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Synthesis of Ce 0.8 Sm 0.2 O 1.9 solid electrolyte by a proteic sol‐gel green method
Author(s) -
Macedo Daniel A.,
Dutra Ricardo P. S.,
Nascimento Rubens M.,
Sasaki José M.,
Cesário Moisés R.,
Rajesh Surendran,
Figueiredo Filipe L.,
Marques Fernando M. B.
Publication year - 2016
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201600052
Subject(s) - crystallite , calcination , electrolyte , materials science , sol gel , conductivity , dielectric spectroscopy , fast ion conductor , grain size , chemical engineering , ceramic , scherrer equation , grain boundary , analytical chemistry (journal) , solid solution , mineralogy , chemistry , nanotechnology , composite material , microstructure , electrode , chromatography , organic chemistry , electrochemistry , catalysis , metallurgy , engineering
The present study reports the synthesis of Ce 0.8 Sm 0.2 O 1.9 solid electrolyte by a novel proteic sol‐gel method which uses gelatin as polymerizing agent. The as‐synthesized powder material was calcined at 700 °C for 2 h, with X‐ray diffraction revealing a single cubic phase with lattice parameter a = 0.5435 nm and theoretical density of 7.144 gcm ‐3 . The average crystallite size is 12 nm, as determined by the Scherrer equation. Impedance spectroscopy revealed a larger resistive contribution of the grain boundaries than that from grain bulk, which, due to its lower activation energy, tends to dominate the total conductivity above 650 °C. The total conductivity is in line with literature data for ceramics of the same composition prepared by various methods, thus confirming the potential of the proteic sol‐gel method as a green, low cost alternative synthetic route to prepare ceria‐based solid electrolytes.