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Comprehensive investigation of structural,dielectric and local piezoelectric properties of KNN ceramics

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Journal of Advanced Dielectrics 2019年第2期9卷 33-44页

作者： Poonam Kumari Madan Lal Sunil Kumar Radheshyam Rai anupinder singh D.V.Karpinsky Igor Bdikin Department of Physics ACBS Eternal UniversityBaru Sahib 173101 Himachal PradeshIndia Department of Physics Guru Nanak Dev University Amritsar 143005India Scientific-Practical Materials Research Centre of NAS of Belarus Minsk 220072 BelarusIndia National Research University of Electronic Technology“MIET”Zelenograd 124498 MoscowRussia TEMA-NRD Mechanical Engineering Department and Aveiro Institute of Nanotechnology(AIN)University of AveiroAveiro 3810-193Portugal

In this research paper,we utilized the traditional high-temperature solid-state reaction method to fabricate the K_(0.495)Na_(0.520)NbO_(3),K_(0.480)Na_(0.535)NbO_(3)and K_(0.475)Na_(0.540)NbO_(3)(abbreviated as KNN-1,KNN-2,and KNN-3,respectively)lead-free ion deficient ceramics for understanding the influence of ionic deficiency on the crystalline structure and dielectric/piezoelectric properties of the samples.X-ray diffraction patterns of these samples exhibited a perovskite tetragonal *** anomalies around 287℃and 471℃were identified as ferroelectric to ferroelectric and ferroelectric to paraelectric-transition temperatures for KNN-2 at 1 *** was found that the composition KNN-2 exhibit relatively high Curie temperature i.e.,471℃.The conductivity plots confirm that the activation energies are *** impedance behavior in our ceramic samples can be analyzed with the bulk/grain *** slope of Z′with temperature shows negative temperature coefficient of resistance(NTCR)type behavior in proposed KNN ceramics material.

关键词： KNN dielectric properties X-ray diffraction(XRD) NTCR PFM

Agreement in experimental and theoretically obtained electrocaloric effect in optimized Bi^(3+)doped PbZr_(0.52)Ti_(0.48)O_(3)material

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Journal of Advanced Dielectrics 2022年第3期12卷 17-27页

作者： Shubhpreet Kaur Mehak Arora Sunil Kumar Parambir singh Malhi Mandeep singh anupinder singh Department of Physics Guru Nanak Dev UniversityAmritsar143001 PunjabIndia Department of Chemistry Guru Nanak Dev UniversityAmritsar143001 PunjabIndia

This work harmonizes the experimental and theoretical study of electrocaloric effect(ECE)in(Pb_(0.8)Bi_(0.2))(Zr_(0.52)Ti_(0.48))O_(3)solid solution by optimizing sintering ***^(3+)-doped PbZr_(0.52)Ti_(0.48)O_(3)solid solutions were synthesized by the conventional solid-state reaction *** samples were prepared by varying the sintering temperature.X-ray diffraction study con-firms the crystalline nature of all the *** immense value of polarization has been acquired in the optimized *** maximum adiabatic temperature change of order 2.53 K with electrocaloric strength of 1.26 K mm kV^(−1)has been achieved *** a comparatively close value of ECE has been acquired from the theoretical calculations using a phenomeno-logical ***,a large value(218 mJ cm^(−3))of thermal energy conversion has been obtained using the Olsen cycle.

关键词： Ferroelectrics solid-state reaction method electrocaloric effect energy harvesting

Evaluation of dielectric,energy storage and multiferroic properties of PrFeO_(3)-PbTiO_(3)solid solutions

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Journal of Advanced Dielectrics 2022年第5期12卷 19-31页

作者： Mehak Arora Shubhpreet Kaur Sunil Kumar Parambir singh Malhi Mandeep singh anupinder singh Department of Physics Guru Nanak Dev UniversityAmritsar 143001 PunjabIndia Department of Chemistry Guru Nanak Dev UniversityAmritsar 143001 PunjabIndia

This work promotes the room temperature energy storage properties of the *** this approach,impacts of PrFeO_(3)doping on PT-based solid solutions(Pb1−xPrxTi1−xFexO_(3),x=0.21,0.22,0.23,0.24,0.25 and 0.26)have been explored.X-ray diffraction(XRD)patterns were used to estimate the crystallographic parameters,confirming the single phase tetragonal *** ferroelectric Curie temperature(Tc FE)is observed to drop from 410 K to below room temperature as the Pr concentration *** ferroelectric P-E loops were used to determine the energy storage values at room *** sample x=0.24 achieved the maximum value of energy storage density of 362.25 mJ/cm^(3)with the efficiency of 40.5%.The ferroelectric P-E loops were used to determine the energy storage values at room *** validity of magnetoelectric coupling in all samples was confirmed by magneto-dielectric studies and found that the sample x=0.24 shows the maximum response with the coupling coefficient(γ)=15.54 g^(2)/emu^(2).

关键词： Ferroelectrics energy storage multiferroics magneto-dielectric coupling coefficient.

Establishment of magneto-dielectric effect and magneto-resistance in composite of PLT and Ba-based U-type hexaferrite

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Journal of Advanced Dielectrics 2023年第5期13卷 42-47页

作者： Kanika Aggarwal Madan Sharma Shubhpreet Kaur Vishal Arora Indu Sharma Rakesh Kumar anupinder singh Department of Physics Sant Longowal Institute of Engineering and Technology Longowal 148106PunjabIndia Multifunctional Materials Laboratory Department of PhysicsGuru Nanak Dev University Amritsar 143005PunjabIndia Department of Physics and Electronics Hindu College Amritsar 143001PunjabIndia Department of Physics Career Point UniversityHamirpur 176041 Himachal PradeshIndia Ludhiana Group of Colleges Affiliated by IKGPTU Kapurthala 140407 PunjabIndia

We are examining the behavior of a composite made of ferroelectrics with strong dielectric properties and ferrites with magnetic properties due to the rising need for materials for multipurpose *** application avenues will be favored by the pairing of these materials’individual qualities with one *** and U-type hexaferrite composite materials have been chosen for this study based on their magnetic and dielectric *** composites,(1−x)PLT−x(Ba1−3xNd2x)4Co2Fe36O60 where x=0.52,0.54,0.56,0.58 are prepared by solid state reaction method and phase formation was *** has been given to the magnetic,dielectric,and magneto-dielectric *** work has established the link between the electric and magnetic domains while applying electric and magnetic forces to the *** magneto-dielectric research revealed magneto-electric coupling in all of the ***,the sample shows the maximum coupling for x=0.54 with MDR%values of 93.17%,which might be because this sample appears to have a high magneto-resistance(161%).

关键词： Perovskite U-type hexaferrite magneto-dielectric effect magneto-resistance response