Electrical conductivity of nanocrystalline ceria and zirconia thin films

Kosacki, Igor

doi:10.1016/s0167-2738(00)00591-9

Cited by 292 publications

(246 citation statements)

References 6 publications

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“…It cannot be fitted with a single straight line, because of the nano-crystalline nature of the material. Two different straight lines -one in low temperature region and the other in high temperature region -are needed to fit the curve [19,20] shown in Figure 7. The oxide ionic conductivity is found to increase with increase in temperature.…”

Section: Resultsmentioning

confidence: 99%

“…The oxide ionic conductivity is found to increase with increase in temperature. The bulk activation energy of the GDC pellet for the high temperature region from the Arrhenius plot is Thin films of the synthesized samples may have activation energy two or three powers less [20,21]. Hence an increase in ionic conductivity can be expected at intermediate temperatures (~500 -750 ∘ C).…”

Section: Resultsmentioning

confidence: 99%

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Study on Electrical conductivity and Activation Energy of doped Ceria nanostructures

Priya

Sandhya

Rajendran

2018

Electrochemical Energy Technology

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Ce 0.8 Gd 0.2 O 2−δ (GDC) and Ce 0.8 Sm 0.2 O 2−δ (SDC) nanocrystalline materials are prepared by a solid state reaction method. The synthesized nano crystalline solid solutions have cubic fluorite structure as evident from XRD patterns. The materials are qualitatively analyzed by FTIR. The morphology, size and shape of grains etc. are identified from the SEM images. The grain size of GDC is smaller than that of SDC. The better morphology is obtained for GDC. Hence, this is electrically characterized. The activation energy is calculated from the slope of Arrhenius plot (showing variation of conductivity with temperature).

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Study on Electrical conductivity and Activation Energy of doped Ceria nanostructures

Priya

Sandhya

Rajendran

2018

Electrochemical Energy Technology

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“…This increased energy may result in segregation of the Hf atoms to the grain boundaries in case of high-energy ion bombardment during growth. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 increases in ionic conductivity with decreasing grain size [9,27], whereas Peters et al report decreases in conductivity [14]. However the role of impurities is not considered in either study.…”

Section: Ionic Conductivitymentioning

confidence: 99%

Effects of dopant concentration and impurities on the conductivity of magnetron-sputtered nanocrystalline yttria-stabilized zirconia

Sillassen¹,

Eklund²,

Pryds³

et al. 2010

Solid State Ionics

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Cubic yttria-stabilized zirconia (YSZ) films with yttria concentrations of 8.7, 9.9, and 11 mol% have been deposited by reactive pulsed DC magnetron from Zr-Y alloy targets. The overall microstructure and texture in the films showed no dependence on the yttria -concentration. Films deposited at floating potential had a <111> texture. Single -line profile analysis of the 111 X-ray diffraction peak yielded a grain size of ~18 nm and a microstrain of ~2%, regardless of deposition temperature. Films deposited at 400 ºC and selected bias voltages in the range from -70 V to -200 V showed a reduced grain size for higher bias voltages, yielding a grain size of ~ 7 nm and a microstrain of ~2.5% at a bias voltage of -200 V with additional incorporation of argon.Furthermore, the effect of impurities on the ionic conductivity has been investigated, since Hf impurities were found in the samples with yttria concentrations of 8.7, and 9.9 mol%. Temperaturedependent impedance spectroscopy of the YSZ films, deposited at 400 ºC and floating potential, showed no variation of the in-plane ionic conductivity with yttria concentration. However, for films 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 2 deposited at 400 ºC and a bias -70 V, the in-plane ionic conductivity decreased systematically for samples with yttria concentrations of 8.7 and 9.9 mol% compared to the sample with 11 mol% yttria. This suggests that ionic conduction is not a purely bulk mechanism, but mainly related to the grain boundaries. The activation energy for oxygen ion migration was determined to be between 1.25 and 1.32 eV. Manuscript Click here to view linked References

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“…[3][4][5] It is now possible to deposit polycrystalline as well as highly textured CGO thin films on to various substrates like MgO(001), LaAlO 3 (001), NdGaO 3 (001), sapphire, and Si(001). [6][7][8][9][10][11][12] Epitaxial CGO thin films can also be deposited by properly choosing the substrate and experimental conditions. With regards to the improvement of ionic conductivity in solid oxide electrolyte materials (ionic conductors in general), it is understood that strain in the material also plays an imperative role.…”

mentioning

confidence: 99%

Strain induced ionic conductivity enhancement in epitaxial Ce0.9Gd0.1O2−δ thin films

Kant

Esposito

Pryds

2012

Applied Physics Letters

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Strained epitaxial Ce0.9Gd0.1O2−δ (CGO) thin films are deposited on MgO(001) substrates with SrTiO3 (STO) buffer layers. The strain in CGO epitaxial thin films is induced and controlled by varying the thickness of STO buffer layers. The induced strain is found to significantly enhance the in-plane ionic conductivity in CGO epitaxial thin films. The ionic conductivity is found to increase with decrease in buffer layer thickness. The tailored ionic conductivity enhancement is explained in terms of close relationships among epitaxy, strain, and ionic conductivity.

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Electrical conductivity of nanocrystalline ceria and zirconia thin films

Cited by 292 publications

References 6 publications

Study on Electrical conductivity and Activation Energy of doped Ceria nanostructures

Study on Electrical conductivity and Activation Energy of doped Ceria nanostructures

Effects of dopant concentration and impurities on the conductivity of magnetron-sputtered nanocrystalline yttria-stabilized zirconia

Strain induced ionic conductivity enhancement in epitaxial Ce0.9Gd0.1O2−δ thin films

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