One type of AlO4 tetrahedron with four completely different Al-O bond lengths has larger distortion, and the other type of AlO4 tetrahedron with smaller distortion has two Al-O bond lengths the same.
One kind of alo4 tetrahedron with completely different Al-O bond lengths has large distortion, and the other kind of alo4 tetrahedron with small distortion has two Al-O bond lengths,.
One type of AlO4 tetrahedron with four completely different Al-O bond lengths is distorted greatly, and the other type of AlO4 tetrahedron with less distortion has two Al-O bond lengths that are the same.