Effect of micro- and nano-structures on the properties of ionic conductors

Badwal, S. P. S.; Rajendran, S.

doi:10.1016/0167-2738(94)90291-7

Cited by 65 publications

(28 citation statements)

References 15 publications

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“…This may affect the conductivity of materials with the high interface density. The ionic transport at interfaces can be blocked by the segregation of impurities, reducing the total conductivity by several orders of magnitude, as in the case of SiO 2 segregation at the grain boundaries of doped zirconia oxygen-ion conductors [7][8][9]. In contrast, faster ionic transport was observed along interfaces between two different phases, as for ionic conductors heterogeneously doped with an insulator (e.g.…”

Section: Introductionmentioning

confidence: 92%

Ionic conductivity in oxide heterostructures: the role of interfaces

Fabbri

Pergolesi

Traversa

2010

Science and Technology of Advanced Materials

154

120

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Rapidly growing attention is being directed to the investigation of ionic conductivity in oxide film heterostructures. The main reason for this interest arises from interfacial phenomena in these heterostructures and their applications. Recent results revealed that heterophase interfaces have faster ionic conduction pathways than the bulk or homophase interfaces. This finding can open attractive opportunities in the field of micro-ionic devices. The influence of the interfaces on the conduction properties of heterostructures is becoming increasingly important with the miniaturization of solid-state devices, which leads to an enhanced interface density at the expense of the bulk. This review aims to describe the main evidence of interfacial phenomena in ion-conducting film heterostructures, highlighting the fundamental and technological relevance and offering guidelines to understanding the interface conduction mechanisms in these structures.

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Section: Introductionmentioning

confidence: 92%

Ionic conductivity in oxide heterostructures: the role of interfaces

Fabbri

Pergolesi

Traversa

2010

Science and Technology of Advanced Materials

154

120

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“…The early studies were restricted to measurements on State Ionics 177 (2006) 3001-3008 single crystals, however this was very restricting in terms of the materials that could be investigated. Impedance spectroscopy is the measurement of the complex impedance over a wide range of A.C. frequency and is an important tool to study diffusion in solids [68][69][70][71]. The advantage of this technique is that it can be used to study polycrystalline and compacted samples and it can deconvolute the contributions from the different structural components of the sample like bulk material or grain boundaries.…”

Section: Ion Transport Invstigationmentioning

confidence: 99%

Structure and dynamics in nanoionic materials

Chadwick

Savin

2006

Solid State Ionics

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Nanomaterials, materials with particle dimensions less than 100 nm, show a range of unusual properties when compared with their bulk counterparts. Atomic transport is one of these properties and nanomaterials have been reported as having exceptionally high diffusion coefficients. In the case of ionic materials the atomic transport is important in a number of technological applications where they are used as solid electrolytes, for example in sensors, batteries and fuel cells. Hence ionic nanomaterials often referred to as nanoionics, can offer the means of producing electrolytes with improved performance. This contribution will examine the mechanisms of atomic transport in nanoionics in two model materials, zirconia and lithium niobate. Since an understanding of these mechanisms is dependent on knowledge of the microstructure of the materials consideration will also be given to the structural characterisation of the materials, with a focus on X-ray absorption spectroscopy. The use of this technique to characterise mesoporous a-Fe 2 O 3 is also discussed.

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“…Because of these characteristics, LAGP compounds are of technological interest, since they are good candidates to be used as solid-electrolytes in lithium ion batteries [1][2][3] , or as membranes in electrochemical sensors 4 . Since electrical and mechanical properties are dependent on the microstructure 5 , which may be tailored by controlled crystallization, knowledge about the crystallization kinetics of this family of glasses is of fundamental interest.…”

Section: Introductionmentioning

confidence: 99%

Determination of crystallization kinetics parameters of a Li1.5Al0.5Ge1.5(PO4)3 (LAGP) glass by differential scanning calorimetry

2013

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Crystallization kinetics parameters of a stoichiometric glass with the composition Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 were investigated by subjecting parallelepipedonal samples (3 × 3 × 1.5 mm) to heat treatment in a differential scanning calorimeter at different heating rates (3, 5, 8 and 10 °C/min). The data were analyzed using Ligero's and Kissinger's methods to determine the activation energy (E) of crystallization, which yielded, respectively, E = 415 ± 37 kJ/mol and 378 ± 19 kJ/mol. Ligero's method was also employed to calculate the Avrami coefficient (n), which was found to be n = 3.0. A second set of samples were heat-treated in a tubular furnace at temperatures above the glass transition temperature, T g , to induce crystallization. The X-ray diffraction analysis of these samples indicated the presence of LiGe 2 (PO 4 ) 3 which displays a NASICON-type structure. An analysis by optical microscopy revealed the presence of spheric crystals located primarily in the volume, in agreement with the crystallization mechanism predicted by the Avrami coefficient.

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Effect of micro- and nano-structures on the properties of ionic conductors

Cited by 65 publications

References 15 publications

Ionic conductivity in oxide heterostructures: the role of interfaces

Ionic conductivity in oxide heterostructures: the role of interfaces

Structure and dynamics in nanoionic materials

Determination of crystallization kinetics parameters of a Li1.5Al0.5Ge1.5(PO4)3 (LAGP) glass by differential scanning calorimetry

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