@article { ISI:000332188100018, title = {Large increase in the energy product of Fe3Se4 by Fe-site doping}, journal = {Journal of Physical Chemistry C}, volume = {118}, number = {8}, year = {2014}, month = {FEB}, pages = {4016-4022}, publisher = {AMER CHEMICAL SOC}, address = {1155 16TH ST, NW, WASHINGTON, DC 20036 USA}, abstract = {

Fe3Se4 possesses a large coercivity at room temperature. At lower temperature, a coercivity value up to 40 kOe has been achieved. However, due to a relatively lower saturation magnetization value, the energy product of this material is not suitable for its use as rare-earth-free hard magnetic material. Although the anisotropy and magnetic structure of Fe3Se4 have been topics of research, there is no attempt to increase the energy product. Here, we report the synthesis of Fe3-xMnxSe4 (x = 0.01-0.2) nanorods. As required for practical applications, after doping, the Curie temperature remains unchanged; however, at optimum (x = 0.03) doping of manganese ions, the magnetization of the host matrix increases significantly from 4.84 to 7.54 emu/g. The corresponding energy product value was found to be increased by more than 130\%. At low temperature (10 K) the energy product shows almost a 2 order of magnitude increase (similar to 0.12 MG Oe), which makes it valuable for many low temperature applications. This improvement is a vital step for its use in some of the household applications where a large volume and relatively lower energy product are needed.

}, issn = {1932-7447}, doi = {10.1021/jp411956q}, author = {Sen Bishwas, Mousumi and Das, Raja and Poddar, Pankaj} } @article { ISI:000337521700013, title = {Large magnetocaloric effect, moment, and coercivity enhancement after coating Ni nanoparticles with Ag}, journal = {ChemPhysChem}, volume = {15}, number = {8}, year = {2014}, month = {JUN}, pages = {1619-1623}, publisher = {WILEY-V C H VERLAG GMBH}, address = {BOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANY}, abstract = {

We observe a large magnetocaloric effect in monodisperse Ni and NicoreAgshell nanoparticles in the superparamagnetic region. The organically passivated Ni nanospheres show a large magnetic entropy change of 0.9 J kg(-1)K for a 3 T magnetic field change. In comparison to the surfactant-coated Ni nanoparticles, the NicoreAgshell nanoparticles show an enhanced coercivity, magnetization, and magnetocaloric effect (1.3 kgK for a 3 T magnetic field change). The coercivity at 10 K increases from 360 Oe for Ni nanoparticles to nearly 610 Oe for NicoreAgshell particles. This large enhancement is attributed to the enhanced inter-particle interaction, which is mediated by the metallic shell, over the relatively weaker dipolar interaction in the surfactant-coated Ni nanoparticles, and to modification of the surface spin structure.

}, keywords = {anisotropy, core-shell, magnetic properties, Nanoparticles, superparamagnetic}, issn = {1439-4235}, doi = {10.1002/cphc.201300886}, author = {Srinath, Sanyadanam and Poddar, Pankaj and Das, Raja and Sidhaye, Deepti and Bhagavatula L. V. Prasad and Gass, James and Srikanth, Hariharan} } @article { ISI:000329337000031, title = {Ligand-free one-step synthesis of {001} faceted semiconducting BiOCl single crystals and their photocatalytic activity}, journal = {Crystal Growth \& Design}, volume = {14}, number = {1}, year = {2014}, month = {JAN}, pages = {236-239}, publisher = {AMER CHEMICAL SOC}, address = {1155 16TH ST, NW, WASHINGTON, DC 20036 USA}, abstract = {

Herein, we report one-step ligand-free hydrothermal synthesis of predominantly {001}-faceted micron-sized single crystals of bismuth oxychloride (BiOCl). The structural chlorine is obtained by in situ generation of chloride ions. From Raman spectra, we could resolve the E-g transition. Photocatalytic activity of as-synthesized crystals showed 78\% degradation of RhB dye under a xenon source after 120 min of exposure.

}, issn = {1528-7483}, doi = {10.1021/cg4014366}, author = {Biswas, Anupam and Das, Raja and Dey, Chandan and Banerjee, Rahul and Poddar, Panka} }