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A combinatorial nanoprecursor route for direct solid state chemistry: Discovery and electronic properties of new iron-doped lanthanum nickelates up to La(4)Ni(2)FeO(10-sigma)

DOI: 10.1016/j.ssi.2012.04.027 DOI Help

Authors: Sam J. Alexander (University College London, U.K.) , Tian Lin (University College London, U.K.) , Dan J.l. Brett (University College London, U.K.) , Julian R.g. Evans (University College London, U.K.) , Giannantonio Cibin (Diamond Light Source) , Andrew Dent (Diamond Light Source Ltd) , Gopinathan Sankar (University College London, U.K.) , Jawwad A. Darr (University College London, U.K.)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Solid State Ionics , VOL 225 , PAGES 176 - 181

State: Published (Approved)
Published: October 2012

Open Access Open Access

Abstract: We describe a simple nanoprecursor route for direct solid-state combinatorial synthesis and discovery of heterometallic materials compositions which are normally difficult to make in a single step. Using a combinatorial robot (incorporating a continuous hydrothermal reactor), co-precipitated nanoprecursors containing different amounts of La, Ni and Fe oxides were made. These samples were divided into two identical cloned libraries, which were heat-treated to bring about solid-state transformations at either 1348 K or 1573 K for 12 h. In each case, experimental conditions were designed to form the corresponding La4Ni3 − xFexO10 phases (x = 0.0–3.0) directly without comminution. Such materials are difficult to make without multiple heating and grinding steps. The heat-treated samples from each library were embedded into a wellplate and analysed by powder X-ray diffraction methods in order to elucidate trends in phase behaviour. Several hitherto unknown phase-pure Ruddlesden Popper type La4Ni3 − xFexO10 compositions were identified and their DC electrical conductivities measured.

Journal Keywords: Continuous hydrothermal flow synthesis; Combinatorial; High-throughput; Ruddlesden Popper

Subject Areas: Chemistry

Instruments: B18-Core EXAFS