KLnTiO4 (Ln=La, Nd, Sm, Eu, Gd, Dy): A New Series of Ruddlesden–Popper Phases Synthesized by Ion-Exchange of HLnTiO4

✍ Scribed by Raymond E. Schaak; Thomas E. Mallouk

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 453 KB
• Volume: 161
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.2001.9303

✦ Synopsis

KLnTiO 4 (Ln ‫؍‬ La, Nd, Sm, Eu, Gd, Dy), a new series of n ‫؍‬ 1 Ruddlesden+Popper phases, was synthesized by a two-step ion-exchange reaction. HLnTiO 4 was 5rst prepared by traditional acid exchange of NaLnTiO 4 , and the KLnTiO 4 series was subsequently formed from the reaction of HLnTiO 4 with hot aqueous KOH. The ion exchange is stoichiometric, and the KLnTiO 4 phases are thermally stable to at least 7003C. All the KLnTiO 4 phases are orthorhombic and crystallize in space group Pbcm. The structures of KSmTiO 4 , KEuTiO 4 , KGdTiO 4 , and KDyTiO 4 were re5ned by the Rietveld method and found to be isostructural with their NaLnTiO 4 precursors. All the KLnTiO 4 phases form stable hydrates when exposed to a humidi5ed atomosphere.