Gradual and Combustive Mechanochemical Reactions in the Sn–Zn–S System

✍ Scribed by L. Takacs; M.A. Susol

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 221 KB
• Volume: 121
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1996.0053

✦ Synopsis

When a mixture of reactant powders A and B is milled, The mechanochemical formation of ZnS from a mixture of a mechanochemical reaction can be induced whenever an Zn and S powders turns into a self-propagating thermal reac-A-B interface is compressed between two colliding balls tion after 30 min of milling. A similar ''explosion'' occurs when or a ball and the wall of the container. The reaction results Sn and S are milled for about the same time to form SnS 2 . in local heating around the reaction zone. If, as a conse-However, the ignition time is longer or the reaction is gradual quence, the temperature at a nearby A-B interface exin mixtures of the two systems. This phenomenon is investigated ceeds a critical value, T crit , the reaction is initiated there as a function of composition. A model is proposed based on as well. Additional heat is released and the process escathe thermodynamic properties and mechanochemical reactions lates into self-propagating combustion (19,21).

of the binary systems.