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• 09:05, 15 October 2024 Schlipf talk contribs created page Construction:Structure optimization (Created page with "=== RMM-DIIS ({{TAG|IBRION}}=1) === For {{TAG|IBRION}}=1, a quasi-Newton (variable metric) algorithm is used to relax the ions into their instantaneous groundstate. The forces and the stress tensor are used to determine the search directions for finding the equilibrium positions (the total energy is not taken into account). This algorithm is very fast and efficient close to local minima, but fails badly if the initial positions are a bad guess (use {{TAG|IBRION}}=2 in t...")