New oxide-ion conductor Ho-2(Ti1.904Ho0.096)O-6.952: structure and conductivity
authors Abrantes, JCC; Savvin, SN; Shlyakhtina, AV; Shcherbakova, LG; Nunez, P
nationality International
journal JOURNAL OF CRYSTAL GROWTH
author keywords Defects; Oxides; Titanium compounds; Ionic conductors; Fuel cells
keywords RESISTIVE GRAIN-BOUNDARIES; YB2+XTI2-XO7-X/2 MATERIALS; IMPEDANCE; GD2TI2O7; LU
abstract The crystal structure and conductivity of pyrochlore-like Ho-2(Ti2-xHox)O7-x/2 (x=0, 0.01, 0.02, 0.096) ceramics are studied by X-ray diffraction and impedance spectroscopy as a function of temperature and oxygen partial pressure in the temperature range 700-1000 degrees C. According to the Rietveld refinement data the fraction of cation anti-site pairs in Ho-2(Ti1.904Ho0.096)O-6.952 sintered at 1400 and 1600 degrees C is 1.5% and 4.3% respectively. Heat treatment of Ho-2(Ti1.904Ho0.096)O-6.952 between 1400 and 1600 degrees C was shown to lead to the formation of pyrochlore-like solid solutions with pure oxide ion conductivities of about 4 x 10(-4) and 1.5 x 10(-3) S/cm at 800 degrees C, respectively. The ionic transport number is similar to 1 at 800 degrees C and Po-2 > 10(-5) Pa. The electrolyte domain was observed for a wide range of oxygen partial pressures (10(-5) Pa > Po-2 > 10(5) Pa), which turns the Ho-2(Ti1.904Ho0.096)O-6.952 ceramic into a typical member of the LANTIOX family, with good oxide ion conductivity. (C) 2010 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0022-0248
year published 2011
volume 318
issue 1
beginning page 966
ending page 970
digital object identifier (doi) 10.1016/j.jcrysgro.2010.10.016
web of science category Crystallography; Materials Science, Multidisciplinary; Physics, Applied
subject category Crystallography; Materials Science; Physics
unique article identifier WOS:000289653900211
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