Citation: Grey, I.E.; Chenavas, J.; Mumme, W.G.; Roth, R.S.; Bendersky, L.A.; Planes, J.; Li, C. (2001). Characterization of new 5M and 7M polytypes of niobia-doped Ca2 Ta2O7. Journal of Solid State Chemistry, 161, pp. 274-287.
Formula: Ca2 Nb0.1 O7 Ta1.9
Chemical name: Ca2 (Ta1.9 Nb0.1) O7
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Ca4 Nb56 O196 Ta56 (Ca Nb14 O49 Ta14)
Multiplicity: 1