title: Effects of copper on the preparation and characterization of Na-Ca-P borate glasses.
abstract: Glasses in the system Na2O-CaO-B2O3-P2O5: CuO have been prepared by melt quenching at 1200°C and rapidly cooling at room temperature. The structural, optical and thermal properties have been investigated using X-ray diffraction (XRD), ultraviolet-visible (UV-VIS) spectroscopy, thermogravimetric-differential thermal analysis (TG-DTA), Fourier transform infrared (FTIR) spectroscopy, high resolution scanning electron microscopy (HRSEM) with energy dispersive X-ray (EDX) spectroscopy and high resolution transmission electron microscope (HRTEM) with energy dispersive X-ray (EDAX). The amorphous and crystalline nature of these samples was verified by XRD. Glass transition, crystallization and thermal stability were determined by TG-DTA investigations. Direct optical energy band gaps before and after doping with different percents of copper oxide were evaluated from 4.81eV to 2.99eV indicated the role of copper in the glassy matrix by UV spectra. FTIR spectrum reveals characteristic absorption bands due to various groups of triangular and tetrahedral borate network. Due to the amorphous nature, the particles like agglomerates on the glass surface were investigated by the HRSEM analysis. The crystalline nature of the samples in XRD is confirmed by SAED pattern using HRTEM.
authors.affiliation: Department of Physics, Manonmaniam Sundaranar University, Tirunelveli, Tamil Nadu, India. Electronic address: drsshailajha_msu@yahoo.com.
authors.forename: S
authors.initials: S
authors.lastname: Shailajha
authors.affiliation: Department of Physics, Manonmaniam Sundaranar University, Tirunelveli, Tamil Nadu, India.
authors.forename: K
authors.initials: K
authors.lastname: Geetha
authors.affiliation: Department of Physics, Annamalai University, Chidambaram, Tamil Nadu, India.
authors.forename: P
authors.initials: P
authors.lastname: Vasantharani
authors.affiliation: Department of Physics, Manonmaniam Sundaranar University, Tirunelveli, Tamil Nadu, India.
authors.forename: S P
authors.initials: SP
authors.lastname: Sheik Abdul Kadhar
mesh_terms: D001881:Borates / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D003460:Crystallization; D004055:Differential Thermal Analysis; D005898:Glass / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D055620:Optical Phenomena; D013052:Spectrometry, X-Ray Emission; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D013818:Thermogravimetry; D044366:Transition Temperature; D014961:X-Ray Diffraction
chemical_list: D001881:Borates; D003300:Copper
keywords: Copper borate glass; HRSEM; HRTEM; Optical band gap; TG-DTA; XRD