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Patna, India

Bhagat S.,Tilka Manjhi Bhagalpur University | Amar Nath K.,Tilka Manjhi Bhagalpur University | Chandra K.P.,Sm College | Singh R.K.,Patna Womens College | And 2 more authors.
Advanced Materials Letters | Year: 2014

Lead-free pseudo-binary compounds (1-x)Ba(Fe1/2Nb1/2)O3-xBaTiO3; (0 ≤ x ≤ 1) have been synthesized at 1200oC using conventional ceramic technique and characterized by X-ray diffraction, scanning electron microscopy, dielectric and vibration sample magnetometer studies. The crystal structure of the compounds is found to be monoclinic with the space group P2/m except for BaTiO3 for which it is tetragonal (P4/mmm). The incorporation of BaTiO3 significantly reduces the dielectric loss and improve the frequency and temperature stability of the dielectric properties of Ba(Fe1/2Nb1/2)O3. Compound 0.25Ba(Fe1/2Nb1/2)O3-0.75BaTiO3 exhibited a low value of temperature coefficient of capacitance (< ±3%) in the working temperature range (up to +85oC), room temperature dielectric constant equal to 282 and low loss tangent (~10-2) which meets the specifications for "Z5D" of Class II dielectrics of Electronic Industries Association. Hence, this composition might be a suitable candidate for capacitor applications. Besides, magnetic studies indicated the possibility of magneto-electric coupling in the system. © 2014 VBRI press. Source

Singh R.K.,Patna Womens College | Narayan A.,Patna University | Prasad K.,Central University of Jharkhand | Yadav R.S.,Allahabad University | And 4 more authors.
Journal of Thermal Analysis and Calorimetry | Year: 2012

Magnetic nanoparticles of cobalt ferrite have been synthesized by citrate precursor method. TG-DSC studies have been made to get the idea of the optimum temperature of annealing that could lead to the formation of nanoparticles. Annealing the citrate precursor was done at 450, 650, and 973 °C. The X-ray diffraction (XRD) studies and the scanning electron microscopy (SEM) have been used for characterization. The data from vibrating sample magnetometer and photoluminescence spectrometer (PL) have been analyzed for exploring their applications. Using the Scherrer formula, the crystallite size was found to be 25, 32, and 43 nm, respectively, using the three temperatures. The particle size increased with annealing temperature. Rietveld refinements on the X-ray (XRD) data were done on the cobalt ferrite nanoparticles (monoclinic cells) obtained on annealing at 650 °C, selecting the space group P2/M. The values of coercivity (1574.4 G) and retentivity (18.705 emu g-1) were found out in the sample annealed at 650 °C while magnetization (39.032 emu g-1) was also found in the sample annealed at 973 °C. The photoluminescence (PL) property of these samples were studied using 225, 330, and 350 nm excitation wavelength radiation source. The PL intensity was found to be increasing with the particle size. © Akademiai Kiado, Budapest, Hungary 2012. Source

Sinha M.R.,Patna Womens College | Dev A.,Patna Womens College | Tagore R.N.,Hai Medicare and Research Institute
Asian Journal of Chemistry | Year: 2011

Urolithiasis is associated with alteration in micro-environment integrity of urine. High citrate content diet deliver high alkali load and hence reduce the risk of formation of urinary stone. The hardness of urinary stones varies from stone to stone, depending on size and their chemical compositions. The solubility of urinary stones of different forms (whole and powder) in natural-fresh juice and in acid-hydrolyzed juice of samras (Ribes grossubaria) fruit has been investigated. The solubility efficiency was studied. This study showed that the solubility of powdered form of urinary stone was much higher than the single whole stone and comparatively much higher in acid-hydrolyzed juice than non-hydrolyzed juice i.e., natural-fresh juice of same fruits. This short term study suggests that acid-hydrolyzed formulation of fruits juice would be helpful in designing of herbal preparation for dissolving, at least partially 'the urinary stones'. However, additional studies are needed to evaluate the role of fruit's juice of samras (Ribes grossubaria) in long-term preventive and therapeutic management of urolithiasis. Source

Ranjan S.,Patna Womens College | Yasmin S.,Patna Womens College
Journal of Ecophysiology and Occupational Health | Year: 2012

Fluoride (F) was estimated in the groundwater of six blocks (Bodh Gaya, Manpur, Wazirganj, Belaganj, Amas, and Bankebazaar) of Gaya District, Bihar and the impact on human health was studied. A total of 123 samples were collected from deep and shallow hand pumps situated in 31 different villages. The water samples were analyzed for different physio-chemical properties e.g. pH, total dissolved solids(TDS), conductivity, turbidity, total hardness(TH), calcium, magnesium, iron and fluoride. Fluoride level was measured by using fluoride ion selective electrode Orion 9609BNWP with PCD 650 cyber scan portable meter. The fluoride ranged from 0.24mg/L (Manpur) to 6.2 mg/L (Bankebazar). Bhoopnagar in Amas block, Dhaneta and Bhaktauri in Bankebazar block were found to have high Fluoride in groundwater. The pre monsoon F level was insignificantly different from post monsoon level (t= 1.75, NS). The F concentration was found to be positively correlated with the pH suggesting the geogenic contamination. The major health problems found in fluoride contaminated villages were dental fluorosis (children 87 %, adults 69%) and skeletal fluorosis (adults 31%, children 59%). Residents of F endemic areas complained of Neurological Disorders (i.e Headache and Insomnia). The study shows that drinking water quality could be a major health threat for local residents of Gaya District. Source

Ranjan S.,Patna Womens College | Yasmin S.,Patna Womens College
Bulletin of Environmental Contamination and Toxicology | Year: 2015

Accumulation of Fluoride (F) was found in the soil and vegetation of the F-endemic villages of Gaya district, Bihar, India. The mean F level in the groundwater of F non-endemic (control) area was 0.59 ± 0.03 (n = 11), while that of F-endemic area was 2.36 ± 0.23 (n = 27). Water soluble F (WSF) and total F (TF) in the soil of F-endemic villages were significantly higher as compared to the F non-endemic area. Similarly, WSF and TF in the vegetables and the grain crops (cereals, legumes and oilseeds) of the F-endemic area were significantly higher as compared that of the control area. Leafy vegetables showed higher accumulation of F with WSF and TF in spinach ranging from 3.62 to 4.82 and 9.88-12.88 mg/kg respectively. The WSF and TF in coriander ranged from 9.66 to 10.88 and 23.11-25.73 mg/kg respectively. © 2014 Springer Science+Business Media. Source

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