Investigations on optical, structural and thermal properties of phosphate glasses containing terbium ions

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Abstract

Aluminophosphate glasses belonging to the Li2O-BaO-Al2O3-La2O3-P2O5 system doped with Tb3+ were prepared and investigated. Methodsas Induced Coupled Plasma-Mass Spectrometry (ICP-MS), Induced CoupledPlasma-Atomic Emission Spectroscopy (ICP-AES) and X-ray diffraction(XRD) have been used to establish the elemental composition of these vitreousmaterials. The influence of the Tb3+ ions on the optical properties of thephosphate glasses has been investigated in relation with the structuralcharacteristics of the vitreous matrix. The optical behavior has been studied byultra-violet-visible (UV-Vis) spectroscopy, revealing electronic transitionsspecific for terbium ions. Fluorescence spectroscopy measurements have beenperformed by excitation in the UV and visible domains (377 nm and 488 nm)which resulted in the most significant fluorescence peaks in the Vis domain(540 and 547 nm). Structural information via vibration modes were providedby Fourier Transform Infrared (FTIR) absorption spectra in the 400-4000 cm-1range. Absorption peaks specific for the vitreous phosphate matrix were put inevidence as P-O-P symmetrical and asymmetrical stretching vibration modes,P-O-P bend, PO2- symmetrical and asymmetrical stretching vibration modes,P=O stretching vibration mode as well as P-O-H water absorbance. Ramanspectra acquired in the 100-4000 cm-1 range by 488, 514 and 633 nm laserexcitation sources disclosed peaks also specific for the phosphate matrix,proving the role of phosphorous oxide as a vitreous network former.Differential Scanning Calorimetry and Thermogravimetric Analysis (DSCTGA)provided information regarding the phase transformations that tookplace during the heating process and the associated thermal effects.
Original languageUnknown
Title of host publicationIOP Conf. Series: Materials Science and Engineering
Pages1-8
Volume47
DOIs
Publication statusPublished - 1 Jan 2013
Event2nd International Conference on Competitive Materials and Technological Processes -
Duration: 1 Jan 2013 → …

Conference

Conference2nd International Conference on Competitive Materials and Technological Processes
Period1/01/13 → …

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