While {HEAD ~ the relative chemical simplicity} of {TAIL ~ 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 the two different structure types , which are characterized by nearly identical compositions 
While { HEAD ~ the relative chemical simplicity } of { TAIL ~ 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 the two different structure types , which are characterized by nearly identical compositions
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