leonie Koch ◽

Sebastian Steiner ◽

Azatuhi Ayrikyan ◽

Kyle G. Webber ◽

...

Keyword(s):

Nmr Spectroscopy ◽

Dft Calculations ◽

Ionic Conduction ◽

Impedance Analysis ◽

Ionic Conductors

The role of [AlTi–VO]˙ associated defects in ionic conduction in Al-doped (Na,Bi)TiO3 is clarified by a combination of impedance analysis, DFT calculations and NMR spectroscopy.

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The role of electronic and ionic conduction in the electrical conductivity of carbon fiber reinforced cement

Carbon ◽

10.1016/j.carbon.2006.03.013 ◽

2006 ◽

Vol 44 (11) ◽

pp. 2130-2138 ◽

Cited By ~ 66

Author(s):

Sihai Wen ◽

D.D.L. Chung

Keyword(s):

Electrical Conductivity ◽

Carbon Fiber ◽

Ionic Conduction ◽

Fiber Reinforced ◽

Reinforced Cement ◽

Carbon Fiber Reinforced

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Bonding character and ionic conduction in solid electrolytes

Pure and Applied Chemistry ◽

10.1515/pac-2018-1220 ◽

2019 ◽

Vol 91 (11) ◽

pp. 1797-1806

Author(s):

Masaru Aniya

Keyword(s):

Ionic Conductivity ◽

Ionic Conduction ◽

Superionic Conductors ◽

Ionic Conductors ◽

Different Types ◽

Medium Range ◽

The Subject ◽

Bond Fluctuation ◽

Fluctuation Model

Abstract The properties of the materials are intimately related to the nature of the chemical bond. Research to explain the peculiarities of superionic materials by focusing on the bonding character of the materials is presented. In particular, a brief review of some fundamental aspects of superionic conductors is given based on the talk presented at “Solid State Chemistry 2018, Pardubice” in addition to some new results related to the subject. Specifically, the topics on bond fluctuation model of ionic conductors, the role of medium range structure in the ionic conductivity, bonding aspects of non-Arrhenius ionic conductivity and elastic properties of ionic conductors are discussed. Key concepts that are gained from these studies is stressed, such as the importance of the coexistence of different types of bonding, and the role of medium range structure in glasses for efficient ionic transport in solids. These concepts could help the development of new materials.

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