naa a22 4500 510803776 CHVBK 20180411083407.0 cr unu---uuuuu 180411e20131001xx s 000 0 eng 10.1007/s11664-013-2700-2 doi (NATIONALLICENCE)springer-10.1007/s11664-013-2700-2 Structural Properties and Ionic Conductivity of Nanocrystalline Zr5Ti7O24 Ceramic Synthesized by Autoignited Combustion Technique [Elektronische Daten] [Aneesh George, J.K. Thomas, Annamma John, Sam Solomon] Nanoparticles of Zr5Ti7O24 ceramic have been prepared by the autoignited combustion technique. The phase purity of the ceramic was examined by x-ray diffraction method, yielding lattice parameters of a=14.3Å, b=5.2Å, and c=5.1Å. A narrow size distribution of the nanoparticles was determined by transmission electron microscopy with a peak at 21.55nm. Coexistence of Zr/TiO6 octahedra and Zr/TiO4 tetrahedra was observed in the Raman spectrum. The optical bandgap of the ceramic was found to be 2.36eV. The sample was pressed into a circular pellet and sintered at 1490°C, obtaining 94.7% of theoretical density. The microstructure of the sintered pellet was analyzed by scanning electron microscopy, and the elemental composition was confirmed by energy-dispersive spectrometry. Impedance spectroscopic analysis of the sample showed that ions are the main source of conduction. Two semicircles in the Cole-Cole plot provide evidence of grain and grain boundary contributions to the conductivity. The total ionic conductivity of the sample was 5.57×10−1S/m at 700°C. The activation energies of grains and grain boundaries above 500°C were 1.08eV and 0.72eV, respectively. Nanocrystalline Zr5Ti7O24 ceramic is a promising material for use as an electrolyte in solid oxide fuel cells. TMS, 2013 Sintering nationallicence nanocomposites nationallicence ionic conductivity nationallicence fuel cells nationallicence George Aneesh Department of Physics, Mar Ivanios College, 695015, Thiruvananthapuram, India aut Thomas J.K. Department of Physics, Mar Ivanios College, 695015, Thiruvananthapuram, India aut John Annamma Department of Physics, Mar Ivanios College, 695015, Thiruvananthapuram, India aut Solomon Sam Department of Physics, Mar Ivanios College, 695015, Thiruvananthapuram, India aut Journal of Electronic Materials Springer US; http://www.springer-ny.com 42/10(2013-10-01), 2953-2960 0361-5235 42:10<2953 2013 42 11664 https://doi.org/10.1007/s11664-013-2700-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11664-013-2700-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- George Aneesh Department of Physics, Mar Ivanios College, 695015, Thiruvananthapuram, India aut NATIONALLICENCE 700 1- Thomas J.K. Department of Physics, Mar Ivanios College, 695015, Thiruvananthapuram, India aut NATIONALLICENCE 700 1- John Annamma Department of Physics, Mar Ivanios College, 695015, Thiruvananthapuram, India aut NATIONALLICENCE 700 1- Solomon Sam Department of Physics, Mar Ivanios College, 695015, Thiruvananthapuram, India aut NATIONALLICENCE 773 0- Journal of Electronic Materials Springer US; http://www.springer-ny.com 42/10(2013-10-01), 2953-2960 0361-5235 42:10<2953 2013 42 11664 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer