In situ Raman and Time-Resolved Luminescence Investigation of the Local Structure of ZrO2 in the Amorphous to Crystalline Phase TransitionClick to copy article linkArticle link copied!
- Carmen Tiseanu
- Vasile I. Parvulescu
- Bogdan Cojocaru
- Kelly Pemartin
- Margarita Sanchez-Dominguez
- Magali Boutonnet
Abstract

The local structure of europium doped and impregnated ZrO2 in the amorphous state and during crystallization is investigated by in situ X-ray diffraction and in situ Raman, high-resolution transmission electron microscopy (HRTEM) and time-resolved photoluminescence spectroscopy. From Raman spectra excited at three different wavelengths (λex= 488, 514, and 633 nm), both phonon modes of ZrO2 and photoluminescence (PL) corresponding to europium electronic transitions were investigated. In the as-synthetized state, samples were X-ray and Raman amorphous with few tetragonal (also monoclinic) crystallites being observed under HRTEM microscopy. In situ XRD patterns show that all samples crystallize in the tetragonal phase around 450 °C. The time-resolved PL spectra of europium doped and impregnated ZrO2 show spectral dynamics with time delay after lamp/laser pulse which is assigned to the coexistence of the different amorphous and crystalline components or unreacted europium precursor. From in situ Raman spectra, crystallization was detected at 300–350 °C, monitoring for the characteristic tetragonal-like 5D0–7F2 emission of europium at 606 nm. The ratio of tetragonal to amorphous emission increased abruptly from ca. 2–4% at 300–400 °C to almost 25% at 400–450 °C, whereas at 500 °C the emission is mostly tetragonal. A similar trend was found with the ex situ calcined samples, but relative strong tetragonal emission was observed at lower temperature in the range of 350 to 400 °C.
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