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Different types of N-ordering assigned to the -phase in the system Fe/N, -Fe 3 N 1+x , serve as prototypes for the very common so-called '' -type'' occupational ordering of interstitials: in hexagonal interstitial compounds MX y with y=<0.5 and M in an hcp arrangement with X in octahedral interstices, ordering of X leads to a 3 1/2 x3 ...
A laboratory set-up for the photocatalytic degradation of NH 3 /NH 4+ was designed. It includes a tube reactor (volume 12.3 ml) and a Xe-lamp (α > 300 nm) as irradiation source. Suspended TiO 2 powder was used as photocatalyst. For the on-line determination of NH 3 a gas-sensing probe was shown to be useful down to the lower mg/l level (detection limit: 2.2...
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