A5048030668- Advanced Condensed Matter Physics
- Magnetic and transport properties of perovskites and related materials
- Electronic and Structural Properties of Oxides
- Advanced Battery Materials and Technologies
- Advancements in Battery Materials
- Multiferroics and related materials
- Rare-earth and actinide compounds
- High-pressure geophysics and materials
- Iron-based superconductors research
- Polyoxometalates: Synthesis and Applications
- Magnetic Properties of Alloys
- Thermal Expansion and Ionic Conductivity
- Chemical Synthesis and Characterization
- Inorganic Fluorides and Related Compounds
- Crystal Structures and Properties
- Advanced Theoretical and Applied Studies in Material Sciences and Geometry
- Ferroelectric and Piezoelectric Materials
- Material Properties and Applications
- Nuclear Physics and Applications
- Aquatic and Environmental Studies
- Diverse Industrial Engineering Technologies
- Cyclone Separators and Fluid Dynamics
- Solid-state spectroscopy and crystallography
- Particle Dynamics in Fluid Flows
- Hydrogen Storage and Materials
Western University
2023-2024
University of Waterloo
2011-2017
Rutgers, The State University of New Jersey
2000-2007
State University of New York
2006
University of Antwerp
2006
Rutgers Sexual and Reproductive Health and Rights
2004
Institute of Glass
1999
Na0.44MnO2 nanowires were acid leached in nitric acid, and dehydrated by heat treatment to induce controllable defect formation as monitored high resolution TEM studies. The charge–discharge tests using these materials catalysts (or “promoters”) rechargeable lithium–oxygen batteries (in non-carbonate electrolytes) showed that a concentration results doubling of the reversible energy storage capacity up 11 000 mA h g−1, lowered overpotentials for oxygen evolution. role defects/vacancies...
Na metal batteries (NMBs) are attracting increasing attention because of their high energy density. However, the widespread application NMBs is hindered by growth dendrites and interface instability. The design artificial solid electrolyte interphase (SEI) with tuned chemical/electrochemical/mechanical properties key to achieving high-performance NMBs. This work develops a metal-doped nanoscale polymeric film tunable composition, sodiophilic sites improved stiffness. incorporation...
${\mathrm{Ba}}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MnReO}}_{6}$ $(x=0,$ 0.5, 1, 2) phases with a double-perovskite structure were prepared by solid-state techniques in evacuated sealed silica tubes. ${\mathrm{Mn}}^{2+}$ and ${\mathrm{Re}}^{6+}$ are virtually completely ordered on the B sites. The compounds ferrimagnetic below 120 K. maximum saturation moment was obtained for compound $x=0.5$ whose tolerance factor is closest to 1. whole series of compounds, $0.0<~x<~2.0,$ exhibits...
Transition-metal fluorosulfates are currently being extensively explored for their use as cathodes in Li-ion batteries. Several new polymorphs of LiMSO4F (M = Fe, Mn, Zn) crystallizing the tavorite, triplite and sillimanite structures have captured much recent interest, but synthetic access is limited underlying phase stability ion transport these materials poorly understood. Here we report that solvothermal routes to offer significant advantage over both exotic ionothermal methods solid...
A highly ordered mesoporous carbon/silica (MCS) framework was used as both a silicate precursor and carbon source to prepare Li2CoSiO4/carbon nanocomposites via hydrothermal synthesis. TEM-EDX TGA measurements showed that ∼2 wt % incorporated within Li2CoSiO4 crystal aggregates on the nanoscale. We find morphology particle size of Li2CoSiO4/C composites are significantly influenced by LiOH concentration in precursors. By controlling molar ratio LiOH:Si:Co = 8:1:1, very uniform spheres were...
In the recent hunt for novel Na-ion cathode hosts, a variety of sodium analogues classic Li-ion structures have been thoroughly explored. However, generally possess modified and dissimilar energetics compared to their due large size Na+ (102 pm) vs Li+ (76 pm), often resulting in sluggish kinetics. Materials development targeted toward new different specific host possessing optimum properties migration is crucial. Here, we report first metal fluoropyrophosphate with three-dimensional...
Quick, effective synthesis of the 4 V Li-ion battery cathode material, triplite LiFeSO4F, takes place via facile conversion defect-peppered nanocrystalline tavorite precursor that forms on ultra-rapid microwave heating (10 min) FeSO4·H2O/LiF. We propose a mechanism for its unique phase transformation to occurs as consequence disorder and hydroxyl defects induced by fast nucleation. The electrochemical properties resultant exhibits doubling practical gravimetric capacity compared material...
One concern regarding the used nuclear fuel containers proposed for use in a Canadian deep geological repository (DGR) is possibility that small amount of hydrogen might be absorbed into their copper coating, potentially altering its mechanical properties. Reported herein study absorption 50 nm copper, coated on 4 Ti using situ neutron reflectometry (NR) and electrochemical impedance spectroscopy (EIS). NR results show when cathodically polarized below threshold evolution reaction (HER), but...
The quasi-one-dimensional conductor $\mathrm{Ba}\mathrm{V}{\mathrm{S}}_{3}$ undergoes a metal-insulator transition at ${T}_{\mathit{MI}}=70\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ accompanied by formation of superstructure doubling the chain periodicity and magnetic ${T}_{X}=30\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. We present an anomalous x-ray scattering investigation charge-density wave (CDW) satellite reflections V $K$-edge. Our study shows that no charge disproportionation larger than...
Comparison studies of the perovskite compounds system ${R}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ $(R=\mathrm{L}\mathrm{a},\mathrm{}\mathrm{Bi})$ by both Mn ${K}_{\ensuremath{\beta}}$-emission spectroscopy and x-ray-absorption near-edge (XANES) are presented. The insensitivity x-ray-emission measurements to structural distortions coupled with sensitivity changes in structure valence enable one detect presence distortions, such as local Jahn-Teller (JT) distortions....
The crystal and magnetic structure of the ordered double perovskite Sr2MnReO6 was investigated by neutron diffraction. Monoclinic (space group P 21/n) distortion parent cubic revealed, refined Mn–O–Re bond angles deviate significantly from 180°. monoclinic produces antisymmetric exchange interactions, leading to a canted structure, for which possible model is proposed refined. No structural transitions were observed upon cooling or in an external field. Complementary x-ray synchrotron...
A stoichiometric LaSrMnRuO6 perovskite was synthesized by a modified sol−gel method. Special precautions were taken to minimize loss of ruthenium during the synthesis. crystallizes with an orthorhombic structure in space group Imma determined synchrotron powder X-ray diffraction; Mn/Ru cations are disordered. small amount Pmnb phase observed along major electron diffraction transformed under beam. absorption near-edge spectroscopy established formal oxidation states as Mn3+ and Ru4+....
While olivine LiFePO4 shows amongst the best electrochemical properties of Li-ion positive electrodes with respect to rate behavior owing facile Li+ migration pathways in framework, replacing [PO4]3- polyanion a silicate [SiO4]4- moiety is desirable. This could allow additional alkali content and hence electron transfer, increase capacity. Herein we explore possibility strategy toward new cathode materials demonstrate first stabilization lithium transition metal (as pure silicate) structure...
Scanning probe microscopy was used to investigate the surface topography and micromagnetic structure of ${\mathrm{La}}_{0.83}{\mathrm{Sr}}_{0.13}{\mathrm{MnO}}_{2.98}$ single crystals. The crystals were grown by fused-salt electrolysis characterized chemical analysis, x-ray-diffraction, magnetic transport measurements. Surface as-grown exhibits well-developed corrugations due extensive twinning. Magnetic force (MFM) images show that magnetic-domain boundaries are pinned crystallographic...