#Barium Aluminum Titanium Oxide #Tetragonal, I4/m (87), Z = 1. The compound is of the hollandite structure type. Its #unit cell was determined by Roth [1981] on the basis of a related hollandite type #phase, whose structure was determined by Sinclair et al. [1980]. #Lattice constants of this sample #a = 9.9619(5), c = 2.9242(3) #c/a = 0.2935 #Volume 290.20 A 3 4.973 3.524 3.153 2.805 2.490 2.445 2.228 2.194 2.0082 1.9542 1.8629 1.7603 1.7084 1.6602 1.6462 1.5748 1.5631 1.4618 1.4317 1.4288 1.4087 1.4030 1.3736 1.3260 1.3239