Non-ohmic conduction in sodium bismuth titanate: the influence of oxide-ion conduction

2020 ◽  
Vol 22 (36) ◽  
pp. 20941-20950
Author(s):  
F. Yang ◽  
A. R. West ◽  
D. C. Sinclair
Keyword(s):  
Bismuth Titanate ◽  
Critical Role ◽  
Ohmic Conduction ◽  
Conductivity Enhancement ◽  
Oxygen Ions ◽  
Maximum Conductivity ◽  
Dc Bias ◽  
Oxide Ion Conduction ◽  
Oxide Ion ◽  
Mobile Oxygen

A maximum conductivity enhancement of >2000% is achieved in Na0.5Bi0.51TiO3.015 under a small dc bias, in which the highly mobile oxygen ions and the electrode reactions play a critical role.

scholarly journals Identification of different oxygen species in oxide nanostructures with 17O solid-state NMR spectroscopy

2015 ◽  
Vol 1 (1) ◽  
pp. e1400133 ◽  
Author(s):  
Meng Wang ◽  
Xin-Ping Wu ◽  
Sujuan Zheng ◽  
Li Zhao ◽  
Lei Li ◽  
...  
Keyword(s):  
Active Sites ◽  
Density Functional ◽  
Strong Dependence ◽  
Critical Role ◽  
Oxygen Species ◽  
Structure Property ◽  
Diverse Range ◽  
Oxygen Ions ◽  
Surface Sites ◽  
Nanostructured Oxides

Nanostructured oxides find multiple uses in a diverse range of applications including catalysis, energy storage, and environmental management, their higher surface areas, and, in some cases, electronic properties resulting in different physical properties from their bulk counterparts. Developing structure-property relations for these materials requires a determination of surface and subsurface structure. Although microscopy plays a critical role owing to the fact that the volumes sampled by such techniques may not be representative of the whole sample, complementary characterization methods are urgently required. We develop a simple nuclear magnetic resonance (NMR) strategy to detect the first few layers of a nanomaterial, demonstrating the approach with technologically relevant ceria nanoparticles. We show that the 17O resonances arising from the first to third surface layer oxygen ions, hydroxyl sites, and oxygen species near vacancies can be distinguished from the oxygen ions in the bulk, with higher-frequency 17O chemical shifts being observed for the lower coordinated surface sites. H217O can be used to selectively enrich surface sites, allowing only these particular active sites to be monitored in a chemical process. 17O NMR spectra of thermally treated nanosized ceria clearly show how different oxygen species interconvert at elevated temperature. Density functional theory calculations confirm the assignments and reveal a strong dependence of chemical shift on the nature of the surface. These results open up new strategies for characterizing nanostructured oxides and their applications.

Oxide-ion conduction via interstitials in scheelite-type LaNbO4: a first-principles study

2018 ◽  
Vol 6 (25) ◽  
pp. 12004-12011 ◽  
Author(s):  
Kazuaki Toyoura ◽  
Yusuke Sakakibara ◽  
Tatsuya Yokoi ◽  
Atsutomo Nakamura ◽  
Katsuyuki Matsunaga
Keyword(s):  
First Principles ◽  
First Principles Calculations ◽  
Ion Conduction ◽  
First Principles Study ◽  
Oxide Ion Conduction ◽  
Oxide Ion

The interstitial oxide-ion mechanism in scheelite-type lanthanum niobate has theoretically been analyzed using first-principles calculations.

Experimental Investigations of Ni Nanoparticle-Polyurethane Acrylic Composite for Electrical Conductivity Enhancement

MRS Advances ◽  
2019 ◽  
Vol 4 (43) ◽  
pp. 2337-2344
Author(s):  
Adrian Goodwin ◽  
Ajit D. Kelkar ◽  
Ram V. Mohan
Keyword(s):  
Electrical Conductivity ◽  
Nickel Nanoparticles ◽  
Surface Concentration ◽  
Nano Particles ◽  
Experimental Investigations ◽  
Conductivity Measurements ◽  
Conductivity Enhancement ◽  
Conductive Composites ◽  
Maximum Conductivity ◽  
Number Of Particles

ABSTRACTConductive composites are being considered for use in applications such as electromagnetic shielding. Prior work has shown correlation of electrical conductivity to the microstructure of corresponding composite. In the present paper, composites consisting of polyurethane acrylic and dispersed nickel nanoparticles were fabricated, and tested for their electrical conductivity. In the fabrication process, half of the suspensions were agitated by sonication and half were not. Correlations between electrical conductivity and composite microstructural details are presented. These correlations show an optimum concentration of nickel nanoparticles that result in maximum conductivity enhancement. In addition, sonicating the suspensions increased conductivity of resulting nanocomposites. Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS) images were used to estimate surface concentration and distribution of Nickel nanoparticles, and were correlated to electrical conductivity measurements. Parameters such as number of particles in contact and junction distance between the nano particles in the composites are suggested as a way of enhancing electrical conductivity.

Defect Structure and Oxide-ion Conduction in (La, Sr)2NiO4+δ with Layered Perovskite Structure

2020 ◽  
Vol 49 (9) ◽  
pp. 1071-1074
Author(s):  
Naoto Kitamura ◽  
Kakeru Ishizaki ◽  
Naoya Ishida ◽  
Yasushi Idemoto
Keyword(s):  
Defect Structure ◽  
Perovskite Structure ◽  
Layered Perovskite ◽  
Ion Conduction ◽  
Layered Perovskite Structure ◽  
Oxide Ion Conduction ◽  
Oxide Ion

Oxide ion conduction in La-doped PbWO4single crystals

2003 ◽  
Vol 15 (33) ◽  
pp. 5689-5695 ◽  
Author(s):  
Hongwei Huang ◽  
Xiqi Feng ◽  
Wenliang Zhu ◽  
Yan Zhang ◽  
Ting-Lian Wen ◽  
...  
Keyword(s):  
Ion Conduction ◽  
Oxide Ion Conduction ◽  
La Doped ◽  
Oxide Ion

Oxide Ion Conduction in Indium-Oxide-Substituted Calcium Zirconate

2006 ◽  
Vol 153 (10) ◽  
pp. H189 ◽  
Author(s):  
M. P. Hills ◽  
C. Schwandt ◽  
R. V. Kumar
Keyword(s):  
Indium Oxide ◽  
Calcium Zirconate ◽  
Ion Conduction ◽  
Oxide Ion Conduction ◽  
Oxide Ion

Oxide ion conduction anisotropy deconvoluted in polycrystalline apatite-type lanthanum silicates

2011 ◽  
Vol 21 (9) ◽  
pp. 2940 ◽  
Author(s):  
Yong Kim ◽  
Dong-Kyu Shin ◽  
Eui-Chol Shin ◽  
Hyun-Ho Seo ◽  
Jong-Sook Lee
Keyword(s):  
Ion Conduction ◽  
Lanthanum Silicates ◽  
Oxide Ion Conduction ◽  
Oxide Ion ◽  
Apatite Type ◽  
Conduction Anisotropy

Fast oxide-ion conduction in intergrowth structures

1992 ◽  
Vol 52 (1-3) ◽  
pp. 105-109 ◽  
Author(s):  
J GOODENOUGH ◽  
A MANTHIRAM ◽  
P PARANTHAMAN ◽  
Y ZHEN
Keyword(s):  
Ion Conduction ◽  
Intergrowth Structures ◽  
Oxide Ion Conduction ◽  
Oxide Ion
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