Mechanism of thermal decomposition of lead thiosulphate |
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Authors: | S Mamylov O Lomovsky V Boldyrev |
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Institution: | (1) Institute of Solid-State Chemistry, 630091 Novosibirsk, U. S. S. R. |
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Abstract: | The thermal decomposition of lead thiosulfate (LTS) was studied by various methods: X-ray phase analysis, IR and ESR spectroscopy, etc. A mechanism of thermal decomposition is suggested, including rupture of the S-S bond and the formation of radicals. According to the mechanism, the reaction rate can be enhanced in the presence of the PbS phase. The formation of PbS is the cause of the topochemical character of the reaction. The composition of the thermolysis products of LTS containing a radioactive isotope of sulfur is predicted.
Zusammenfassung Die thermische Zersetzung von Bleithiosulfat PbS2O3 wurde durch Röntgenphasenanalyse, IR- und ESR-Spektroskopie und Thermogravimetrie untersucht. Ein Mechanismus der thermischen Zersetzung wird angegeben, der über die Trennung von S-S-Bindungen und die Bildung von Radikalen verläuft. Nach diesem Mechanismus wird die Reaktionsgeschwindigkeit in Gegenwart der PbS-Phase beschleunigt, was den topochemischen Charakter der Reaktion bedingt.Für die Verteilung radioaktiven Schwefels auf die Zersetzungsprodukte unterschiedlich markierten (PbS*SO3 bzw. PbSS*O3) Bleithiosulfats wird eine Vorhersage gemacht.
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![icy](/content/k8m03h24n4411663/xxlarge1080.gif) ![ncy](/content/k8m03h24n4411663/xxlarge1085.gif) ![tscy](/content/k8m03h24n4411663/xxlarge1094.gif) , ![scy](/content/k8m03h24n4411663/xxlarge1089.gif) ![ocy](/content/k8m03h24n4411663/xxlarge1086.gif) ![dcy](/content/k8m03h24n4411663/xxlarge1076.gif) ![iecy](/content/k8m03h24n4411663/xxlarge1077.gif) ![rcy](/content/k8m03h24n4411663/xxlarge1088.gif) ![zhcy](/content/k8m03h24n4411663/xxlarge1078.gif) ![acy](/content/k8m03h24n4411663/xxlarge1072.gif) ![shchcy](/content/k8m03h24n4411663/xxlarge1097.gif) ![icy](/content/k8m03h24n4411663/xxlarge1080.gif) ![rcy](/content/k8m03h24n4411663/xxlarge1088.gif) ![acy](/content/k8m03h24n4411663/xxlarge1072.gif) ![dcy](/content/k8m03h24n4411663/xxlarge1076.gif) ![icy](/content/k8m03h24n4411663/xxlarge1080.gif) ![ocy](/content/k8m03h24n4411663/xxlarge1086.gif) ![acy](/content/k8m03h24n4411663/xxlarge1072.gif) ![kcy](/content/k8m03h24n4411663/xxlarge1082.gif) 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