Iron(III) oxide shows a polymorphism, characteristic of existence of phases with the same chemical composition but distinct crystal structures and, hence, physical properties. Four crystalline phases of iron(III) oxide have previously been identified: α-Fe2O3 (hematite), β-Fe2O3, γ-Fe2O3 (maghemite), and ε-Fe2O3. All four iron(III) oxide phases easily undergo various phase transformations in re...

Pulse laser deposited La2/3Sr1/3MnO3 ultrathin films on SrTiO3 substrates were characterized by polar and longitudinal Kerr magneto-optical spectroscopy. Experimental data were confronted with theoretical simulations based on the transfer matrix formalism. An excellent agreement was achieved for a 10.7 nm thick film, while a distinction in the Kerr effect amplitudes was obtained for a 5 nm thic...

Covalent linkage of oleic acid ligated Fe3O4 spheres (9 nm) with sheetlike [H1-xCa2Nb3O10] particles (300 x 300 x 2 nm) yields, depending on conditions, submicro- or microscale stacks, which on their surfaces are decorated with magnetite nanoparticles. Due to the optical anisotropy of the sheetlike Ca2Nb3O10 building blocks and due to the superparamagnetic nature of the Fe3O4 components, the na...

cu2o nanoparticles were synthesized by thermal treatment in liquid paraffin without any inert gas protection using nano structures of schiff base copper (ii) complex (1) as precursor. liquid paraffin was used as solvent and reductant. span 80 was applied to control the morphology of cuprous oxide nanoparticles. the nano structure of the complex was characterized by x-ray diffraction measurement...

A large quantity of ultrafine tetragonal barium titanate (BaTiO3) nanoparticles is directly synthesized at room temperature. The crystalline form and grain size are checked by both X-ray diffraction and transmission electron microscopy. The results revealed that the perovskite nanoparticles as fine as 7 nm have been synthesized. The phase transition of the as-prepared nanoparticles is investiga...

Lanthanide perovskite oxides are mentioned as material for hydrogen peroxide sensor because they can catalytically decompose hydrogen peroxide in an aqueous medium. The catalytic properties of these perovskite oxides to hydrogen peroxide are suggested due to their oxygen vacancies influenced by the oxide non-stoichiometry. In this paper, we investigate the catalytic hydrogen peroxide decomposit...

Point defects can affect considerably the structural, magnetic, and transport properties of perovskite-structure materials with chemical formula ABO3. Oxygen vacancies (VO), for example, enable ionic conductivity in perovskite-based solid solutions to be used for electrochemical applications such as solid oxide fuel and electrolysis cells [1]. Likewise, VO can distort significantly the equilibr...

The perovskite structure is one of the most versatile structures for tailoring the properties of materials. The range of properties of perovskites varies from superconductivity to ferroelectricity, magnetoresistance to magnetocapacitance, and laser host properties to name a few. In particular, the perovskite oxides have been explored for their dielectric and magnetic properties. Traditionally, ...

Sveinbjörnsson, K. 2018. Preparation and Characterization of Lead Halide Perovskites. Towards sustainable, cost-effective and upscalable solar cell manufacture. Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 1628. 84 pp. Uppsala: Acta Universitatis Upsaliensis. ISBN 978-91-513-0229-4. The perovskite solar cell (PSC) is a recent contender with...

in this study, magnetic iron oxide nanoparticles (fe3o4) with the size range of 20-30 nm were prepared by the modified controlled chemical co-precipitation method from the solution of ferrous/ferric mixed salt-solution in alkaline medium. in this process polyethylene glycol was used as a surfactant to prevent the solution from agglomeration. the prepared magnetic nanoparticles were characterize...