Structural change in a series of protonated layered perovskite compounds, HLnTiO4 (Ln=La, Nd and Y)

✍ Scribed by Shunsuke Nishimoto; Motohide Matsuda; Stefanus Harjo; Akinori Hoshikawa; Takashi Kamiyama; Toru Ishigaki; Michihiro Miyake

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 268 KB
• Volume: 179
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1016/j.jssc.2006.03.015

✦ Synopsis

A deuterated n ¼ 1 Ruddlesden-Popper compound, DLnTiO 4 (HLnTiO 4 , Ln ¼ La, Nd and Y), was prepared by an ion-exchange reaction of Na + ions in NaLnTiO 4 with D + ions, and its structure was analyzed by Rietveld method using powder neutron diffraction data. The structure analyses showed that DLaTiO 4 and DNdTiO 4 crystallized in the space group P4=nmm with a ¼ 3.7232(1) and c ¼ 12.3088(1) A ˚, and a ¼ 3.7039(1) and c ¼ 12.0883(1) A ˚, respectively. On the other hand, DYTiO 4 crystallized in the space group P2 1 =c with a ¼ 11.460(1), b ¼ 5.2920(4), c ¼ 5.3628(5) A ˚and b ¼ 90.441(9)1. The loaded protons were found to statistically occupy the sites around an apical oxygen of TiO 6 octahedron in the interlayer of these compounds, rather than Na atom sites in NaLnTiO 4 .