Dynamic Heterogeneity and Ionic Conduction in an Organic Ionic Plastic Crystal and the Role of Vacancies

2013 ◽  
Vol 4 (23) ◽  
pp. 4085-4089 ◽  
Author(s):  
Fangfang Chen ◽  
Simon W. de Leeuw ◽  
Maria Forsyth
Keyword(s):  
Ionic Conduction ◽  
Plastic Crystal ◽  
Dynamic Heterogeneity

Role of Defects in the High Ionic Conductivity of Choline Triflate Plastic Crystal and Its Acid-Containing Compositions

2013 ◽  
Vol 117 (11) ◽  
pp. 5532-5543 ◽  
Author(s):  
Usman Ali Rana ◽  
R. Vijayaraghavan ◽  
Cara M. Doherty ◽  
Amreesh Chandra ◽  
Jim Efthimiadis ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
High Ionic Conductivity ◽  
Plastic Crystal

Investigations of Microwave Absorption in Insulating Dielectric Ionic Crystals Including the Role of Point Defects and Dislocations

1996 ◽  
Vol 430 ◽  
Author(s):  
Benjamin D.B. Klein ◽  
Binshen Meng ◽  
Samuel A. Freeman ◽  
John H. Booske ◽  
Reid F. Cooper
Keyword(s):  
Theoretical Model ◽  
Single Crystal ◽  
Microwave Absorption ◽  
Point Defects ◽  
Ionic Conduction ◽  
Cavity Resonator ◽  
Preparation Technique ◽  
Ionic Crystals ◽  
Free Case

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.

Interfacial Properties of Polymer Nanocomposites: Role of Chain Rigidity and Dynamic Heterogeneity Length Scale

2017 ◽  
Vol 50 (6) ◽  
pp. 2397-2406 ◽  
Author(s):  
Shiwang Cheng ◽  
Bobby Carroll ◽  
Wei Lu ◽  
Fei Fan ◽  
Jan-Michael Y. Carrillo ◽  
...  
Keyword(s):  
Polymer Nanocomposites ◽  
Interfacial Properties ◽  
Length Scale ◽  
Dynamic Heterogeneity ◽  
Chain Rigidity

scholarly journals Assessing the role of static length scales behind glassy dynamics in polydisperse hard disks

2015 ◽  
Vol 112 (22) ◽  
pp. 6920-6924 ◽  
Author(s):  
John Russo ◽  
Hajime Tanaka
Keyword(s):  
Correlation Length ◽  
Hard Disk ◽  
Decay Length ◽  
Hard Disks ◽  
Dynamic Heterogeneity ◽  
Disk System ◽  
Slowing Down ◽  
Static Correlation ◽  
Dynamic Length

The possible role of growing static order in the dynamical slowing down toward the glass transition has recently attracted considerable attention. On the basis of random first-order transition theory, a new method to measure the static correlation length of amorphous order, called “point-to-set” (PTS) length, has been proposed and used to show that the dynamic length grows much faster than the static length. Here, we study the nature of the PTS length, using a polydisperse hard-disk system, which is a model that is known to exhibit a growing hexatic order upon densification. We show that the PTS correlation length is decoupled from the steeper increase of the correlation length of hexatic order and dynamic heterogeneity, while closely mirroring the decay length of two-body density correlations. Our results thus provide a clear example that other forms of order can play an important role in the slowing down of the dynamics, casting a serious doubt on the order-agnostic nature of the PTS length and its relevance to slow dynamics, provided that a polydisperse hard-disk system is a typical glass former.

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

1992 ◽  
Vol 293 ◽  
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.

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

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.

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

2018 ◽  
Author(s):  
W.A.T. Gibby ◽  
M.L. Barabash ◽  
C. Guardiani ◽  
D.G. Luchinsky ◽  
P.V.E. McClintock
Keyword(s):  
Ionic Conduction
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