کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1672323 | 1518086 | 2007 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Cu2Te synthesis and in-vacuum thermal decomposition: Chemical-kinetics analysis and comparison to equilibrium vapor-pressure measurements Cu2Te synthesis and in-vacuum thermal decomposition: Chemical-kinetics analysis and comparison to equilibrium vapor-pressure measurements](/preview/png/1672323.png)
In this study, polycrystalline Cu-foil substrates are exposed to elemental Te vapor at substrate temperatures below 373 K. Auger electron spectroscopy measurements indicate that copper-telluride films are formed at the substrate surface that have a 2:1 Cu-to-Te ratio, as predicted by the Cu–Te phase diagram. When these films are annealed above about 700 K in vacuum, Te desorbs from the substrate with zero-order kinetics. An analysis of Te-desorption traces that assumes the reaction Cu2Te(s) → 2Cu(s) + αTe(ν) + 1/2(1 − α)Te2(ν) finds a thermal-decomposition activation energy of 217 ± 3 kJ mol− 1. These Te-desorption data are compared to the Te impingement rate calculated from Cu2Te equilibrium vapor-pressure data from the literature and found to be in excellent agreement.
Journal: Thin Solid Films - Volume 515, Issues 20–21, 31 July 2007, Pages 7886–7891