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Ordering vacancy

Grenier JC, Pouchard M, Hagenmuller P (1981) Vacancy Ordering in Oxygen-Deficient Perovskite-Related Ferrites. 47 1-25 Grice ME, see Politzer P (1993) 80 101-114... [Pg.246]

Vacancy ordering in y-Fe203 Synchroton X-ray powder diffraction and high resolution electron microscopy studies. J.Phys. Chem.-Solids 10 35-43... [Pg.627]

Wolska, E. Schwertmann, U. (1989b) The vacancy ordering and distribution of aluminium ions in y-(Ee,Al)203. Solid State Ionics 32/33 214-218... [Pg.644]

Ozdas E, Kortan AR, Kopylov N, Ramirez AP, Siegrist T, Rabe KM, Bair HE, Schuppler S, Citrin PH (1995) Superconductivity and cation-vacancy ordering in the rare-earth fulleride... [Pg.124]

Grenier, J. C., Pouchard, M., Hagenmidler, P..-Vacancy Ordering in Oxygen-Deficient Perovskite-Related Ferrities. Vol. 47, pp. 1-25. [Pg.301]

In the brownmillerite structure, the oxygen vacancies order in such a way that half the iron of CaFe02.5 are octahedrally coordinated and half are tetrahedrally coordinated. This ordering is an expression of the tetrahedral-site stability of Fe ions. In a system like Lai yCayFe03 x < y/2, there is a tendency to form intergrowths of perovskite and brownmillerite structures the oxygen vacancies do not remain randomly distributed. Mossbauer spectra at 4.2 K for this complex system exhibit three sextets they have been interpreted in terms of 2 Fe and one Fe " ", or of an Fe and the disproportiona-... [Pg.61]

Many models have been proposed to explain oxygen and vacancy orderings in YBa2Cu307 g, but most of them do not take into account the copper coordination, for which three-fold coordination is not likely. The general model which is proposed here is based on the... [Pg.121]

Figure 6.1. (d) Perovskite transformations of LaNi03 thermogravimetriac analyses (TGA) data in air (broken curve) and in oxygen (b) ED of anion-deficient LaNiOs in [100], showing superstructure due to anion vacancy ordering arrowed. (After Gai and Rao Z. Naturforsch. a 30). [Pg.207]

Anion-deficient perovskites and vacancy-ordered structures. Anion-vacancy... [Pg.270]

One of the best-characterized perovskite oxides with ordering of anion vacancies is the brownmillerite stmctme exhibited by Ca2Fe205 and Ca2FeA105 (Grenier et al, 1981). The compositions could be considered as anion-deficient perovskites with one-sixth of anion sites being vacant. The orthorhombic unit cell of the brownmillerite structure (a = 5.425, b = 5.598 and c = 14.768 A for Ca2Fe205) arises because of vacancy-ordering and is related to the cubic perovskite as a - c-... [Pg.270]

Figure 5.25 (a) Vacancy ordering in the ab plane of CajFejOj of brownmillerite structure (b) alternating sequence of octahedral and tetrahedral layers in the c direction. Small filled circles, iron large filled circles, oxygen open squares, oxygen vacancy. [Pg.271]

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Anion-Deficient Perovskites and Vacancy-Ordered Structures

Order carbon vacancies

Ordering, covalent-bond vacancy

Oxygen vacancy ordering

Perovskites vacancy-ordered structures

Vacancy ordered

Vacancy ordered

Vacancy-ordered phases

Vacancy-ordered structures

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