Hydrothermal synthesis of LnMnO3 (Ln = Ho–Lu and Y): exploiting amphoterism in late rare-earth oxides

Controlled Two-Step Formation of Faceted Perovskite Rare-Earth Scandate Nanoparticles

“…The fact that the onset of forming the perovskite phase correlated with the onset of GdOOH may imply that the dehydration from Gd(OH) 3 to GdOOH was a necessary step for subsequent reaction into GdScO 3 . We note that the ancillary evidence supports the hypothesis that the formation of REOOH is a necessary step for the hydrothermal synthesis of REMnO 3 [52]. However, the formation of REOOH was not observed with LaScO 3 , NdScO 3 , and SmScO 3 , where RE(OH) 3 was the only other identified secondary phase.…”

Crystal growth and magnetic properties of the double perovskites R2MnNiO6 (R=Pr, Sm and Ho) by a hydrothermal route

“…This can be properly explained in terms of the increased solubility and enhanced activity of the complex hydroxides formed by the initial reagents and KOH. The important role of alkalinity was usually reported in the hydrothermal synthesis of various perovskites oxides [21,22,24,27]. Although so many alkaline reagents can maintain the required alkalinity of the reaction, the crystal growth of these compounds depend on the presence of KOH.…”

Hydrothermally assisted synthesis of YMnO

“…Stability of the orthorhombic structure (space group Pnma) decreases and the hexagonal structure of these manganites (space group P6 3 cm) becomes more probable when RE is changing from Ho to Lu [3]. YMnO 3 can adopt both structures, but the orthorhombic phase can be obtained only by special synthesis methods, for example soft chemical method or mechanochemical synthesis [3][4][5]. The orthorhombic YMnO 3 exhibits an incommensurate antiferromagnetic transition at $ 40 K (T N -Néel temperature) and the ferroelectric transition at about 30 K [6,7].…”