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Kumar P.,Dehradun Institute of Technology | Juneja J.K.,PG Hindu College | Singh S.,GVM Girls College | Raina K.K.,Thapar University | And 2 more authors.
Ceramics International | Year: 2015

Single phase polycrystalline lithium ferrites modified with Zn and Mn were synthesized by solid state reaction method. The prepared samples exhibit a markedly increased value in real part of dielectric constant (ε) and a lowest loss tangent (tanδ) for x=0.04 measured in the frequency range 70 Hz to 1 MHz. The saturation magnetic moment (Ms) varies non-monotonically for different values of x. A maximum value of Ms=76 emu/g has been found for x=0.02. Such results in lithium ferrite based ferrites being found rarely. © 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.


Gupta U.,Guru Jambheshwar University of Science and Technology | Mohan D.,Guru Jambheshwar University of Science and Technology | Ghoshal S.K.,Addis Ababa Institute of Technology | Nasa V.,GVM Girls College
Journal of Photochemistry and Photobiology A: Chemistry | Year: 2010

Dynamics related to the optical effect of Methylene Blue (MB) dye molecules in solid host has been investigated. MB doped silica samples of varying concentrations are prepared by the sol-gel technique in acidic environment. Absorption and laser induced fluorescence spectra have been recorded for the samples. Interesting result of dual fluorescence at lower concentrations is explained. Attempt is done to study the dynamics of the dual fluorescence. These results may be useful for designing and developing solid-state optoelectronic devices. © 2009 Elsevier B.V. All rights reserved.


Rani R.,Electroceramics Research Laboratory | Rani R.,Hindu College | Juneja J.K.,Hindu College | Singh S.,GVM Girls College | And 2 more authors.
Ceramics International | Year: 2013

Composites having general formula 0.1Ni0.8Zn 0.2Fe2O4-0.9Pb1-3x/2Sm xZr0.65Ti0.35O3 with x=0, 0.01, 0.02 and 0.03 were synthesized by a conventional solid state reaction route. X-ray diffraction analysis was carried out to confirm the coexistence of individual phases and microstructural study was done by using a scanning electron microscope. Dielectric properties were studied as a function of temperature and frequency. To study ferroelectric and magnetic ordering in composite samples, P-E and M-H hysteresis loops were recorded respectively. Maximum magnetoelectric coupling coefficient of 22.5 mV/cm Oe was observed for sample with x=0.03. A significant improvement in dielectric, ferroelectric, piezoelectric and magnetoelectric properties was observed for Sm substitution. © 2013 Elsevier Ltd and Techna Group S.r.l.


Rani R.,Electroceramics Research Laboratory | Rani R.,Thapar University | Singh S.,GVM Girls College | Juneja J.K.,Hindu College | And 2 more authors.
Ceramics International | Year: 2011

Material series with compositional formula Ba0.9Sr 0.1ZrxTi1-xO3 (BSZT) were prepared by conventional solid state reaction route. XRD pattern shows that all the samples are well crystallized into perovskite structure. Tetragonality was found to decrease with increase in Zr content. Effect of substitution of Zr on dielectric constant, tangent loss and nature of transition temperature is discussed in the present paper. © 2011 Elsevier Ltd and Techna Group S.r.l.


Kumar P.,Electroceramics Research Laboratory | Juneja J.K.,Hindu College | Prakash C.,Solid State Physics Laboratory Lucknow Road | Singh S.,GVM Girls College | And 2 more authors.
Ceramics International | Year: 2014

Ferrites with compositional formula Li0.49Zn 0.02Mn0.06Fe2.43O4 were prepared by solid state reaction route and were sintered using conventional and microwave furnaces. The structural and electrical properties were studied and compared. Dielectric constant and tanδ were measured as a function of temperature and frequency. DC resistivity of the samples was calculated by impedance analysis in the temperature range from 25 C to 150 C. High DC resistivity (10k-100 k m) was observed for microwave sintered ferrite sample as compared to conventionally sintered sample (2-80 m) in the measured temperature range. © 2013 Elsevier Ltd and Techna Group S.r.l.

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