The most common form of ordering leads to an alternating arrangement of cations on these sites and so results in a rock-salt type face-centred cubic (fcc) substructure. There is considerable interest in such cation ordering as the fcc lattice contains nearest neighbouring cations arranged on ...
This is due to the excessive content of Ta5+ ions, which exceeds the solid solution limit of the RNb2O6 lattice, allowing the Ta5+ in the system to form the RTa2O6 phase independently. When x = 0.75–1, the position of the main peak of RTa2O6 increases with the value of x ...
as shown in K. The ammonia desorbs form the catalytic site in a high barrier process, indicating that the catalytic site may be poisoned by adsorbed ammonia. The details of all the activation barriers are shown inFigure 4and it generally appears that the tantalum nitride catalyst is less reac...
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