Sorry, but there may have been some misunderstanding. Si4S is not a recognized chemical formula. “Si” represents silicon, a chemical element with an atomic number of 14. Meanwhile, “S” represents sulfur, a chemical element with an atomic number of 16. However, Si4S is not a chemical compound that can exist.
Silicon and sulfur can form various compounds such as SiS2 (silicon disulfide), but there is no Si4S. Therefore, it is not possible to provide detailed information about the properties, chemical equations, or synthesis methods of Si4S.
This could be a misunderstanding or an error in entering the formula, so if you have other information or questions about another chemical compound, I am more than happy to assist.