In particular, since the valencies of 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 {HEAD ~ hafnium} within {TAIL ~ the above range} 
In particular , since the valencies of 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 { HEAD ~ hafnium } within { TAIL ~ the above range }
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 OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL