naa a22 4500 510804527 CHVBK 20180411083410.0 cr unu---uuuuu 180411e20130801xx s 000 0 eng 10.1007/s11664-013-2637-5 doi (NATIONALLICENCE)springer-10.1007/s11664-013-2637-5 Dielectric and Pyroelectric Properties of La- and Pr-Modified Tungsten-Bronze Ferroelectrics [Elektronische Daten] [B. Parida, Piyush Das, R. Padhee, R. Choudhary] The polycrystalline materials Li2Pb2R2W2Ti4Nb4O30 (R=La, Pr) of the tungsten-bronze structural family have been synthesized using a high- temperature mixed-oxide method. Room-temperature x-ray diffraction (XRD) analysis confirms the formation of single-phase compounds. Room-temperature scanning electron micrography of the pellet samples shows a uniform distribution of well-defined different sizes of grains on the surface of the samples, confirming the formation of single-phase compounds. Study of the frequency and temperature dependence of the dielectric constant and loss tangent suggests the existence of dielectric dispersion in the materials. The ferroelectric phase transition in the samples has been studied based on the variation of fitting parameters (calculated from a theoretical model) with temperature. Studies of pyroelectric properties [figure of merit (FOM) and coefficient] show that the materials have reasonably high FOM useful for pyroelectric detectors. The variation of alternating-current (AC) and direct-current (DC) conductivity with inverse absolute temperature (obtained from dielectric data) follows a typical Arrhenius relation. The low leakage current and negative temperature coefficient of resistance behavior of the samples have been verified from J-E plots. TMS, 2013 Ceramics nationallicence dielectric properties nationallicence ferroelectricity nationallicence phase transition nationallicence powder diffraction nationallicence Parida B. Department of Physics Institute of Technical Education & Research, Siksha O Anusandhan University, Jagmohan Nagar, Jagamara, 751030, Bhubaneswar, India aut Das Piyush Department of Physics Institute of Technical Education & Research, Siksha O Anusandhan University, Jagmohan Nagar, Jagamara, 751030, Bhubaneswar, India aut Padhee R. Department of Physics Institute of Technical Education & Research, Siksha O Anusandhan University, Jagmohan Nagar, Jagamara, 751030, Bhubaneswar, India aut Choudhary R. Department of Physics Institute of Technical Education & Research, Siksha O Anusandhan University, Jagmohan Nagar, Jagamara, 751030, Bhubaneswar, India aut Journal of Electronic Materials Springer US; http://www.springer-ny.com 42/8(2013-08-01), 2587-2594 0361-5235 42:8<2587 2013 42 11664 https://doi.org/10.1007/s11664-013-2637-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11664-013-2637-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Parida B. Department of Physics Institute of Technical Education & Research, Siksha O Anusandhan University, Jagmohan Nagar, Jagamara, 751030, Bhubaneswar, India aut NATIONALLICENCE 700 1- Das Piyush Department of Physics Institute of Technical Education & Research, Siksha O Anusandhan University, Jagmohan Nagar, Jagamara, 751030, Bhubaneswar, India aut NATIONALLICENCE 700 1- Padhee R. Department of Physics Institute of Technical Education & Research, Siksha O Anusandhan University, Jagmohan Nagar, Jagamara, 751030, Bhubaneswar, India aut NATIONALLICENCE 700 1- Choudhary R. Department of Physics Institute of Technical Education & Research, Siksha O Anusandhan University, Jagmohan Nagar, Jagamara, 751030, Bhubaneswar, India aut NATIONALLICENCE 773 0- Journal of Electronic Materials Springer US; http://www.springer-ny.com 42/8(2013-08-01), 2587-2594 0361-5235 42:8<2587 2013 42 11664 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer