Citation: Grey, I.E.; Planes, J.; Roth, R.S.; Mumme, W.G.; Chenavas, J.; Bendersky, L.A.; Li, C. (2001). Characterization of new 5M and 7M polytypes of niobia-doped Ca2 Ta2 O7. Journal of Solid State Chemistry, 161, pp. 274-287.
Formula: Ca2 O7 Ta2
Chemical name: Ca2 (Ta2 O7)
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: O196 Ta56 (O7 Ta2)
Multiplicity: 1