Percolation phenomena in explosive mechanochemical synthesis of some metal chalcogenides

Mechanochemical Reactions in the Sn–Zn–S System: Further Studies

“…The main "ndings of our experiments were the following: E The typical ignition times decreased from several hours to tens of minutes due to the more intense milling. E In powder mixtures with composition (1!x)(Sn#S)# x(Zn#S), combustive reaction was observed at any value of x, contrary to the earlier results (1).…”

“…Based on earlier "ndings and explanations (1,2), the following working model of the initiation of combustion is adopted: Ball milling initiates a self-sustaining process, if (i) the transfer of mechanical energy to the reactant mixture is capable of initiating the chemical reaction in the &&miniforg-ing'' (15) volume between the colliding tools (balls and the wall of the container) and (ii) the combustion wave is able to propagate through the rest of the reactant powder. The properties of the Sn#S and Zn#S reactions are quite di!erent from this respect.…”

Properties and Reactivity of Mechanochemically Synthesized Tin Sulfides*1

“…The application of mechanosynthesis using for high-energy grinding enables the mixing of components on the atomic level, a shift of the reaction regime from diffusion to kinetic or close to kinetic and a preparation of products with maximum interfacial area/total volume ratio (1)(2)(3). Since it is possible to study the progress of mechanosynthesis using various identification and/or analytical methods, it is also possible to prepare partially or totally synthesized tin sulfides with controlled structures (4)(5)(6)(7)(8)(9)(10)(11).…”

Self-sustaining reactions as a tool to study mechanochemical activation

“…Their results were published in a series of ve papers that still constitute one of the richest systematic investigations of an MSR system. [3][4][5][6][7] The rst paper 3 provides the earliest example of using the mill temperature to detect the ignition of a self-sustaining reaction. It contains ignition time results for 18 systems, sufficient to look for systematic trends.…”

“…5 In some mixed systems, such as (Sn-Zn) + S, a remarkable change of behaviour was observed as a function of composition. 7 When an equimolar mixture of Zn and S powders was milled, MSR was initiated aer some activation time. The same happened when a mixture of Sn and S powders was milled.…”