While {TAIL ~ the relative chemical simplicity} of these prototypical intermetallic clathrates is ideal for understanding clathrate structure property relationships, synthesis in the binary Na—Si system has historically been complicated by the simultaneous formation of {HEAD ~ the two different structure types} , which are characterized by nearly identical compositions 
While { TAIL ~ the relative chemical simplicity } of these prototypical intermetallic clathrates is ideal for understanding clathrate structure property relationships , synthesis in the binary Na — Si system has historically been complicated by the simultaneous formation of { HEAD ~ the two different structure types } , which are characterized by nearly identical compositions
OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH