Modification of crystal structures in perovskite-type niobate nanosheets

Abstract High-resolution electron microscopy and dynamic electron diffraction have been applied to the examination of the crystallinity and modification of crystal structure of (TBA, H3O)Ca2Nb3O10 nanosheet aggregates (TBA = tetrabutylammonium) associated with multiplex synthesis processes including ion exchange, intercalation and exfoliation. Different types of superstructure have been discovered, which were generated either from the tilting of octahedra around any of the three tetrads or owing to ordering of vacancies.

[1]  H. Fukuoka,et al.  Crystal Structure of a Layered Perovskite Niobate KCa2Nb3O10 , 2000 .

[2]  T. Sasaki,et al.  Semiconductor Nanosheet Crystallites of Quasi-TiO2 and Their Optical Properties , 1997 .

[3]  P. Gómez‐Romero,et al.  Synthesis deintercalation and transport properties of a mixed-valence derivative of the layered oxide HLaNb2O7 , 1996 .

[4]  T. Sasaki,et al.  Preparation and Acid-Base Properties of a Protonated Titanate with the Lepidocrocite-like Layer Structure , 1995 .

[5]  M. Richard,et al.  Synthesis, Characterization, and Acid Exchange of the Layered Perovskites: A2Nd2Ti3O10 (A - Na, K) , 1994 .

[6]  Michael Treacy,et al.  Electron Microscopy Study of Delamination in Dispersions of the Perovskite-Related Layered Phases K[Ca2Nan−3NbnO3n+1]: Evidence for Single-Layer Formation , 1990 .

[7]  A. Jacobson,et al.  Ion Exchange of the Layered Perovskite KCa2Nb3O10 by Protons. , 1986 .

[8]  M. Vallet‐Regí,et al.  Brownmillerite-type microdomains in the calcium lanthanum ferrites: CaxLa1−xFeO3−y: I. 23 < x < 1 , 1983 .

[9]  M. Dion,et al.  Nouvelles familles de phases MIMII2Nb3O10 a feuillets “perovskites” , 1981 .

[10]  J. M. Cowley,et al.  The scattering of electrons by atoms and crystals. I. A new theoretical approach , 1957 .

[11]  T. Sasaki,et al.  Multilayer ultrathin films of molecular titania nanosheets showing highly efficient UV-light absorption , 2000 .

[12]  Zhong Lin Wang,et al.  Cobalt valence and crystal structure of La0.5Sr0.5CoO2.25 , 1998 .