Ionic Conduction Behavior in SmxNd0.15−xCe0.85O2−δ

Rai, Abhinav; Mehta, P. K.; Omar, Shobit

doi:10.1016/j.ssi.2014.06.009

Cited by 37 publications

(13 citation statements)

References 30 publications

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“…On the other hand, Rai et al . 61 reported the electrical properties of pellet based bulk ceramic with an across-plane configuration in doped cerium oxide system that exhibits the geometrical factor (A/L) of electrodes by ~16.7 cm, which is much greater than the values observed in the present work ~4 × 10 −5 cm. In this regard, the higher grain size combined with higher A/L will increase the capacitance of grain and grain boundary in the pellet based system as compared to thin film 62 .…”

Section: Resultscontrasting

confidence: 70%

Tunable transport property of oxygen ion in metal oxide thin film: Impact of electrolyte orientation on conductivity

Arunkumar

Ramaseshan

Dash

et al. 2017

Sci Rep

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Quest for efficient ion conducting electrolyte thin film operating at intermediate temperature (~600 °C) holds promise for the real-world utilization of solid oxide fuel cells. Here, we report the correlation between mixed as well as preferentially oriented samarium doped cerium oxide electrolyte films fabricated by varying the substrate temperatures (100, 300 and 500 °C) over anode/ quartz by electron beam physical vapor deposition. Pole figure analysis of films deposited at 300 °C demonstrated a preferential (111) orientation in out-off plane direction, while a mixed orientation was observed at 100 and 500 °C. As per extended structural zone model, the growth mechanism of film differs with surface mobility of adatom. Preferential orientation resulted in higher ionic conductivity than the films with mixed orientation, demonstrating the role of growth on electrochemical properties. The superior ionic conductivity upon preferential orientation arises from the effective reduction of anisotropic nature and grain boundary density in highly oriented thin films in out-of-plane direction, which facilitates the hopping of oxygen ion at a lower activation energy. This unique feature of growing an oriented electrolyte over the anode material opens a new approach to solving the grain boundary limitation and makes it as a promising solution for efficient power generation.

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Section: Resultscontrasting

confidence: 70%

Tunable transport property of oxygen ion in metal oxide thin film: Impact of electrolyte orientation on conductivity

Arunkumar

Ramaseshan

Dash

et al. 2017

Sci Rep

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“…In order to estimate the actual contribution from grain boundaries toward the total conductivity, specific grain‐boundary conductivity was determined using a brick layer model by considering the number of grains and thickness of grain boundaries present inside the samples. The dependence of specific grain‐boundary conductivity on capacitances of grain and grain boundary as well as the assumptions used for calculations are reported elsewhere . Table compares the grain and specific grain‐boundary conductivity of tested samples at 475°C, and their ratio was found to be less or close to two orders of magnitude in all the samples.…”

Section: Resultsmentioning

confidence: 99%

“…The dependence of specific grain-boundary conductivity on capacitances of grain and grain boundary as well as the assumptions used for calculations are reported elsewhere. 31 Table 1 compares the grain and specific grain-boundary conductivity of tested samples at 475°C, and their ratio was found to be less or close to two orders of magnitude in all the samples. Typically, a difference of more than two orders of magnitude between the specific grain-boundary conductivity and grain conductivity is reported in literature even for highly pure materials.…”

Section: Ionic Conductivitymentioning

confidence: 99%

Structural Characteristics and Electrical Conductivity of Spark Plasma Sintered Ytterbia Co‐doped Scandia Stabilized Zirconia

et al. 2016

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The effect of replacing Sc2O3 with Yb2O3 on the structural and electrical properties of xYb2O3–(12–x)Sc2O3–88ZrO2 has been investigated. Spark plasma sintering technique is employed to fabricate dense bulk samples from the nano‐sized powders. X‐ray diffraction and transmission electron microscopy performed on pellets indicate the existence of cubic and rhombohedral phases in 12ScSZ, and a single cubic phase in all the co‐doped compositions. However, Raman spectroscopic studies suggest the presence of a metastable tetragonal t″‐phase along with rhombohedral phases in 12ScSZ, whereas a single cubic phase in all the co‐doped compositions. Significant enhancement in the conductivity of grain and grain boundary is observed on replacing Sc2O3 with Yb2O3. In the intermediate temperature range, 1Yb11ScSZ exhibits the highest, while 12ScSZ shows the lowest conductivity values, which is attributed to corresponding phases present in that range. Through co‐doping with >1 mol% Yb2O3 leads to conductivity decrease, but the value remains higher than that of 12ScSZ. A sharp conductivity change is observed in 12ScSZ and 1Yb11ScSZ samples, which is attributed to partial phase transition as well to the formation of cation‐vacancy complexes. In this work, the beneficial effect of Yb2O3 co‐doping in 12ScSZ on the phase and conductivity has been highlighted.

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“…In addition to the numerous studies performed on singly-doped ceria systems, also a large number of doubly-and multiply-doped systems has been investigated, such as Gd/Y- [43], Gd/Sm- [44], La/Sm- [35], Sm/Nd- [45], Nd/Gd- [46], La/Dy- [47], Gd/Sm/La [48]. A general lowering of activation energy [33] and an improvement of the ionic conductivity properties [43,49,50] with respect to singly-doped ceria is often observed.…”

Section: Ionic Conductivity In Bulk Doped Ceriamentioning

confidence: 99%

High Pressure X-ray Diffraction as a Tool for Designing Doped Ceria Thin Films Electrolytes

2021

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Rare earth-doped ceria thin films are currently thoroughly studied to be used in miniaturized solid oxide cells, memristive devices and gas sensors. The employment in such different application fields derives from the most remarkable property of this material, namely ionic conductivity, occurring through the mobility of oxygen ions above a certain threshold temperature. This feature is in turn limited by the association of defects, which hinders the movement of ions through the lattice. In addition to these issues, ionic conductivity in thin films is dominated by the presence of the film/substrate interface, where a strain can arise as a consequence of lattice mismatch. A tensile strain, in particular, when not released through the occurrence of dislocations, enhances ionic conduction through the reduction of activation energy. Within this complex framework, high pressure X-ray diffraction investigations performed on the bulk material are of great help in estimating the bulk modulus of the material, and hence its compressibility, namely its tolerance toward the application of a compressive/tensile stress. In this review, an overview is given about the correlation between structure and transport properties in rare earth-doped ceria films, and the role of high pressure X-ray diffraction studies in the selection of the most proper compositions for the design of thin films.

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Ionic Conduction Behavior in SmxNd0.15−xCe0.85O2−δ

Cited by 37 publications

References 30 publications

Tunable transport property of oxygen ion in metal oxide thin film: Impact of electrolyte orientation on conductivity

Tunable transport property of oxygen ion in metal oxide thin film: Impact of electrolyte orientation on conductivity

Structural Characteristics and Electrical Conductivity of Spark Plasma Sintered Ytterbia Co‐doped Scandia Stabilized Zirconia

High Pressure X-ray Diffraction as a Tool for Designing Doped Ceria Thin Films Electrolytes

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