A5001769369- Advanced Condensed Matter Physics
- High-pressure geophysics and materials
- Crystal Structures and Properties
- Geological and Geochemical Analysis
- Conducting polymers and applications
- Multiferroics and related materials
- Chemical Synthesis and Characterization
- Cold Atom Physics and Bose-Einstein Condensates
- Magnetic properties of thin films
- Physics of Superconductivity and Magnetism
- X-ray Diffraction in Crystallography
- Topological Materials and Phenomena
- Advanced Sensor and Energy Harvesting Materials
- Advanced Nanomaterials in Catalysis
- Magnetic and transport properties of perovskites and related materials
- Nuclear materials and radiation effects
- Theoretical and Computational Physics
- Crystallization and Solubility Studies
- Magnetic Properties and Applications
- Multicomponent Synthesis of Heterocycles
- Magnetic Field Sensors Techniques
- Electrochemical sensors and biosensors
- Advanced Photocatalysis Techniques
- Glass properties and applications
- TiO2 Photocatalysis and Solar Cells
The University of Sydney
2016-2022
Leibniz Institute for Solid State and Materials Research
2022
University of Auckland
2014-2021
Technische Universität Dresden
2021
Metal nitrides have potential in energy applications because of their physical and optical properties. Nanoparticle composites titanium nitride (TiN) dioxide (TiO2) were investigated for photocatalytic hydrogen (H2) evolution activity via methanol reformation. Physical mixing the nanoparticulate TiO2 TiN was employed to prevent oxy-nitride formation particle aggregation observed thermal preparations. This convenient combination demonstrated a substantial synergistic effect with enhanced (9.4...
Since the discovery of charge disproportionation in ${\mathrm{FeO}}_{2}$ square-lattice compound ${\mathrm{Sr}}_{3}{\mathrm{Fe}}_{2}{\mathrm{O}}_{7}$ by M\"ossbauer spectroscopy more than fifty years ago, spatial ordering pattern disproportionated charges has remained ``hidden'' to conventional diffraction probes, despite numerous x-ray and neutron scattering studies. We have used Larmor Fe $K$-edge resonant demonstrate checkerboard order planes that vanishes at a sharp second-order phase...
Fe4Si2Sn7O16 has a unique crystal structure that contains alternating layers of Fe(2+) ions octahedrally coordinated by O (oxide layer) and Sn (stannide layer), bridged SiO4 tetrahedra. The formula can be written as FeFe3Si2Sn7O16 to emphasise the distinction between layers. Here, we report changes in properties iron is selectively replaced manganese oxide layer. Solid-state synthesis was used produce polycrystalline samples Fe(Fe3-xMnx)Si2Sn7O16 for x≤ 2.55, structures which were...
For the first time, microwave assisted aniline oxidative polymerization is performed in presence of acetic acid (CH 3 COOH) and ammonium hydroxide (NH 4 OH) at different power levels.The reaction system kept constant temperature 24±1°C.The products are investigated by Fourier Transform Infrared Spectroscopy (FTIR), Raman, solid-state Nuclear Magnetic Resonance (NMR) Electron Paramagnetic (EPR) spectroscopies.EPR signals polyaniline (PANI) originate from polarons formed upon protonation...
We have experimentally identified a different magnetic ground state for the kagome lattice, in perfectly hexagonal ${\mathrm{Fe}}^{2+}$ ($3{d}^{6},\phantom{\rule{0.16em}{0ex}}S=2$) compound ${\mathrm{Fe}}_{4}{\mathrm{Si}}_{2}{\mathrm{Sn}}_{7}{\mathrm{O}}_{16}$. A representational symmetry analysis of neutron diffraction data shows that below ${T}_{N}=3.5$ K, spins on $\frac{2}{3}$ ions order into canted antiferromagnetic chains, separated by remaining $\frac{1}{3}$ which are geometrically...
FeMn3Ge2Sn7O16 is a fully ordered stoichiometric phase containing an undistorted hexagonal kagomé lattice of Mn2+ cations. It represents not only important expansion the chemistry complex composite FeFe3Si2Sn7O16 structure type, by replacing silicon with germanium, but also improvement on perfection anisotropic high-spin Fe2+ (d6, L = 2) isotropic (d5, 0), controlled size-matched replacement SiO44– GeO44– bridging units. This anisotropy was suspected playing role in unique "striped" magnetic...
${\mathrm{Fe}}_{4}{\mathrm{Si}}_{2}{\mathrm{Sn}}_{7}{\mathrm{O}}_{16}$ hosts an undistorted kagome lattice of ${\mathrm{Fe}}^{2+}$ ($3{d}^{6}, S=2$) ions. We present results bulk magnetization and Sn nuclear magnetic resonance (NMR) measurements on oriented powder sample in geometries parallel ($\ensuremath{\parallel}$) perpendicular ($\ensuremath{\perp}$) to the external applied field used for orienting (${B}_{\text{ori}}$). The susceptibility $\ensuremath{\chi}$ shows a broad peak at...
We have used representational symmetry analysis of neutron powder diffraction data to determine the magnetic ground state Fe4Si2Sn7O16.We recently reported a long-range antiferromagnetic (AFM) Néel ordering transition in this compound at TN = 3.0 K, based on magnetization measurements.[1] The only ions present are layers highspin Fe2+ (d6, S 2) arranged perfect kagomé lattice (trigonal space group P-3m1).[2] Below spins 2/3 these order into canted chains, separated by remaining 1/3 which...