title: XRD and FTIR studies the effect of heat treatment and doping the transition metal oxide on LiNbO3 and LiNb3O8 nano-crystallite phases in lithium borate glass system.
abstract: Glasses of various compositions in the system 90 Li2B4O7-10 Nb2O5 mixed with T.M ions (where T.M is the transition metal) were prepared by quenching technique. Heat-treatment of the parent glasses was performed at 540, 570 and 620 °C, for 5 and 16 h. The glass structure evolution during the controlled crystallization was examined by XRD and FT-IR spectroscopy analysis. The crystalline phases present in the glass ceramics were identified via X-ray diffraction as a function of heat treatment. The FT-IR data propose for these glasses and heat-treated glass network structures mainly built by: di-, tri-, tetra-, penta-and ortho-borate groups. It was found that the quantitative evolution of these various borate species in the glass structures is influenced by the transition metal. A detailed discussion relating to the N4 evolution with the T.M content was made.
authors.affiliation: Physics Department, Faculty of Science, Al-Azhar University, Nasr City, Cairo, Egypt. isnham@alo.com
authors.forename: Ismail
authors.initials: I
authors.lastname: Kashif
authors.forename: Ashia A
authors.initials: AA
authors.lastname: Soliman
authors.forename: Elham M
authors.initials: EM
authors.lastname: Sakr
authors.forename: Asmaa
authors.initials: A
authors.lastname: Ratep
mesh_terms: D003460:Crystallization; D005898:Glass / Q000737:chemistry*; D006358:Hot Temperature; D053758:Nanoparticles / Q000737:chemistry*; D009556:Niobium / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013997:Time Factors; D028561:Transition Elements / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D010087:Oxides; D028561:Transition Elements; D009556:Niobium; C091692:lithium niobate; C073337:niobium pentoxide
keywords: FTIR; Heat Treatment; LiNb(3)O(8) and LiNbO(3) phases; Oxide glass; XRD