Реферат: For the first time, the initial stages of the uptake of hydrogen by palladium metal have been studied on a microscopic scale. A novel technique for the production of stable, clean Pd tips of small radius (∼2000 Å) has enabled field emission microscopy (FEM, resolution ∼20 Å) to be successfully applied. Exposure of Pd to H2 at low temperatures led to an increase in emission starting at highly open surfaces present on the tip. This has been interpreted as both the formation of subsurface H, and the formation of extruding PdH particles on top of the Pd tip. Growth of these particle proceeds in a staccato manner. Heating of the tip after saturation leads to a change in emission distribution over the tip, a black wave that engulfs the whole surface followed by an increase in emission, that is possibly related to a phase transition from β-PdH to a mixture of α- and β-PdH (the so-called βmin transition). When most of the hydrogen has been removed from the sample by heating in vacuum, Pd crystallites remain on the surface. They are fairly stable up to high temperatures of ∼700 K at which they melt back into the bulk of the tip.

Библиографическая ссылка: Cobden P.D. , Gorodetskii V.V. , Nieuwenhuys B.E.
Field Emission Microscope Study of the Initial Behaviour of the Palladium-Hydrogen System at Low Temperatures
Surface Science. 1999. V.432. N1. P.61-68. DOI: 10.1016/S0039-6028(99)00509-9 WOS Scopus РИНЦ CAPlusCA OpenAlex Sciact

Даты:

Поступила в редакцию:	4 дек. 1998 г.
Принята к публикации:	29 мар. 1999 г.
Опубликована online:	8 июл. 1999 г.
Опубликована в печати:	9 июл. 1999 г.

Идентификаторы БД:

Web of science:	WOS:000081566700009
Scopus:	2-s2.0-0032676559
РИНЦ:	13929832
Chemical Abstracts:	1999:527490
Chemical Abstracts (print):	131:232045
OpenAlex:	W1983149731
Sciact:	11309

Цитирование в БД:

БД	Цитирований
OpenAlex	9

Альметрики: