Zr is hosted onto one every three cation layer (Zr site approaches eightfold coordination) so that the parameter
a is threefold (cell setting: a b c ¼ 14:4 5:3 5:0A˚ ) as consistent with the fersmite-type structure AB2O6; in
this case the formula is close to ZrTi2O6 (Zr:Ti ¼ 1:2; XTi ¼ 0:67) [3] but the same structure also occurs in
Zr5Ti7O24 (Zr:Ti ratio ¼ 1:1.4) [7].