▁methods ▁results ▁with ▁simulations ▁( e . g . ▁mult is lice ) ▁and ▁iter atively ▁ref ining ▁the ▁solution ▁can ▁lead ▁to ▁the ▁ab ▁init io ▁determ ination ▁of ▁the ▁cry stal ▁structure . ▁ ▁The ▁P ED ▁technique ▁has ▁been ▁used ▁to ▁determine ▁the ▁cry stal ▁structure ▁of ▁many ▁classes ▁of ▁materials . ▁Initial ▁investig ations ▁during ▁the ▁emer gence ▁of ▁the ▁technique ▁focused ▁on ▁complex ▁ox ides ▁and ▁n ano - pre cip it ates ▁in ▁Al umin um ▁allo ys ▁that ▁could ▁not ▁be ▁resolved ▁using ▁x - ray ▁diff raction . ▁Since ▁becoming ▁a ▁more ▁w ides p read ▁cry stal log raph ic ▁technique , ▁many ▁more ▁complex ▁metal ▁ox ide ▁structures ▁have ▁been ▁solved . ▁ ▁Ze ol ites ▁are ▁a ▁techn olog ically ▁valuable ▁class ▁of ▁materials ▁that ▁have ▁histor ically ▁been ▁difficult ▁to ▁solve ▁using ▁x - ray ▁diff raction ▁due ▁to ▁the ▁large ▁unit ▁cells ▁that ▁typically ▁occur . ▁P ED ▁has ▁been ▁demonstrated ▁to ▁be ▁a ▁vi able ▁alternative ▁to ▁solving ▁many ▁of ▁these ▁structures , ▁including ▁the ▁Z SM - 1 0 , ▁MC M - 6 8 , ▁and ▁many ▁of ▁the ▁IT Q - n ▁class ▁of ▁ze ol ite ▁structures . ▁ ▁P ED ▁also ▁enables ▁the ▁use ▁of ▁electron ▁diff raction ▁to ▁investigate ▁beam - sens itive ▁organ ic ▁materials . ▁Because ▁P ED ▁can ▁reproduce ▁symmetric ▁zone ▁axis ▁diff raction ▁patterns ▁even ▁when ▁the ▁zone ▁axis ▁is ▁not ▁perfectly ▁aligned , ▁it ▁enables ▁information ▁to ▁be