Structure-property correlations in tellurite glasses via TeO2/GeO2 substitution: a route to optical bandgap tuning.
CALDERÓN, Gaston Lozano; SILVA, Victor Murilo Poltronieri da; RIVERA, Victor Anthony Garcia; MANZANI, Danilo.
CALDERÓN, Gaston Lozano; SILVA, Victor Murilo Poltronieri da; RIVERA, Victor Anthony Garcia; MANZANI, Danilo.
Abstract: Engineering the bandgap of photonic materials is crucial for advancing integrated photonics hybrid devices. Tellurite glasses are promising materials due to their exceptional optical properties. Here, we demonstrate a linear correlation between GeO2 content (0-15 mol%) and the optical bandgap in germano-tellurite glasses. A similar monotonic trend is observed in the Raman bands ratio associated with TeO4 and TeO3/TeO3+1 units. These structure-property relationships arise from the isovalent substitution of Te4+ and Ge4+ (introduced as TeO2 and GeO2) combined with the controlled synthesis conditions employed. The incorporation of GeO2 leads to an increase in the glass transition temperature, whereas the density decreases. This behaviour is mainly attributed to the formation of extended GeO4 ring structures, restructuring of the glass network, and the dissociation energy of Ge - O bonds. These findings establish a clear and predictable pathway for engineering both the optical and structural properties of germano-tellurite glasses through compositional control.
@article={003299344,author = {CALDERÓN, Gaston Lozano; SILVA, Victor Murilo Poltronieri da; RIVERA, Victor Anthony Garcia; MANZANI, Danilo.},title={Structure-property correlations in tellurite glasses via TeO2/GeO2 substitution: a route to optical bandgap tuning},journal={Ceramics International},note={v. 52, n. 11, Part B, p. 17473-17480},year={2026}}