Dresden 2026 – scientific programme
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FM: Fachverband Funktionsmaterialien
FM 7: Crystal Defects and Real Structure Physics in Diamond and Functional Materials I
FM 7.5: Talk
Tuesday, March 10, 2026, 10:45–11:00, BEY/0E40
Application of Raman and Photoluminescence Spectroscopy to MgO-C Refractories — •Julia Richter1, Felix Drechsler1, Till Stadtmüller2, Cameliu Himcinschi1, Christos Aneziris2, and Jens Kortus1 — 1Technische Universität Bergakademie Freiberg - Institut für Theoretische Physik, Leipziger Straße 23, 09599 Freiberg, Germany — 2Technische Universität Bergakademie Freiberg - Institut für Keramik, Feuerfest und Verbundwerkstoffe, Agricolastraße 17, 09599 Freiberg, Germany
By applying Raman and photoluminescence (PL) spectroscopy in the visible and near-infrared range to MgO, magnesia-carbon (MgO-C) refractory bricks - partially produced from recycled magnesia - are examined in hardened and coked state, and compared with nominally pure MgO powder as a reference. Two sharp, high-intensity PL signals (699 nm and 871 nm), each accompanied by symmetrical sidebands, are investigated by varying the excitation wavelength (532, 633, and 785 nm). The 699 nm PL feature observed for both brick and reference arises from Cr3+ impurities within the MgO lattices, whereas the 871 nm signal, associated with V2+, appears only in the brick-derived MgO. To elucidate the origin of the symmetrical sidebands, temperature-dependent spectroscopic measurements from 100 to 295 K are performed, monitoring the intensity ratio of the higher-energy (anti-Stokes) and lower-energy (Stokes) sidebands. The results confirm phonon participation in both the MgO:Cr3+ and MgO:V2+ emission processes. Together, these findings connect fundamental defect physics with practical considerations in refractory material science.
Keywords: Raman Spectroscopy; Photoluminescence; MgO defects; MgO-C Refractory; Refractory Recycling