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Влияние атмосферного кислорода на состав и кинетические свойства тонких плёнок висмута

Влияние атмосферного кислорода на состав и кинетические свойства тонких плёнок висмута

Abstract

Методами рентгеновской фотоэлектронной спектроскопии и измерения электрических и гальваномагнитных свойств исследовано влияние атмосферного кислорода на состав и свойства плёнок висмута толщиной d = 10-200 нм. Свойства двух серий свежеприготовленных плёнок (с защитным покрытием EuS и без защитного покрытия) сравнивались с характеристиками этих плёнок после длительного (в течение 9 лет) пребывания на воздухе при комнатной температуре. Установлено, что в плёнках Bi без покрытия имеет место неравномерное по глубине окисление с образованием оксида висмута Bi₂O₃. При этом значения коэффициента Холла Rн и магнетосопротивления Δρ/ρ, а также их температурные зависимости практически не изменяются после пребывания в воздушной атмосфере, а электропроводность σ снижается и тем значительнее, чем тоньше плёнка. С другой стороны, после длительного пребывания на воздухе в плёнках, покрытых сульфидом европия, Bi присутствует только в металлическом состоянии, а σ, Rн и Δρ/ρ остаются практически неизменными. Из полученных результатов следует, что при наличии защитного покрытия даже очень длительное пребывание на воздухе при комнатной температуре не приводит к изменению химического состава и кинетических свойств плёнок висмута. The effect of air oxidation on the composition and properties of bismuth films with thicknesses d = 10-200 nm is studied by using X-ray photoelectron spectroscopy and measuring electrical and galvanomagnetic properties of the films. The properties of two sets of freshly prepared films (with a protective EuS layer and without it) are compared with the properties of the same films after long-term air storage (during 9 years) at room temperature. As determined, a non-uniform in depth oxidation with the Bi₂O₃ formation takes place in the Bi films without protective covering. At the same time, the values of the Hall coefficient RH and magnetoresistance Δρ/ρ as well as their tempera-ture dependences are not practically changed after air storage, whereas elec-trical conductivity σ is decreased. For the thinner films, the more significant decrease in σ is observed. On the other hand, after long-term air storage, in the films covered by europium sulphide, Bi is presented only in the metallic state, and σ, RH and Δρ/ρ remain practically changeless. As follows from the obtained results, in the case of presence of the protective covering, even long-term air storage at room temperature does not lead to a change either in the chemical composition or in the kinetic properties of bismuth films.

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Keywords

оксид висмута, X-ray photoelectron spectroscopy, electrical conductivity, oxidation, магнетосопротивление, bismuth films, плёнки висмута, bismuth oxide, Hall coefficient, рентгеновская фотоэлектронная спектроскопия, коэффициент Холла, электро-проводность, magnetoresistance, окисление

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
Green