NDLI: Using thin films to investigate heterogeneous defect chemistry

Content Provider	Springer Nature Link
Author	Shen, Weida Jiang, Jun Hertz, Joshua L.
Copyright Year	2014
Abstract	Prof. Nowick showed that the controlling mechanism of ion conduction in traditional solid electrolytes can be effectively summarized with a model built on defect chemistry within an infinite crystalline lattice. A common assumption in these models has been that, at least at low concentrations, dopants are randomly scattered within their particular sublattice. More recently, experimental tools have established means to create mesoscale compositional heterogeneity. This capability allows significant extension of the experimental space beyond what can be captured with the traditional models. Here, we survey recent experimentation that uses a sputtering technique to create films with composition Ce$_{1-x-z }$Zr$_{ x }$D$_{ z }$O$_{2-z/2}$ (D=Y, Gd, or La) where x or z can vary through the thickness of the film at the single nanometer level. These films are used to study 1) the effect of lattice mismatch strain by modulating the Ce/Zr ratio in multilayers and 2) the effects of vacancies being trapped within planar space charge regions by locating the dopant atoms as 2-D sheets within otherwise pure CeO$_{2}$ films. The films are likely to be metastable, but maintain compositional heterogeneity over experimental time scales. Current results and future possibilities for this technique are discussed.
Starting Page	74
Ending Page	81
Page Count	8
File Format	PDF
ISSN	13853449
Journal	Journal of Electroceramics
Volume Number	34
Issue Number	1
e-ISSN	15738663
Language	English
Publisher	Springer US
Publisher Date	2014-05-25
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Thin films Strain Space charge Interfaces Optical and Electronic Materials Ceramics, Glass, Composites, Natural Methods Characterization and Evaluation of Materials Electrochemistry Crystallography
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Materials Chemistry Mechanics of Materials Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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