In particular, since the valencies of zirconium and hafnium are both constant at 4, {HEAD ~ 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 {TAIL ~ the content} of hafnium within the above range 
In particular , since the valencies of zirconium and hafnium are both constant at 4 , { HEAD ~ 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 { TAIL ~ the content } of hafnium within the above range
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