Studies of structural,dielectric relaxor and electrical characteristics of lead-free double Perovskite:Gd2NiMnO6 |
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| Affiliation: | 1. Laboratoire de Physique des Matériaux, Faculté des Sciences de Sfax, Université de Sfax, B. P 1171, 3000, Sfax, Tunisia;2. Laboratoire de Physique des Matériaux et des Nanomatériaux appliquée à l’Environnement, Faculté des Sciences de Gabès, Université de Gabès, cité Erriadh, 6079, Gabès, Tunisia;1. Department of Physics, Osmania University, Hyderabad, India;2. Governament Polytechnic, Gomaram, Medak, Telangana, India;3. International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Hyderabad, Telangana, India;4. School of Physics, University of Hyderabad, India;1. Department of Chemistry, IIT Delhi, Hauz Khas, New Delhi 110016, India;2. Institute of Nano Science and Technology, Sector − 24, Mohali, Punjab 160062, India;3. Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India;1. Laboratory of Dielectric Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China;2. Ningbo Branch of China Academy of Ordnance Science, Ningbo 315103, China;1. Department of Physics, Central Institute of Technology, Kokrajhar (Deemed to be University, MHRD, Govt. of India), BTAD, Assam 783370, India;2. Department of Physics, Siksha O Anusandhan University (Deemed to be University), Khandigiri, Bhubaneswar 751030, India;1. Department of Physics, Faculty of Engineering and Technology (ITER), Siksha ‘O’ Anusandhan Deemed to Be University, Bhubaneswar, Odisha, India;2. Department of Physics, Central Institute of Technology, Kokrajhar, BTAD, Assam, 783370, India |
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| Abstract: | In the current communication, structural, microstructural, dielectric, relaxor, impedance, AC conductivity, and electrical modulus characteristics of double perovskite Gd2NiMnO6 (synthesized by a solid state reaction route) as a function of temperature (25–125 °C) and frequency (1 kHz–1MHz) have mainly been reported. From preliminary X-ray structural analysis, it is found that the crystal structure of the material is monoclinic. In temperature dependence of dielectric constant analysis, relaxor behaviour of the material was observed. Such type of behaviour is described by modified Curie–Weiss law and a Vogel–Fulcher law. From Nyquist plots, the existence of grain and grain boundary effect in the material is observed. The non–Debye type of relaxation is confirmed from the complex impedance spectroscopy. From the impedance data, the determined grain resistance reduces with increment of temperature showing negative temperature co-efficient of resistance (NTCR)-type nature of the material which also confirmed from conductivity analysis. Again, non-Debye type of relaxation phenomena is observed from the analysis of modulus spectroscopy which is also proved by complex impedance plot. From these result it may be concluded that this material may be used for different high temperature applications. |
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| Keywords: | Solid state reaction XRD Dielectric Relaxor behaviour |
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