1 - 10 of 22 articles
The concept of bond valence (BV) is widely used in crystal chemical considerations, e.g. to assess equilibrium positions of atoms in crystal structures from an empirical relationship between bond lengthR
and bond valenceS
) /b] as sites where the BV sumV(A)=∑ s...
Electrochemical methods have been used to study hydrogen in vanadium, titanium and three binary magnesium alloy systems. These materials are all sensitive to air and/or water, which prohibits the use of aqueous electrolytes. The measurements have involved the use of alkali halide and lower...
The present work describes the electrical conductivity of undoped CaTiO3 in terms of the electrical conductivity components corresponding to electrons, electron holes and ionic charge carriers in the temperature range 973 K — 1323 K and under controlled oxygen partial pressure (10 Pa — 72 kPa)....
A mathematical model is presented for a thin film, spherical and cylindrical particles electrodes under galvanostatic discharge. The model available to simulate the electrochemical behavior is discussed considering not only their electrochemical representation (transport phenomena), but also the...
Apatite-type oxides have been attracting interest as a new class of oxide ion conductors. In this paper we examine the effect of Ga doping on the conductivity of the apatite silicate system, Nd9.33+xSi6O26+3x/2 and compare the results to those reported for similar doping studies in...
The principle and availability of Neutron Radiography are demonstrated. The technique is actually applied to obtain the images as to lithium in the oxide lithium ion conductors and/or hydrogen in the hydrogen storage alloys. From analysis of the lithium or hydrogen distribution, the ionic...
For the in situ measurement of the free oxygen concentration and the equilibrium oxygen partial pressure oxygen sensors based on zirconia solid electrolytes are widely used in order to monitor and control technical high temperature processes. Similarly combustibles (HC, CO) and NOx can be...
Perovskite-related phases derived from SrFeO3-δ are among known mixed conductors with highest oxygen permeability and are thus of interest as the ceramic membrane materials for oxygen separation and partial oxidation of light hydrocarbons. Dense ceramics of SrFe1-xAlxO3-δ (x=0.1–0.5) were...
Among the trivalent ion conductors reported, the highest ion conductivity was realized with the trivalent Al3+ ion conducting (AlxZr1−x)4/(4−x)Nb(PO4)3 solid electrolyte and the value enters into the region between yttria stabilized zirconia (YSZ) and calcia stabilized zirconia (CSZ) that are...
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