Spectroscopic analysis of potassium zinc phosphate glass matrix doped CuO for optical filter applications
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RESEARCH ARTICLE
Spectroscopic analysis of potassium zinc phosphate glass matrix doped CuO for optical filter applications D. A. Rayan1 • Y. H. Elbashar2,3
Received: 8 June 2020 / Accepted: 16 September 2020 Ó The Optical Society of India 2020
Abstract Phosphate glasses of chemical composition xCuO–(24-x)K2O–48P2O5–28ZnO; where x = 0, 2, 4, 6, 8 and 10 molar ratios, have been prepared using the melt quenching technique. Density, molar volume, oxygen packing density and oxygen molar volume have been calculated. Water durability is determined from the measurement of the dissolution rate in deionized water. The dissolution rate is found to decrease with increasing CuO, indicating the improvement of water durability. FTIR spectroscopy of all glass samples has been investigated in the wavenumber range 400–2000 cm-1. Analysis of FTIR spectra confirms the structural role of CuO as a network modifier. Optical spectroscopy of these phosphate glasses has been measured over the wavelength range of 190–2000 nm. By calculating the optical bandgap, it is found that Eg decrease with increasing CuO indicating the creation of non-bridging oxygens. Keywords Bandpass filters Potassium phosphate glasses Copper phosphate glasses Optical properties Laser safety
& Y. H. Elbashar [email protected] 1
Central Metallurgical Research and Development Institute (CMRDI), P.O. Box 87, Helwan, Cairo 11421, Egypt
2
Department of Basic Science, EL-Gazeera High Institute for Engineering and Technology, Cairo, Egypt
3
Egypt Nanotechnology Center (EGNC), Cairo University, Giza, Egypt
Introduction Phosphate glasses matrix are distinguished for optical materials as a high expansion coefficient glass, low transition temperature and high UV transmission [1]. Copper phosphate glasses are candidates in many applications such as absorption filters, sealing materials and dielectric materials [2–4]. The high percentage of CuO on phosphate glasses may facilitate crystallization of formed melt [5]. The optical absorption of phosphate glasses containing copper oxide is characterized by a broad absorption band in the visible/near IR region [2, 6]. The poor chemical durability of phosphate glasses can be improved by addition of one or more of multivalent oxides such as copper oxide, zinc oxide, lead oxide and iron oxide and so on [6]. Transition metal ions can create a significant change in optical, electric, magnetic properties of glasses due to their high sensitivity to interact with surrounding cations and their ability to exist in more than one valence state [7]. X-ray photoelectron spectroscopy showed that most of copper ions are monovalent in 30CuO–70P2O5 glass irradiated by laser, and the ratio of non-bridging oxygen to total oxygen increases with increasing laser power irradiation [8]. Zinc oxide in a glass network can act as either a glass former in the form of ZnO4 structural units or a network modifier where zinc ions are octahedrally coordinated, depending on the ZnO content [9]. Potassium oxide is one of the best modifiers in phosph
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