The Gel Route to Yttrium Oxide

Abstract

Synthesis of pure Y2O3 Powders have been performed through the sol-gel process. Stable colloids in the range of 500 Å to 2000 Å have been obtained by hydroxylation of yttrium-aquo ions performed through an anion exchange resin.The chemical nature of these sols and gels investigated by GTA, DTA and EXAFS is in close agreement with Y(OH)3nH2O. Scattering experiments (S.A.N.S, S.A.X.S, light scattering) show that these colloids are made of anisotropie particles, that can be described as platelets 30 Å thick, 500 Å large and a few thousand Angstroms long.This synthesis can be extended to other rare earth colloids.

Scandium oxide nanoparticles produced from sol–gel chemistry

“…that the organic ligands may be combined with scandium atoms on the surface of the platelets and also within the inter-sheet spacing. Similar lozenge shapes have been produced by sol±gel polycondensation to form Y(OH) 3 , 17 and by thermohydrolysis of chelated oxo±hydroxy±iron precursors. 18 The advantage of such ¯at scandia lozenge particles lies in their potential horizontal organization on a surface when deposited from a liquid phase.…”

Recent advances in alkoxo and aryloxo chemistry of scandium, yttrium and lanthanoids

“…[Ln(OAr)2] + 2C6F5H Ln = Yb; OAr = 2,6-di-tert-butylphenoxide and 2,4,6-tri-tert-butylphenoxide; Ln = Eu, Yb, OAr = 2,6-di-terf-butyl-4-methylphenoxide (30) Hg(C6F5)2 + 2ArOH + Yb [Yb(OAr)2] + 2C6F6H + Hg| OAr = 2,6-di-tert-butyl-4-methylphenoxide (31) Further reaction of [(C5Me5)2CeCH(SiMe3)2] with an excess of 2,6-di-terf-butylphenol at room temperature gives72 the product as shown in eq 33.…”