title: Investigations into variations in local cationic environment in layered oxide series InGaO3(ZnO)m (m = 1-4).
abstract: Layered oxides of the series InGaO3(ZnO)m (m = 1-4) are interesting due to their structural anisotropy. Here, we report a comprehensive study of their structural details, focusing on the local cationic environment in bulk powder samples by MASNMR and EXAFS, which is hitherto not attempted. It is found that the Ga geometry varies gradually from pure pentacoordinated to a mixture of penta and tetracoordinated with increasing amounts of tetracoordination as we move across the series, contrary to previous reports suggesting exclusively trigonal bipyramidal coordination in all the compounds. A similar observation is also made in the case of Zn and structural evolution involving the dissolution of Ga in a ZnO4 tetrahedral network in a sandwich layer can be discerned, as the insulating ZnO layer size increases.
authors.affiliation: Catalysis and Inorganic Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, India. nr.devi@ncl.res.in.
authors.forename: Soumya B
authors.initials: SB
authors.lastname: Narendranath
authors.forename: Ashok Kumar
authors.initials: AK
authors.lastname: Yadav
authors.forename: T G
authors.initials: TG
authors.lastname: Ajithkumar
authors.forename: Dibyendu
authors.initials: D
authors.lastname: Bhattacharyya
authors.forename: Shambhu Nath
authors.initials: SN
authors.lastname: Jha
authors.forename: Krishna K
authors.initials: KK
authors.lastname: Dey
authors.forename: Thirumalaiswamy
authors.initials: T
authors.lastname: Raja
authors.forename: R Nandini
authors.initials: RN
authors.lastname: Devi
mesh_terms: D002412:Cations; D005708:Gallium / Q000737:chemistry*; D007204:Indium / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D010100:Oxygen / Q000737:chemistry*; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: D002412:Cations; D007204:Indium; D005708:Gallium; D010100:Oxygen; D015034:Zinc Oxide