[001] surface of P4W8O32 obtained by cleavage in UHV are analyzed at room temperature by UPS, LEED and STM. Two types of facets are revealed. The type I shows periodic parameters very close to the parameters of the bulk unit cell. It corresponds to a relaxed (1×1) surface, and the surface defects may produce a (3×1) reconstruction. The type II facets show a periodicity of 7.45 E, that is the distance between two second neighboring tungsten sites and corresponds to facets parallel (001)p, the dense planes of the perovskite-like WO6 octahedra slabs. This parameter reflects also the Width of the steps ending the WO6 octahedra slabs.
Characterization of cleaved surfaces of a monophosphate tungsten bronze / Guyot, H.; Motta, N.; Placidi, E.; Balaska, H.. - In: REVIEWS ON ADVANCED MATERIALS SCIENCE. - ISSN 1606-5131. - 8:1(2004), pp. 101-106.
Characterization of cleaved surfaces of a monophosphate tungsten bronze
Placidi E.;
2004
Abstract
[001] surface of P4W8O32 obtained by cleavage in UHV are analyzed at room temperature by UPS, LEED and STM. Two types of facets are revealed. The type I shows periodic parameters very close to the parameters of the bulk unit cell. It corresponds to a relaxed (1×1) surface, and the surface defects may produce a (3×1) reconstruction. The type II facets show a periodicity of 7.45 E, that is the distance between two second neighboring tungsten sites and corresponds to facets parallel (001)p, the dense planes of the perovskite-like WO6 octahedra slabs. This parameter reflects also the Width of the steps ending the WO6 octahedra slabs.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
