On the precipitation of coherent spinel nanoparticles in Ti-doped MgO

Spinel precipitation in Sn4+-doped Co1−xO polycrystals with dispersed Co2+xSn1−xO4 particles

“…By contrast, in our previous study of MgO/ Mg 2 TiO 4 composite, nanosize precipitates of Mg 2 TiO 4 spinel were found to precipitate from Guinier-Preston (G.P.) zones [21] in Ti-doped MgO upon cooling [28]. The nucleation of spinel phase rather than metastable G.P.…”

Phase transformations and microstructures of TiO2–SnO2 due to solution annealing versus reactive sintering

“…zones and commensurate superstructures in Ti 4+ -dissolved MgO, 6 and Zr 4+ -doped TiO 2 . 7 The rate of interdiffusion between TiO 2 and SnO 2 is of concern to the common tangent, i.e.…”

“…could cause defect clusters and/or commensurate superstructures analogous to Ti 4+ -dissolved MgO, 6 and Zr 4+ -doped TiO 2 , 7 at a certain extent of undercooling with respect to the phase boundaries. (Upon cooling and exsolution, the Ti 4+ -dissolved MgO forms G.P.…”

“…(Upon cooling and exsolution, the Ti 4+ -dissolved MgO forms G.P. zones and then nanometer-size Mg 2 TiO 4 spinel with {1 1 1} and {0 0 1} facets, 6 whereas the Zr-doped TiO 2 forms plate-like G.P. zone with the plate surface parallel to (1 0 0) and (0 1 0) in association with dislocations.…”

On the spinel formation in Co1−xO/Co2TiO4 composites via reactive sintering, exsolution and oxidation

“…zones in Ti-doped MgO upon cooling [17]. In the present case of less stoichiometric Co 1 À x O/Co 2 TiO 4 composite, the Co 2 TiO 4 spinel was found to nucleate at dislocations, rather than G.P.…”