Optimised NASICON Ceramics for Na(+) Sensing
authors Fuentes, RO; Figueiredo, F; Marques, FMB; Franco, JI
nationality International
journal IONICS
abstract NASICON dense ceramics were obtained from solid state reaction between SiO(2), Na(3)PO(4)center dot 12H(2)O and two different types of zirconia: monoclinic ZrO(2) and the yttria-doped tetragonal phase (ZrO(2))(0.97)(Y(2)O(3))(0.03). Higher temperatures were needed to obtain dense samples of the yttrium free composition (1265 degrees C) The electrical conductivity, at room temperature, of the yttria-doped samples sintered at 1230 degrees C (0.20 S/m) is significantly higher than the value obtained with the material prepared from pure ZrO(2). The impedance spectra show that the differences in conductivity are predominantly due to the higher grain boundary resistance of the undoped ceramics, probably due to formation of monoclinic zirconia and glassy phases along the grain boundary. Further improvement of the electrical conductivity could be achieved after optimization of the grain size and density of grain boundaries. A maximum conductivity value of about 0.27 S/m at room temperature was obtained with the yttria-doped samples sintered at 1220 degrees C for 40 h. Yttria-doped and undoped ceramics were tested as Na(+) potentiometric sensors. The detection limit of the yttria-doped sample (10(-4) mol/l) was one order of magnitude lower than the obtained with the undoped material.
issn 0947-7047
year published 2002
volume 8
issue 5-6
beginning page 383
ending page 390
digital object identifier (doi) 10.1007/BF02376051
web of science category Chemistry, Physical; Electrochemistry; Physics, Condensed Matter
subject category Chemistry; Electrochemistry; Physics
unique article identifier WOS:000208029200008
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