Charu Lata Dube
Indian Institute of Technology Delhi
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Featured researches published by Charu Lata Dube.
Applied Physics Letters | 2009
Charu Lata Dube; Subhash C. Kashyap; D. C. Dube; D. K. Agarwal
This paper presents a rapid and novel technique of growing nanowires of Si0.75Ge0.25 alloy at 900 °C in less than 10 min by processing the constituents in a TE011 single mode cylindrical resonant cavity, operated at 2.45 GHz and ∼300 W. The microstructural, crystal structural, and x-ray photoelectron spectroscopic studies of the nanowires have been carried out to establish their dimensions, crystallographic structure, and composition, respectively. It is proposed that the growth of nanowires is due to electromagnetic field assisted morphological transformation.
International Journal of Green Nanotechnology: Materials Science & Engineering | 2009
Charu Lata Dube; Subhash C. Kashyap; D. C. Dube; D. K. Agarwal
ABSTRACT In the present work, silicon nanowires have been grown in a TE011 single-mode cylindrical microwave resonant cavity operating at 2.45 GHz. The microstructural, structural, elemental, and room temperature photoluminiscence studies have been carried out of the grown nanowires. The wires are encapsulated by an ultrathin layer of silicon oxynitride. The observed strong visile photoluminescenc is ascribed to ballistic transport and radiative recombination (at Si/SiON interface) of the carriers generated due to light absorption.
international conference on recent advances in microwave theory and applications | 2008
Charu Lata Dube; Subhash C. Kashyap; D.C. Dube; D. K. Agarwal
In the present work, polycrystalline ferromagnetic Zn0.95Co0.05O samples have been synthesized in a TM011 single mode cylindrical microwave resonant cavity operating at 2.45 GHz. The synthesized specimen is analyzed for its crystallographic and electronic structure along with magnetic and electron transport properties. The X-ray diffractogram and photoelectron spectroscopy of Zn0.95Co0.05O establish the incorporation of cobalt atoms into ZnO lattice. The room temperature magnetization study confirms the ferromagnetic ordering in the microwave processed highly resistive samples; which can be attributed to bound magnetic polarons model.
Synthesis and Reactivity in Inorganic Metal-organic and Nano-metal Chemistry | 2008
Subash C. Kashyap; Charu Lata Dube; D.C. Dube; D. K. Agarwal
Polycrystalline Si0.9Ge0.1 alloy has been synthesized by microwave processing in a H011 single mode cylindrical resonant cavity (2.45 GHz, 450 W) at 950°C in about 4 minutes. The X‐ray diffractograms of mixture recorded before and after the exposure to microwaves confirm the formation of Si‐Ge alloy. IR absorption spectrum also confirms Si‐Ge alloy formation along with the presence of silicon and germanium oxide in the sample. Band gap estimated from the electrical conductivity versus temperature measurement comes ∼1.08 eV. With an increase in heating time from 4 to 12 minutes, the grain size marginally increases from ∼94 to 104 nm.
Bulletin of Materials Science | 2014
Charu Lata Dube; Yashashri Patil; Shailesh Kanpara; S.S. Khirwadkar; Subhash C. Kashyap
Functionally graded tungsten–copper bimetallic compact with fine microstructure and good mechanical property has been synthesized by employing microwave heating method at a temperature of 800 °C and in a short processing time of 30 min. Scanning electron microscopy and energy dispersive X-ray analysis revealed the graded structure of synthesized sample. The fine microstructure of tungsten in each layer is caused by arrested grain growth because of the short sintering time. The overall relative density of the W/Cu functionally graded sample has reached 87% of the theoretical density. Vickers microhardness measurements, across the length of a compact, show increase in hardness value of the sample with the increase in tungsten content. The experimental hardness values match well with the theoretically calculated hardness values.
ieee applied electromagnetics conference | 2009
Subhash C. Kashyap; Charu Lata Dube; Geetanjali; R. K. Kotnala
Microwave (MW) processing of materials has recently emerged as a powerful and potential green technique. In addition to being volumetric and fast, the MW heating of a sample can modify the structure and microstructure (e.g. decrystallization, new phase formation and growth of nanowires), and is thus capable of tailoring a material to yield desired properties.
Journal of Magnetism and Magnetic Materials | 2008
A. Mahesh Kumar; M. Chaitanya Varma; Charu Lata Dube; K. H. Rao; Subhash C. Kashyap
Journal of Superconductivity and Novel Magnetism | 2011
Geetanjali; Charu Lata Dube; Subhash C. Kashyap; R. K. Kotnala
Physica Status Solidi (a) | 2009
Charu Lata Dube; Subhash C. Kashyap; Dinesh K. Pandya; D. C. Dube
Journal of Alloys and Compounds | 2009
Charu Lata Dube; Subhash C. Kashyap; D. C. Dube; D. K. Agarwal