In particular, since the valencies of {HEAD ~ zirconium} and hafnium are both constant at 4, the crystal structure of the composite oxide obtained due to the difference between the ion radius of hafnium and that of zirconium is stabilized by adjusting the content of hafnium within {TAIL ~ the above range} 
In particular , since the valencies of { HEAD ~ zirconium } and hafnium are both constant at 4 , the crystal structure of the composite oxide obtained due to the difference between the ion radius of hafnium and that of zirconium is stabilized by adjusting the content of hafnium within { TAIL ~ the above range }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD 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 OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL