Applications selon Bauerle du tracé des diagrammes d’admittance complexe en électrochimie des solides

The role of microstructure and processing on the proton conducting properties of gadolinium-doped barium cerate

“…9,14,18 Bonanos et al 7 have recently reviewed several microstructural models for the interpretation of impedance spectra, including the "parallel layer" and "series layer" models, 19 the "constricted pathway" model, 20,21 and the "effective medium" model. 19,22 They have shown that the layer models are each a specific case of the brick layer model, while the brick layer model and the effective medium model, in turn, converge for g͞G !…”

“…1. In addition, the equivalent capacitances, C, of each subcircuit is given by (Rv 0 ) 21 . The two quantities of greatest interest are the resistances, R 1 and R 2 , associated with each of the (RQ) subcircuits.…”

Origin of the hump on the left shoulder of the X-ray diffraction peaks observed in Y2O3-fully and partially stabilized ZrO2

“…After the highest value is reached, then conductivity begins to decrease regularly as the dopant content increases [38]. Another problem is the decrease in conductivity with aging [1,2,7,10,11,[16][17][18][39][40][41][42][43][44][45][46][47][48][49][50][51][52]. In this study, I also show that the causes of these problems, mainly about stabilized ZrO 2 doped with 8 mol% Y 2 O 3, which has the highest conductivity immediately after sintering, can be clarified by means of noting the hump on the left shoulder of XRD peaks and the changes in the XRD peak shape.…”

About ionic conductivity/diffusion relationships in yttria doped zirconia

“…Oxygen vacancies (V~") are the majority defects in zirconia; they are crea___t~ by charge compensation with yttrium according to the reaction Y203 Zr02> 2Yzr + V~' +30~ (23) forming complexes (Yzr,V ) [15]. As suggested by oxygen tracer self-diffusion measurements [14], at temperatures higher than about 500 ~ many vacancies and complexes are free and mobile, while at lower temperatures they are interacting strongly, forming domains in which the migration enthalpy of vacancies and their local concentration are higher.…”