کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1677610 1518346 2013 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Hydrogen analysis in APT: Methods to control adsorption and dissociation of H2
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
Hydrogen analysis in APT: Methods to control adsorption and dissociation of H2
چکیده انگلیسی

Experimental factors that influence adsorption of hydrogen from the residual gas on a nickel-rich alloy during atom probe tomography are investigated. The rate of adsorption has a maximum value at field strengths between 24 and 26 V/nm. It is found that by selecting sufficiently high laser energies, or alternatively high DC fields, it is possible to significantly reduce adsorbed quantities. Some of the physical mechanisms for hydrogen supply to the analyzed area of the tip are discussed, and it is concluded that the dominating supply mechanism is most likely direct adsorption from the gas phase. Low hydrogen adsorption at high fields is attributed to autoionization, and a decline at low fields is explained by reduced field adsorption.


► Hydrogen adsorption during atom probe analysis has been studied.
► Supply of hydrogen can be reduced by promoting autoionization through high DC fields.
► The adsorption mechanism is concluded to be field adsorption.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ultramicroscopy - Volume 132, September 2013, Pages 285–289
نویسندگان
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