“…Many tellurium(IV) oxides have non-centrosymmetric structures and thus were studied for their interesting physical properties. This is the case of MTeO 3 oxides with M = Ca, Sr, Ba, Zn, Cd, Hg, Pb, Ni, which show nonlinear optical properties, , and of oxides such as CaTeO 3 and SrTeO 3 , which are ferroelectrics. , Moreover, the two latter compounds exhibit numerous polymorphs, whose structures have just recently been solved. For CaTeO 3 and SrTeO 3 three and four polymorphs have been reported, respectively.…”