Shapes of the noncentrosymmetric TeO₅E groups in tellurite glasses with P₂O₅ additions

Abstract The noncentrosymmetric shapes of the TeO n E units ( = 3, 4, and 5) are important for nonlinear optical properties tellurite glasses (E – lone pair). An earlier diffraction work on binary (TeO 2 ) 1− x (P O 5 reported Te−O coordination numbers larger than four, which means rare case proportions units. distributions distances in these differ from those known related crystal structures. so far unknown determined by use a mechanical analog. Five steel balls can move freely spherical bowl. Under effect gravity, they take structure that is equivalent to five oxygen ligands unit. average bond lengths groups obtained little this small differences attributable variations based uneven tensions caused network disorder. analog was set up basis present conceptions pair’s steric effects. ratio ball’s bowl’s diameters taken published analyses