Research needs and opportunities in highly conducting electroceramics

Weber, William J.; Tuller, Harry L.; Mason, Thomas O.; Cormack, Alastair N.

doi:10.1016/0921-5107(93)90111-y

Cited by 20 publications

(7 citation statements)

References 97 publications

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“…This makes it an attractive solid electrolyte for intermediate temperature SOFCs (IT-SOFCs), which are more economically favorable, have relatively cheap interconnects and seals, as well as suffer less degradation [5,6]. The development of IT-SOFC technology depends on the understanding of defect and ion transport processes in such oxide materials, which is directly responsible for the ionic conductivity in these materials [7,8].…”

Section: Introductionmentioning

confidence: 99%

Defects clustering and ordering in di- and trivalently doped ceria

Mori

Zou

et al. 2013

Materials Research Bulletin

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Section: Introductionmentioning

confidence: 99%

Defects clustering and ordering in di- and trivalently doped ceria

Mori

Zou

et al. 2013

Materials Research Bulletin

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“…In the field of material science, one of the most fundamental research subjects has been the synthesis of new compounds with unusual physicochemical functions. Among these compounds, the mixed ionic and electronic conductor has attracted much interest because of its wide applicability as an electrode in various electrochemical devices . However, it is very difficult to develop new mixed conducting materials, because they should have both the appropriate crystal structure and electronic band gap favorable for ionic and electronic conductions, respectively…”

Section: Introductionmentioning

confidence: 99%

“…Among these compounds, the mixed ionic and electronic conductor has attracted much interest because of its wide applicability as an electrode in various electrochemical devices. 1 However, it is very difficult to develop new mixed conducting materials, because they should have both the appropriate crystal structure and electronic band gap favorable for ionic and electronic conductions, respectively. 2 Such a difficulty would be overcome if it were possible to hybridize an electronic conducting layer with an ionic conducting layer into the same crystal lattice.…”

Section: Introductionmentioning

confidence: 99%

Superionic and Superconducting Nanohybrids with Heterostructure, Ag_xI_wBi₂Sr₂Ca_n_-1Cu_nO_y(0.76 ≤x≤ 1.17,n= 1, 2, and 3)

1998

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New mixed conducting hybrid systems, Ag x I w Bi2Sr2Ca n - 1Cu n O y (n = 1, 2, and 3), have been developed successfully by intercalating the superionic conducting Ag−I layer into the superconducting Bi2Sr2Ca n - 1Cu n O y lattice. Although the Ag−I intercalation gives rise to a remarkable basal increment of ∼7.3 Å, which is twice as large as that of the iodine intercalate (Δd = 3.6 Å), it has little influence on the superconducting property with only a slight T c depression. Systematic X-ray absorption near edge structure (XANES)/extended X-ray absorption fine structure (EXAFS) studies clearly reveal the charge transfer between host and guest, indicating that a change in hole concentration of the CuO2 layer is the main origin of T c evolution upon intercalation. According to the ac impedance and dc relaxation analyses, the Ag x I w Bi2Sr2Ca n - 1Cu n O y compounds possess fast ionic conductivities (σ i = 10-1.4−10-2.6 Ω-1 cm-1 at 270 °C) with the activation energies of 0.22 ± 0.02 eV, which are similar to those of other two-dimensional Ag+ superionic conductors. A more interesting finding is that these intercalates exhibit both high electronic and ionic conductivities with ionic transference numbers of t i = 0.02−0.60, due to their interstratified heterostructures consisting of a superionic conducting silver iodide layer and a metallic host layer. A close relationship between local crystal structure and ionic conductivity has been elucidated from the detailed Ag K-edge EXAFS analyses, where a reasonable pathway for Ag+ ionic conduction is suggested along with the intracrystalline structure of the Ag−I sublattice.

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“…For example, polycrystalline ceramics that are widely used in electronic devices, such as thermistors and varistors, rely on electrically active interfaces and grain boundaries for their unique operating characteristics, properties that do not exist in monocrystals [86,87]. The positive temperature coefficient (PTC) of resistance observed in donor-doped BaTiO 3 and nonlinearity of current-voltage dependence in ZnO-based resistors are a direct result of processes that are still poorly understood, but are associated with grain boundaries [7]. Metal-metal oxide interfaces that can exhibit ohmic or rectifying electrical properties play an essential role in metal-supported catalysts and in environment-sensitive devices and sensors.…”

Section: Grain Boundaries Interfaces and Segregation Phenomenamentioning

confidence: 99%

“…A number of governmental and professional society panels have been convened and the resulting reports published as recommendations [3][4][5][6][7]. All reports stress the importance of an interdisciplinary approach and call for better exchange of information among various experts involved in materials research and development.…”

Section: Introductionmentioning

confidence: 99%

Chemical research needed to improve high-temperature processing of advanced ceramic materials (Technical report)

Kolář

2000

Pure and Applied Chemistry

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Republication or reproduction of this report or its storage and/or dissemination by electronic means is permitted without the Chemical research needed to improve high-temperature processing of advanced ceramic materialsAbstract: Of the principal classes of engineering materials, ceramics are in many ways the most interesting and challenging. Many properties, or combination, of properties, not achievable with other classes of materials give ceramics enormous technical potential. The main obstacles that prevent the wider use of ceramics include insufficient reliability, reproducibility, and high cost. The physical basis of the processing steps is well established, however, the chemical reactions which occur during the high-temperature processing frequently influence the densification process and microstructure development of ceramics in an unpredictable way. Therefore, an ability to understand and control the chemical processes that occur during ceramic processing are necessary to advance and open up new uses for technical ceramics. The aim of this present report, resulting from discussions of an ad hoc group of ceramists and chemists, is to expose the areas of chemical research that can most benefit the processing, and further the use, of ceramic materials.

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Research needs and opportunities in highly conducting electroceramics

Cited by 20 publications

References 97 publications

Defects clustering and ordering in di- and trivalently doped ceria

Defects clustering and ordering in di- and trivalently doped ceria

Superionic and Superconducting Nanohybrids with Heterostructure, Ag_xI_wBi₂Sr₂Ca_n_-1Cu_nO_y(0.76 ≤x≤ 1.17,n= 1, 2, and 3)

Chemical research needed to improve high-temperature processing of advanced ceramic materials (Technical report)

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Research needs and opportunities in highly conducting electroceramics

Cited by 20 publications

References 97 publications

Defects clustering and ordering in di- and trivalently doped ceria

Defects clustering and ordering in di- and trivalently doped ceria

Superionic and Superconducting Nanohybrids with Heterostructure, AgxIwBi2Sr2Can-1CunOy(0.76 ≤x≤ 1.17,n= 1, 2, and 3)

Chemical research needed to improve high-temperature processing of advanced ceramic materials (Technical report)

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Superionic and Superconducting Nanohybrids with Heterostructure, Ag_xI_wBi₂Sr₂Ca_n_-1Cu_nO_y(0.76 ≤x≤ 1.17,n= 1, 2, and 3)