Electroceramics Research Laboratory

Sonīpat, India

Electroceramics Research Laboratory

Sonīpat, India

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Rani R.,Electroceramics Research Laboratory | Kumar P.,Dehradun Institute of Technology | Singh S.,GVM Girls College | Juneja J.K.,Hindu College | Prakash C.,Solid State Physics Laboratory
Journal of Alloys and Compounds | Year: 2017

A comparative study of conventional (CS) and microwave sintered (MS) magnetoelectric (ME) composites with compositional formula 0.90Ba0.9Sr0.1Zr0.04Ti0.96O3+0.10Ni0.8 Zn0.2Fe2O4 (BSZT-NZF) was done. The present report is on the achievement of comparable properties achieved by microwave sintering of the composites at an expense of less energy and time as compared to conventional sintering. The value of magnetoelectric coupling coefficient ‘α’ was found to be increased by 12.5% by microwave sintering. The value of α was 1.6 and 1.8 mV/cm-Oe for CS and MS composite sample respectively. The dielectric, ferroelectric and magnetic properties were found to be improved for MS composite sample. © 2016 Elsevier B.V.


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.


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.


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.


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 | Kumar P.,Thapar University | Singh S.,GVM Girls College | Juneja J.K.,Hindu College | And 2 more authors.
Ceramics International | Year: 2011

Ba0.80-xCaxPb0.20Ti0.90Zr 0.10O3 ceramics (x = 0, 0.10 and 0.20) were synthesized by solid state reaction. Samples microstructure and dielectric, ferroelectric and piezoelectric properties were studied. Dielectric constant (ε), coercive field (Ec), remanent polarization (Pr) and ratio of remanent to spontaneous polarization (Pr/Ps) were studied at different temperatures. Sample with x = 0.10 was found to have maximum and comparatively more stable Pr/Ps ratio over a wide temperature range. Dielectric loss was found to improve with increase in x whereas piezoelectric charge coefficient d33 was found to decrease with increase in x. © 2011 Elsevier Ltd and Techna Group S.r.l.


Rani R.,Electroceramics Research Laboratory | Rani R.,Thapar University | Juneja J.K.,Hindu College | Singh S.,GVM Girls College | And 2 more authors.
Journal of Magnetism and Magnetic Materials | Year: 2013

The magnetoelectric (ME) composites with composition (y)Ni 0.8Zn0.2Fe2O4+(1-y) Ba 0.90Sr0.10Zr0.04Ti0.96O3 ((y)NZF+(1-y)BSZT) (where y=0.00-0.15 in wt%) were prepared by the conventional solid state reaction route. The existence of both phases was confirmed by the X-Ray diffraction technique and the lattice parameters for all samples were calculated. The dielectric properties such as dielectric constant and dielectric loss were measured as a function of temperature at different frequencies. P-E hysteresis loops and M-H hysteresis loops confirm the ferroelectric and ferrimagnetic nature of the composite samples. M-H loops for electrically poled and un-poled samples were compared to prove ME evidences. Variation of ME coefficient (α) with dc magnetic field was also studied for all composite samples. The maximum value of α (1.6 mV/cm Oe) was observed for y=0.10 at 750 Oe. © 2013 Elsevier B.V. All rights reserved.


Rani R.,Electroceramics Research Laboratory | Rani R.,Thapar University | Juneja J.K.,Hindu College | Singh S.,GVM Girls College | And 2 more authors.
Journal of Magnetism and Magnetic Materials | Year: 2013

Magnetoelectric composites of nickel zinc ferrite (NZF) and La substituted lead zirconate titanate (PLZT) having representative formula 0.1Ni 0.8Zn 0.2Fe 2O 4-0.9Pb 1-3x/2La xZr 0.65Ti 0.35O 3 (x=0, 0.01, 0.02 and 0.03) were synthesized by a conventional solid state route. X-ray diffraction analysis was carried out to confirm the coexistence of individual phases. Scanning electron microscope micrographs were taken for microstructural study of the samples. 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. M-H hysteresis loops were taken for electrically poled and unpoled samples to confirm magnetoelectric coupling between the two phases (NZF and PLZT). La substitution results in significant improvement in dielectric, ferroelectric and piezoelectric properties of composite samples. © 2012 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.


Kumar P.,Electroceramics Research Laboratory | Kumar P.,Thapar University | Singh S.,GVM Girls College | Spah M.,GVM Girls College | And 3 more authors.
Journal of Alloys and Compounds | Year: 2010

Barium titanate is one of the most studied ferroelectric materials which has been used in various forms, e.g. bulk, thin and thick films, powder, in a number of applications. In order to achieve a material with desired properties, it is modified with suitable substituents. Most common substituents have been strontium, calcium and zirconium. Here, we report studies on lead and zirconium substituted barium titanate. The material series with compositional formula Ba0.80Pb0.20Ti1-xZrxO3, with x varying from 0 to 0.1, was chosen for investigations. The material was synthesized by solid-state reaction method. Reacted powders compacted in the form of circular discs were sintered at 1300 °C. All the samples were subjected to X-ray diffraction (XRD) analysis and found to have single phase perovskite structure. Dielectric behavior was studied as a function of frequency and temperature. Curie temperature (Tc) was found to decrease with increasing x. © 2009 Elsevier B.V. All rights reserved.

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