01758nas a2200229   4500008004100000022001400041245011200055210006900167260011000236300001400346490000700360520082900367100002901196700002401225700003201249700002801281700002301309700002101332700002601353700001801379856013101397       2014                        eng d  a1477-922600aInvestigations into variations in local cationic environment in layered oxide series InGaO3(ZnO)(m) (m=1-4)0 aInvestigations into variations in local cationic environment in   aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcNOV  a2120-21260 v433 a<p>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.</p>1 aNarendranath, Soumya, B.1 aYadav, Ashok, Kumar1 aAjithkumar, Thalasseril, G.1 aBhattacharyya, Dibyendu1 aJha, Shambhu, Nath1 aDey, Krishna, K.1 aRaja, Thirumalaiswamy1 aDevi, Nandini  uhttps://library.ncl.res.in/content/investigations-variations-local-cationic-environment-layered-oxide-series-ingao3znom-m1-4-002087nas a2200253   4500008004100000022001400041245013300055210006900188260007100257300001600328490000600344520111500350653002601465653001801491653001901509653001801528653003501546100002901581700002401610700002801634700002301662700001801685856013001703       2014                        eng d  a1944-824400aPhotocatalytic H-2 evolution from water-methanol system by anisotropic InFeO3(ZnO)(m) oxides without cocatalyst in visible light0 aPhotocatalytic H2 evolution from watermethanol system by anisotr  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcAUG  a12321-123270 v63 a<p>InFeO3(ZnO)(m), series of oxides are found to give unprecedented H-2 evolution from water-methanol mixtures without using any cocatalysts. This family of compounds has an anisotropically layered structure in which Zn/FeOn polyhedra are sandwiched between InO6 octahedral layers. Local structure characterization by X-ray absorption spectroscopy reveals that Zn coordination changes from pentacoordinated to tetrahedral geometry across the series, whereas Fe geometry remains trigonal bipyramidal in all the compounds. This peculiar structure is conducive for a spatial separation of photogenerated charges reducing recombination losses. Band gap energies calculated from absorption spectra indicate potential visible light activity, and this may be due to the orbital mixing of Fe 3d and O 2p as revealed by pre-edge features of X-ray absorption spectra. Band positions are also advantageously placed for a visible light H-2 generation and is indeed found to be the case in methanol-assisted water splitting with standardized hydrogen evolution of similar to 19.5 mmol g(-1) h(-1) for all the catalysts.</p>10aanisotropic structure10aH-2 evolution10aInFeO3(ZnO)(m)10alayered oxide10aphotocatalytic water splitting1 aNarendranath, Soumya, B.1 aYadav, Ashok, Kumar1 aBhattacharyya, Dibyendu1 aJha, Shambhu, Nath1 aDevi, Nandini  uhttps://library.ncl.res.in/content/photocatalytic-h-2-evolution-water-methanol-system-anisotropic-infeo3znom-oxides-without-0