naa a22 4500 510803717 CHVBK 20180411083407.0 cr unu---uuuuu 180411e20130301xx s 000 0 eng 10.1007/s11664-012-2376-z doi (NATIONALLICENCE)springer-10.1007/s11664-012-2376-z Electrical and Pyroelectric Properties of K2Pb2Gd2W2Ti4Nb4O30 Ferroelectrics [Elektronische Daten] [R. Padhee, Piyush Das, B.N. Parida, R.N.P. Choudhary] A polycrystalline sample of K2Pb2Gd2W2Ti4Nb4O30 was prepared by a high-temperature solid-state reaction method. The formation of the single-phase compound (at room temperature) was confirmed by preliminary x-ray structural analysis. The surface morphology recorded by scanning electron microscopy at room temperature exhibits a uniform grain distribution on the surface of the sample with few voids. Studies of the (i) variation of dielectric parameters with temperature (27°C to 430°C) and frequency (1kHz to 5MHz) and (ii) temperature dependence of polarization confirmed the existence of ferroelectricity in the material below the transition temperatures. Two dielectric anomalies observed at 304°C and 378°C suggest the existence of phase transitions in the material. The temperature and frequency dependences of electrical parameters of the material exhibit a strong correlation between microstructure and properties of the material. The temperature dependence of the direct-current (dc) conductivity shows the typical Arrhenius and negative temperature coefficient of resistance (NTCR) behavior of the material. The variation of the alternating-current (ac) conductivity with frequency obeys Jonscher's universal power law. The current variation with temperature shows that the material has high pyroelectric coefficient and figure of merit, and thus it is useful for pyroelectric sensors. Even with a small piezoelectric coefficient (4.5×10−12C/N), the material is confirmed to be ferroelectric. TMS, 2012 Ceramics nationallicence ferroelectricity nationallicence phase transitions nationallicence electrical properties nationallicence pyroelectricity nationallicence Padhee R. Department of Physics, Institute of Technical Education & Research, Siksha ‘O' Anusandahan University, Jagamohan Nagar, Jagamara, Khandagiri, 751030, Bhubaneswar, India aut Das Piyush Department of Physics, Institute of Technical Education & Research, Siksha ‘O' Anusandahan University, Jagamohan Nagar, Jagamara, Khandagiri, 751030, Bhubaneswar, India aut Parida B.N. Department of Physics, Institute of Technical Education & Research, Siksha ‘O' Anusandahan University, Jagamohan Nagar, Jagamara, Khandagiri, 751030, Bhubaneswar, India aut Choudhary R.N.P. Department of Physics, Institute of Technical Education & Research, Siksha ‘O' Anusandahan University, Jagamohan Nagar, Jagamara, Khandagiri, 751030, Bhubaneswar, India aut Journal of Electronic Materials Springer US; http://www.springer-ny.com 42/3(2013-03-01), 426-437 0361-5235 42:3<426 2013 42 11664 https://doi.org/10.1007/s11664-012-2376-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11664-012-2376-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Padhee R. Department of Physics, Institute of Technical Education & Research, Siksha ‘O' Anusandahan University, Jagamohan Nagar, Jagamara, Khandagiri, 751030, Bhubaneswar, India aut NATIONALLICENCE 700 1- Das Piyush Department of Physics, Institute of Technical Education & Research, Siksha ‘O' Anusandahan University, Jagamohan Nagar, Jagamara, Khandagiri, 751030, Bhubaneswar, India aut NATIONALLICENCE 700 1- Parida B.N. Department of Physics, Institute of Technical Education & Research, Siksha ‘O' Anusandahan University, Jagamohan Nagar, Jagamara, Khandagiri, 751030, Bhubaneswar, India aut NATIONALLICENCE 700 1- Choudhary R.N.P. Department of Physics, Institute of Technical Education & Research, Siksha ‘O' Anusandahan University, Jagamohan Nagar, Jagamara, Khandagiri, 751030, Bhubaneswar, India aut NATIONALLICENCE 773 0- Journal of Electronic Materials Springer US; http://www.springer-ny.com 42/3(2013-03-01), 426-437 0361-5235 42:3<426 2013 42 11664 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer