title: Redetermination of Nd2Ti2O7: a non-centrosymmetric structure with perovskite-type slabs.
abstract: Single crystals of dineodymium(III) dititanium(IV) hepta-oxide, Nd2Ti2O7, were synthesized by the flux method and found to belong to the family of compounds with perovskite-type structural motifs. The asymmetric unit contains four Nd, four Ti and 14 O-atom sites. The perovskite-type slabs are stacked parallel to (010) with a thickness corresponding to four corner-sharing TiO6 octa-hedra. The Nd and Ti ions are displaced from the geometrical centres of respective coordin-ation polyhedra so that the net polarization occurs along the c axis. The investigated crystals were all twinned and have a halved monoclinic unit cell in comparison with the first structure determination of this compound [Scheunemann & Müller-Buschbaum (1975 ▶). J. Inorg. Nucl. Chem. 37, 2261-2263].
authors: Advanced Ceramics Research Center, Nagoya Institute of Technology, Asahigaoka 10-6-29, Tajimi 507-0071, Japan.
authors: Nobuo
authors: N
authors: Ishizawa
authors: Keisuke
authors: K
authors: Ninomiya
authors: Terutoshi
authors: T
authors: Sakakura
authors: Jun
authors: J
authors: Wang
references: Acta Crystallogr D Biol Crystallogr. 2009 Feb;65(Pt 2):148-55
references: 19171970