BiMnO3 (BMO), ferromagnetic (FM) below Tc 100 K, was believed to also be ferroelectric (FE) due to a noncentrosymmetric C2 structure, until diffraction data indicated that its space group is the centrosymmetric C2/c. Here we present infrared phonon spectra of BMO, taken on a mosaic of single crystals, which are consistent with C2/c at any T >10 K, as well ... إقراء المزيد