Citation: Grey, I.E.; Roth, R.S. (2000). New calcium tantalate polytypes in the system Ca2 Ta2 O7 Sm2 Ti2 O7. Journal of Solid State Chemistry, 150, pp. 167-177.
Formula: Ca1.89 O7 Sm0.16 Ta1.86 Ti0.1
Chemical name:(Ca1.89 Sm0.11) (Ta1.86 Sm0.05 Ti0.10) O7