Calculation of Misfit-Dislocation Density Generated by Lattice Mismatch at the NiSi2-Si Interface

Kikuchi, Akira

doi:10.1002/1521-3951(199709)203:1<79::aid-pssb79>3.0.co;2-a

Cited by 9 publications

(2 citation statements)

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“…These dislocations are associated with the formation of coherent interfaces between crystallites, permitted by the lattice mismatch strain at room temperature of x = 0.05 of 0.56%, which is lower than that of BSCFW (0.74%). The interface‐defect density is theoretically calculated using the heteroepitaxial strained layer model, [ 32 ] that estimates the edge dislocation density at the SP/DP interface of x = 0.05 to be of the order of 10 10 –10 12 cm −2 (full details provided in Note S2, Supporting Information). According to the definition of dislocation density ( N ), the number of dislocation lines crossing the unit area in x = 0.05 is 2.5 × 10 12 cm −2 observed directly from HAADF‐STEM images, in good agreement with the range above determined through calculation.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Long‐Term Cathode Stability by Tuning Interfacial Nanocomposite for Intermediate Temperature Solid Oxide Fuel Cells

Dawson

Zanella

et al. 2022

Adv Materials Inter

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Performance durability is one of the essential requirements for solid oxide fuel cell materials operating in the intermediate temperature range (500–700 °C). The trade‐off between desirable catalytic activity and long‐term stability challenges the development and commercialization of electrode materials. Here an oxygen cathode material, Ba0.5Sr0.5(Co0.7Fe0.3)0.69−xMgxW0.31O3−δ (BSCFW‐xMg), that exhibits excellent electrocatalytic performance through the addition of an optimized amount of Mg to the self‐assembled nanocomposite Ba0.5Sr0.5(Co0.7Fe0.3)0.69W0.31O3−δ (BSCFW) by simple solid‐state reaction is reported. Distinct from the bulk and surface approaches to introduce vacancies and defects in materials design, here the Mg2+ ions concentrate at the single perovskite/double perovskite interface of BSCFW with dislocations and Mg2+‐rich nanolayers, resulting in stressed and compositionally inhomogeneous interface regions. The interfacial chemistry within these nanocomposites provides an additional degree of freedom to enable performance optimization over single phase materials and promotes the durability of alkaline‐earth based fuel cell materials.

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Section: Resultsmentioning

confidence: 99%