AlCaO5Ta
Sales, M.Eguia, G.Quintana, P.Torres-Martinez, L. M.West, A. R.
Journal of Solid State Chemistry (1999) 143, 62-68
a=6.6760Å b=8.9546Å c=7.3494Å
α=90.000° β=114.098° γ=90.000°
AlCa2O6Ta
a=5.3915Å b=5.4321Å c=7.6508Å
α=90.000° β=90.076° γ=90.000°