> Solid state synthesis of materials which include both oxides and non-oxides. Polyanion based materials (phosphates, sulfates, phosphites, boro-phosphates etc.), complex chalcogenides, porous materials (MOFs, organically templated solids, zeolites and zeolite related).
> X-ray crystallography including single-crystal and powder X-ray diffraction (laboratory and synchrotron), Solid state electrochemistry (Lithium- and sodium-ion batteries, Solid electrolytes), Magnetic properties, Electronic properties, catalysis, sorption.
Current research projects
- Electrode Materials for Li- and Na-ion batteries In this particular project we are trying to explore the synthesis of
polyanion-based materials stabilized by transition metals like Ti, V,
Mn, Fe. Systematic exploration of the phase diagram of Li/Na - M -
XOmn- (X = Si, Ge, P, S, and B; M = transition metals) are being carried
out by employing (i) molten salt flux and (ii) hydrothermal techniques
to explore the formation of new structures. Simultaneously, we also
apply chemical intuition to innovate new synthetic strategies to
synthesize a target composition. X-ray diffraction techniques, both
single-crystal and powder X-ray diffraction are extensively used to
solve crystal structures. We rely on high resolution X-ray diffraction
data from Argonne National Lab for ab initio crystal structure solution
and refinement. Fundamental properties related to the reductive
insertion or oxidative de-insertion of alkali ions in batteries are
studied by a multitude of tools to correlate crystal structures with
- Complex Chalcogenides In this project new multinary chalcogenide compositions are
synthesized and structurally characterized. Exploratory routes using
polychalcogenide flux as well as hypothesis driven chemistry guides
the synthesis of target compositions. Major effort in this area are now
devoted to rationally synthesize complex chalcogenides aiming
different applications including thermoelectrics, solid-ion conductors
and electrode materials. Theoretical calculations are carried out in
collaboration with Drs. Medvedeva and Chernatynskiy (Physics,
Missouri S&T) to get further insights into the structure-property-
correlation. Low and high temperature thermoelectric properties
(Thermal conductivity, Resistivity, and Seebeck Coefficient) are
measured in collaboration with Dr. Hor (Physics, Missouri S&T), Dr.
Watts (MS&E, Missouri S&T), and Dr. McGuire (ONL). Choudhury group
has all the facilities to for electrode materials applications.
- Porous solids We are interested in synthesizing new multicomponent porous solid,
which are hydrolytically stable and has multi-functionality. In this
endeavor we target inorganic-organic hybrid or purely inorganic
(zeolitic) structures. These porous materials are subsequently tested
for gas storage and catalysis.