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 {HEAD ~ the ion radius} of hafnium and that of {TAIL ~ zirconium} is stabilized by adjusting the content of hafnium within the above range 
of
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 { HEAD ~ the ion radius } of hafnium and that of { TAIL ~ zirconium } is stabilized by adjusting the content of hafnium within 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 HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH