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Thāna Bhawan, India

Maisnam M.,Manipur University | Phanjoubam S.,Manipur University | Kumar P.,GVM Girls College | Juneja J.K.,Hindu College | And 2 more authors.
Integrated Ferroelectrics | Year: 2010

Substituted Li-ferrites are attractive materials for research due to their important properties like high Curie temperature leading to high thermal stability, high and wide range of saturation magnetization, low stress sensitivity of remanence and they are very good dielectric materials. The properties are very sensitive to the type and amount of substituents, method of preparation and sintering conditions. Attempts to minimize loss of lithia and oxygen during sintering by adopting various processing method, which otherwise is very difficult to control technologically by conventional method, has been a continuous efforts for the researchers. The present paper reports the improvements that arise in the properties of Li-Mn-Ti ferrite by using novel microwave (MW) processing technique. Mn4+ and Ti4+ substituted Li-ferrites having the compositional formula Li 0.60Mn0.1Ti0.1Fe2.20O4 were prepared by both the conventional and microwave techniques. XRD confirmed the formation of single phase with spinel structures in both the samples. Dielectric properties were studied as a function of temperature. Dielectric properties of MW processed sample were found to be more stable with temperature. Significant improvement in the d. c. resistivity was observed in theMWsintered sample over the conventional sintered sample. The possiblemechanisms involved are discussed. Copyright © 2010 Taylor & Francis Group, LLC. Source


Kumar P.,Electroceramics Research Laboratory | Kumar P.,Thapar University | Singh S.,GVM Girls College | Juneja J.K.,Hindu College | And 2 more authors.
Ferroelectrics, Letters Section | Year: 2010

In the present work, we are reporting the effect of Mn doping on the structural, dielectric and ferroelectric properties of Ba0.80Pb 0.20Ti0.90Zr0.10O3. Samples were prepared by solid state reaction route. X-ray diffraction analysis confirmed the compositions to be single phase. Dielectric properties were studied as a function of temperature and phase transition temperature (Tc) was determined. Ferroelectric behaviour was studied in detail as a function of temperature. Mn doping was found to improve temperature stability of the material. Source


Rani R.,Electroceramics Research Laboratory | Rani R.,Thapar University | Juneja J.K.,Hindu College | Raina K.K.,Thapar University | Prakash C.,Directorate of ER and IPR
Journal of Ceramic Processing Research | Year: 2012

Piezoelectric-magnetostrictive (magnetoelectric) composites using piezoelectric lead zirconate titanate (PZT) ceramic and magnetostrictive Ni-Zn ferrite (NZF) with compositional formulae (1-x) PbZr 0.65Ti 0.35O 3-x Ni 0.8Zn 0.2Fe 2O 4 with x = 0 to 0.15 in steps of 0.05, were prepared by a conventional solid state route. The presence of individual phases was confirmed using X-ray diffraction. Dielectric properties were studied as a function of temperature and frequency presuming that the interactions between the piezoelectric and magnetostrictive phases may result in various anomalies in the dielectric properties of these composites. To study the ferroelectric properties, P-E hysteresis loops were recorded. Source


Pathak A.,Indian Institute of Technology Delhi | Prakash C.,Directorate of ER and IPR | Chatterjee R.,Indian Institute of Technology Delhi
Ferroelectrics, Letters Section | Year: 2010

Samples with representative formula Pb(1-1.5x)Sm x(Zr0.7Sn0.3)0.938Ti 0.062O3 (PSmZST) with x = 0.0, 0.01, 0.02 and 0.04 were synthesized using conventional solid state ceramic route. Dielectric properties were studied as a function of frequency and temperature. Dielectric constant curves show a hump before the paraelectric transition. Dielectric loss measurements show noticeable changes as compare to the unmodified composition. ac conductivity measurements show that conductivity of samples increases with increase of samarium (Sm) content. Copyright © Taylor & Francis Group, LLC. Source


Maisnam M.,Manipur University | Phanjoubam S.,Manipur University | Prakash C.,Directorate of ER and IPR
Modern Physics Letters B | Year: 2010

Cd2+ substituted Li-Zn ferrite with compositional formula Li0.4-x/2Zn0.2CdxFe2.4-x/2O 4 with x = 0.02, 0.03 and 0.04 were prepared by the conventional double sintering ceramic technique. XRD technique confirmed the formation of single phase with spinel structure. The substitution causes an increase in the lattice constant, density and DC resistivity, while the Curie temperature and dielectric constant decreases with Cd2+ substitution. The mechanisms involved are discussed. © 2010 World Scientific Publishing Company. Source

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