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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.


Kumar P.,Dehradun Institute of Technology | Singh P.,Electroceramics Research Laboratory | Singh S.,GVM Girls College | Juneja J.K.,Hindu College | And 2 more authors.
Ceramics International | Year: 2015

In the present article, lanthanum substituted modified PZT (Pb,La)(Zr,Ti,Fe,Nb)O3, (Zr:Ti=60:40) PLZFNT bulk ceramics were prepared by solid state reaction technique. The concentration of La3+ was varied from 0 to 1 mol%. X-ray diffraction (XRD) analyses of these samples suggest the formation of good quality and homogeneous single phase pervoskite compounds. Lattice parameters (a & c) were found to decrease with increase in La3+ concentration. The dielectric properties of PLZFNT were measured using LCR meter as a function of temperature and frequency. It was found that dielectric properties of the samples are highly dependent on the La3+ content. Room temperature dielectric constant was found to be increased, whereas the Curie temperature decreased with La3+ content. © 2014 Elsevier Ltd and Techna Group S.r.l.


Dipti D.,Electroceramics Research Laboratory | Dipti D.,Thapar University | Juneja J.K.,Hindu College | Singh S.,GVM Girls College | And 3 more authors.
Ceramics International | Year: 2015

Enhancement in the value of magnetoelectric (ME) coupling coefficient 'α' can be observed when lead zirconate titanate (PZT) ferroelectric material near morphotropic phase boundary (MPB) is mixed with small amount of high resistive nickel substituted cobalt ferrite (CNFO) ferrite phase in comparison to pure cobalt ferrite (CFO). The composites are prepared by a solid state reaction method. The value of 'α' was found to be 3 times (855 μV/(cm Oe)) in composites of PZT and CNFO as compared in composites of PZT and pure cobalt ferrite (298 μV/(cm Oe)). This enhancement in 'α' can be correlated with increased electrical resistivity of CFO due to substitution of Ni at Co-site. Furthermore, to confirm the multiferroicity of the prepared samples structural, dielectric, ferroelectric and magnetic properties were also measured for prepared composites. © 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

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