Cationic interdiffusion in some garnets

Interfacial Origin of the Magnetisation Suppression of Thin Film Yttrium Iron Garnet

“…Nevertheless, it is clear from these results that the extent and chemical nature of the interdiffusion is in remarkable agreement with the conclusions drawn from the other techniques. It is known that Gd and Y are diffusion pairs in the GGG/YIG system 21 diffusing with similar coefficients through the (c) sublattice. An interdiffusion distance of width of 6 nm implies a diffusion lengthscale of ∼3 nm either side of the original boundary.…”

An optical in-situ study of the re-oxidation kinetics of mixed valent Yb3Al5O12

“…Pankov and Bashkirov. 7 It is one of the aims of the present work to contribute to a better understanding of the reactivity and of the defect-related transport properties of these structurally complex materials.…”

Interdiffusion of rare-earth cations in Ln1−x ′Ln x ″ Ba2Cu3O7 − δ (Ln′, Ln″ = Y, Dy, Ho) High-T c superconductors

“…Pan'kov and Bashkirov [14] described Y 3+ ↔ Gd 3+ and Ga 3+ ↔ Fe 3+ interdiffusion in the Gd 3 Ga 5 O 12 -Y 3 Fe 5 O 12 system studied in the temperature range 1663-1813 K using single crystal plates. According to their results [14], the Y 3+ ↔ Gd 3+ cation interdiffu sion coefficient Gd 1 -x Y x Ga 3 -y Fe y O 12 garnet solid solutions reaches on the order of 10 -11 cm 2 /s only at 1703 K. According to our data, the of the rare earth cations in the Ba 2 Cu 3 O 7 -δ (Ln', Ln'' = Y, Dy, Ho) perovskites is of the same order at a tempera ture as low as 1233 K. Comparison of the present results with earlier data [14] leads us to conclude that the diffusion mobility of the rare earth cations in the LnBa 2 Cu 3 O 7 -δ perovskites is far higher than that in the garnets, which is obviously associated with the lower structural perfection of the LnBa 2 Cu 3 O 7 -δ phases [2].…”

“…According to their results [14], the Y 3+ ↔ Gd 3+ cation interdiffu sion coefficient Gd 1 -x Y x Ga 3 -y Fe y O 12 garnet solid solutions reaches on the order of 10 -11 cm 2 /s only at 1703 K. According to our data, the of the rare earth cations in the Ba 2 Cu 3 O 7 -δ (Ln', Ln'' = Y, Dy, Ho) perovskites is of the same order at a tempera ture as low as 1233 K. Comparison of the present results with earlier data [14] leads us to conclude that the diffusion mobility of the rare earth cations in the LnBa 2 Cu 3 O 7 -δ perovskites is far higher than that in the garnets, which is obviously associated with the lower structural perfection of the LnBa 2 Cu 3 O 7 -δ phases [2]. As pointed out above, the composition depen dences of in all of the systems studied here are non linear: the (x) curves have a well defined (albeit broad) minimum in the composition range Ba 2 Cu 3 O 7 -δ (x ≈ 0.5) (Fig.…”