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- W2055930168 abstract "A simple ellipsometer and an inexpensive 13-MHz sputteretch assembly have been used with a conventional evaporator to make in, situ measurements of the growth of thin oxide layers (≤ 10 nm) on pure lead and pure indium films, and also on a series of alloy films containing up to 46 at % In. Our lead results agree with results of earlier workers. For pure indium, we find that equilibrium oxide thicknesses are typically smaller than for lead, and that equilibrium time constants are longer; moreover, increased RF power leads to increased, rather than decreased, oxide thicknesses. Alloy films show an intermediate behavior in general, but in the range 26-36 at % In the oxide thickness rises to a maximum before falling to its equilibrium value. We agree with results obtained by other methods of oxidation and analysis which show the oxide to have a disproportionately large In <inf xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</inf> O <inf xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>3</inf> content, and, in particular, that there is 100 percent In <inf xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</inf> O <inf xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>3</inf> for all alloys containing more than 35 at % In. We show that the difference between PbO and In <inf xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</inf> O <inf xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>3</inf> as regards the dependence of oxide thickness on RF power can be accounted for by slightly modifying the oxide growth model of Greiner, to make the diffusion length of oxygen ions very slightly dependent on RF voltage. To account for the intermediate behavior, we introduce a simple coupled Greiner model involving separate columns of two oxides, in which oxygen ions can interdiffuse between columns as they find their way to the alloy surface. As the parameters of the model are changed, the growth behavior changes from a simple monotonic growth of thickness with time, through a behavior in which there is an intermediate maximum, and then back to a monotonic growth behavior again." @default.
- W2055930168 created "2016-06-24" @default.
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- W2055930168 date "1980-10-01" @default.
- W2055930168 modified "2023-09-27" @default.
- W2055930168 title "An ellipsometric study of the RF sputter oxidation of lead—indium alloys" @default.
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- W2055930168 doi "https://doi.org/10.1109/t-ed.1980.20136" @default.
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