Crystal Structure of the Microwave Dielectric Resonator Ba2Ti9O20

摘要: A single-crystal X-ray study of dibarium nonatitanate, Ba2Ti9O20, yielded the triclinic space group P 1 with a=0.7471(1), b= 1.4081(2), c= 1.4344(2) nm, α=89.94(2)°, β= 79.43(2)°, γ= 84.45(2)°, V = 1.476 nm3 Z 4, and Dx= 4.61 Mg/m3. refinement atomic coordinates isotropic thermal parameters led to a residual 0.03. The structure consists hexagonally closest-packed layers Ba O atoms in sequence (hch)3. All Ti reside octahedral interstices this closest packing. various coordination octahedra share only edges corners each other. One-half is twelve-coordinated by oxygen atoms, other half eleven-coordinated.