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Fourier transform infrared (FTIR) and Ultraviolet–Visible (UV-VIS) spectroscopic studies have been employed to investigated the samples from the (Er₂O₃)_x·(B₂O₃)_(60-x)·(ZnO)₄₀ (0 ≤ x ≤ 10 mol%) glass ceramic system. FTIR data show that the glass ceramic network structure consists on the BO₃, BO₄ and ZnO₄ structural units, and the conversion among these units mainly depends on the Er₂O₃ content. The optical absorption spectra of studied samples were recorded in the spectral range from 200 to 900 nm at room temperature. The optical band gap energy for the studied glass ceramics were calculated from the optical absorption spectra.

Keywords: Zinc borate glass ceramics; Er₂O₃; FTIR; Optical properties.