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Chaudhari Y.,North Maharashtra University | Mahajan C.M.,Desh Technology | Singh A.,Indian Institute of Technology Delhi | Jagtap P.,North Maharashtra University | And 2 more authors.
Journal of Magnetism and Magnetic Materials | Year: 2015

Abstract Ni doped BiFeO3 (x=0, 0.05, 0.1 and 0.15) nanocrystalline ceramics were synthesized by the solution combustion method (SCM) to obtain optimal multiferroic properties. The effect of Ni doping on structural, morphological, ferroelectric, magnetic and dielectric properties of BiFeO3 was studied. The structural investigations by using X-ray diffraction (XRD) pattern confirmed that BiFe1-xNixO3 ceramics have rhombhohedral perovskite structure. The ferroelectric hysteresis measurements for BiFe1-xNixO3 (x=0, 0.05, 0.1, 0.15) compound at room temperature found to exhibit unsaturated behavior and presents partial reversal of polarization. The magnetic measurements demonstrated an enhancement of ferromagnetic property due to Ni doping in BiFeO3 when compared with undoped BiFeO3. The variation of dielectric constant with temperature in BiFe0.9Ni0.1O3 and BiFe0.85Ni0.15O3 samples evidenced an apparent dielectric anomaly around 350°C and 300°C which corresponds to antiferromagnetic to paramagnetic phase transition of (TN) of BiFeO3. The dependence of room temperature dielectric properties on frequency signifies that both dielectric constant (ε) and dielectric loss (tan δ) are the strong function of frequency. The results show that solution combustion method leads to synthesis of an excellent and reproducible BiFe1-xNixO3 multiferroic ceramics. © 2015 Elsevier B.V.


Chaudhari Y.A.,North Maharashtra University | Singh A.,Indian Institute of Technology Delhi | Mahajan C.M.,Desh Technology | Jagtap P.P.,North Maharashtra University | And 3 more authors.
Journal of Magnetism and Magnetic Materials | Year: 2013

In present paper, we synthesize the multiferroic Bi1-xZn xFe1-yNiyO3 (x=y=0.025, 0.05, 0.075 and 0.1) ceramics by using solution combustion method (SCM). The room temperature ferroelectric and magnetic hysteresis loops present the co-existence of magnetism and ferroelectricity in a single phase. This ferroelectric hysteresis loops exhibit an unsaturated behavior and represents a partial reversal of polarization at room temperature. Beside, this it was found that the room temperature magnetization measurement is giving rise to the appearance of weak ferromagnetism. The Bi0.975Zn0.025Fe 0.975Ni0.025O3 and Bi0.9Zn 0.1Fe0.9Ni0.1O3 ceramics display the clear evidence of dielectric anomaly around 300 and 325 C which corresponds to antiferromagnetic to paramagnetic phase transition of BiFeO3 ceramics. The structural study shows the Bi1-xZnxFe 1-yNiyO3 (x=y=0.025, 0.05, 0.075 and 0.1) ceramics have rhombhohedral perovskite structure. The surface morphology of the samples was examined by SEM.


Chaudhari Y.A.,Shri. Pancham Khemraj Mahavidyalaya | Mahajan C.M.,Desh Technology | Bendre S.T.,North Maharashtra University
Ceramics - Silikaty | Year: 2014

The pure and Zn incorporated BiFeO3 ceramics were synthesized by self-propagating high temperature synthesis (SHS). The X-ray diffractometer (XRD) studies revealed that, both BiFeO3 and BiFe 0.95Zn0.05O3 ceramics crystallizes in a single phase rhombhohedral structure. The room temperature ferroelectric and magnetic hysteresis loop evidenced coexistence of ferroelectricity and magnetism in single phase undoped and Zn doped BiFeO3. The M-H hysteresis loop of BiFe0.95Zn0.05O3 sample demonstrated a weak ferromagnetism at 300 K and 5 K respectively. The room temperature ferroelectric P-E hysteresis loops of BiFeO3 and BiFe0.95Zn 0.05O3 exhibited an unsaturated behavior and suggests a partial reversal of polarization. A variation of dielectric constant with respect to temperature in BiFeO3 and BiFe0.95Zn 0.05O3 ceramic delivers a dielectric anomaly around 480 and 450°C which is a consequence of antiferromagnetic to paramagnetic phase transition (TN). Moreover, for BiFeO3 the anomaly manifests a possible coupling between electric and magnetic dipole moments.


Kumar V.,Gurukula Kangri University | Chopra A.K.,Gurukula Kangri University | Srivastava S.,Desh Technology
Communications in Soil Science and Plant Analysis | Year: 2016

The assessment of heavy metals in spinach (Spinacia oleracea) grown in sewage sludge–amended soil was investigated. The results revealed that sewage sludge significantly (P < 0.01) increased the nutrients and heavy metals such as cadmium (Cd), chromium (Cr), copper (Cu), manganese (Mn), and zinc (Zn) in the soil. The contents of metals were found to be below the maximum levels permitted for soils in India. The most agronomic performance and biochemical components of S. oleracea were found at 50% concentrations of sewage sludge in both seasons. The contents of Cd, Cr, Cu, Mn, and Zn in S. oleracea were increased from 5% to 100% concentrations of sewage sludge in both seasons. The order of contamination factor (Cf) of different heavy metals was Mn > Cd > Cr > Zn > Cu for soil and Cr > Cd > Mn > Zn > Cu for S. oleracea plants after application of sewage sludge. Therefore, use of sewage sludge increased concentrations of heavy metals in soil and S. oleracea. © 2016 Taylor & Francis.


Chaudhari Y.A.,North Maharashtra University | Mahajan C.M.,Desh Technology | Abuassaj E.M.,North Maharashtra University | Jagtap P.P.,North Maharashtra University | And 2 more authors.
Materials Science- Poland | Year: 2013

Nanocrystalline multiferroic BiFeO3 ceramics was prepared by a novel solution combustion method (SCM). The X-ray diffraction (XRD) studies on structural properties of the synthesized ceramics reveal that the BiFeO 3 ceramics has rhombhohedral perovskite structure with an average crystallite size of 15 nm. The ferroelectric P-E hysteresis loop measurement at room temperature shows unsaturated behavior with a partial reversal of polarization. Investigations on temperature dependence of dielectric constant in BiFeO3 demonstrate a clear dielectric anomaly at approximately around 380 C, which corresponds to antiferromagnetic to paramagnetic phase transition (TN) and also evidences a possible coupling among the electric and magnetic dipoles of BiFeO3. A room temperature variation of dielectric constant "É" and dielectric loss "tan δ" as a function of frequency in the range of 100 Hz - 1 MHz, confirms that both dielectric constant and loss are strong functions of frequency. © 2013 Versita Warsaw and Springer-Verlag Wien.


Chaudhari Y.A.,North Maharashtra University | Mahajan C.M.,Desh Technology | Jagtap P.P.,North Maharashtra University | Bendre S.T.,North Maharashtra University
Journal of Advanced Ceramics | Year: 2013

Ni-doped BiFeO3 powders with the composition BiFe1−xNixO3 (x = 0.05, 0.1 and 0.15) were prepared by a self-propagating high-temperature synthesis (SHS), using metal nitrates as oxidizers and glycine as fuel. The X-ray diffraction (XRD) patterns depict that Ni-doped BiFeO3 ceramics crystallize in a rhombhohedral phase. The scanning electron micrographs of Ni-doped BiFeO3 ceramics show a dense morphology with interconnected structure. It is found that, the room-temperature magnetization measurements in Ni-incorporated BiFeO3 ceramics give rise to nonzero magnetization. The magnetization of Ni-doped BiFeO3 ceramics is significantly enhanced when Ni doping concentration reaches to x = 0.1 at 5 K. The variations of dielectric constant with temperature in BiFe0.95Ni0.05O3, BiFe0.9Ni0.1O3 and BiFe0.85Ni0.15O3 samples exhibit clear dielectric anomalies approximately around 450 °C, 425°C and 410°C respectively, which correspond to antiferromagnetic to paramagnetic phase transition of the parent compound BiFeO3. © 2013, The Author(s).


Aggarwal G.,Dr. Y.S. Parmar University of Horticulture and Forestry | Aggarwal G.,Desh Technology | Gaur A.,Dr. Y.S. Parmar University of Horticulture and Forestry | Srivastava D.K.,Dr. Y.S. Parmar University of Horticulture and Forestry
Journal of Forestry Research | Year: 2015

Populus species are important resources for industry and in scientific study on biological and agricultural systems. Our objective was to enhance the frequency of plant regeneration in Himalayan poplar (Populus ciliata wall. ex Royle). The effect of TDZ alone and in combination with adenine and NAA was studied on the regeneration potential of petiole explants. The explants were excised from Himalayan poplar plants grown in glass-houses. After surface sterilization the explants were cultured on shoot induction medium. High percentage shoot regeneration (86 %) was recorded on MS medium supplemented with 0.004 mg L−1 TDZ and 79.7 mg L−1 adenine. The regenerated shoots for elongation and multiplication were transferred to MS + 0.5 mg L−1 BAP + 0.2 mg L−1 IAA + 0.3 mg L−1 GA3. Root regeneration from shoots developed in vitro was observed on MS medium supplemented with 0.10 mg L−1 IBA. Himalayan poplar plantlets could be produced within 2 months after acclimatization in a sterile mixture of sand and soil. We developed a high efficiency plant regeneration protocol from petiole explants of P. ciliata. © 2015, Northeast Forestry University and Springer-Verlag Berlin Heidelberg.


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Desh Tecnologia, como toda start-up, uma empresa jovem e enxuta, porm com maturidade e seriedade de gente grande. Ns da Desh temos a preocupao de deixar claro a voc cliente, parceiro ou investidor, com quem est lidando, nossas capacidades e limitaes, e transmitir a confiana de que a Desh ser um parceiro slido para o seu negcio, independente do tamanho ou complexidade do seu projeto ...

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