Ti K-edge XANES study of the local environment of titanium in bioresorbable TiO2–CaO–Na2O–P2O5 glasses

Pickup, David M.; Abou Neel, Ensanya A.; Moss, Robert; Wetherall, Kate M.; Guerry, Paul; Smith, Mark E.; Knowles, Jonathan C.; Newport, Robert J.
April 2008
Journal of Materials Science: Materials in Medicine;Apr2008, Vol. 19 Issue 4, p1681
Academic Journal
Ti K-edge XANES (X-ray absorption near edge structure) spectroscopy has been used to study the local coordination of titanium in biocompatible and bioresorbable TiO2–CaO–Na2O–P2O5 glasses. Both conventional melt-quenched glasses of composition (TiO2) x (CaO)0.30(Na2O)(0.20− x)(P2O5)0.50, where x = 0.01, 0.03 and 0.05, and sol–gel derived (TiO2)0.25(CaO)0.25(P2O5)0.50 glass have been studied. The results show that in all the materials studied, titanium is surrounded by an octahedron of oxygen atoms. Further analysis reveals that the TiO6 site in the amorphous samples is not heavily distorted relative to that in rutile, anatase or CaSiTiO5. The spectra from the (TiO2)0.25(CaO)0.25(P2O5)0.50 sol–gel samples reveal greater distortion in the TiO6 site in the dried gel compared to the heat-treated sol–gel glass. The XANES spectra from melt-quenched glass samples soaked in distilled water for various times do not shown any evidence of degradation of the titanium site over periods of up to 14 days.


Related Articles

  • Oxygen vacancy effect on room-temperature ferromagnetism of rutile Co:TiO2 thin films. Wensheng Yan; Zhihu Sun; Zhiyun Pan; Qinghua Liu; Tao Yao; Ziyu Wu; Cheng Song; Fei Zeng; Yaning Xie; Tiandou Hu; Shiqiang Wei // Applied Physics Letters;1/26/2009, Vol. 94 Issue 4, pN.PAG 

    The x-ray absorption near edge structure spectroscopy and first-principles calculations were combined to study the local and electronic structures of rutile Co:TiO2 thin film with room-temperature ferromagnetism. It was revealed that the CoTi2+ substituting the Ti site forms CoTi2+-VO complex...

  • Etching damage and its recovery by soft X-ray irradiation observed in soft X-ray absorption spectra of TiO2 thin film. Niibe, Masahito; Sano, Keiji; Kotaka, Takuya; Kawakami, Retsuo; Tominaga, Kikuo; Nakano, Yoshitaka // Journal of Applied Physics;Mar2013, Vol. 113 Issue 12, p126101 

    Damage characteristics of TiO2 thin films etched by N2 plasma were analyzed using soft X-ray absorption spectroscopy. Changes in the spectra at the Ti-L2,3 near-edge X-ray absorption fine structure (NEXAFS) resulting from etching damage were observed more in the bulk region rather than in the...

  • The chemical forms of mercury in human hair: a study using X-ray absorption spectroscopy. George, Graham; Singh, Satya; Myers, Gary; Watson, Gene; Pickering, Ingrid // Journal of Biological Inorganic Chemistry;Jun2010, Vol. 15 Issue 5, p709 

    Human hair is frequently used as a bioindicator of mercury exposure. We have used X-ray absorption spectroscopy to examine the chemical forms of mercury in human hair samples taken from individuals with high fish consumption and concomitant exposure to methylmercury. The mercury is found to be...

  • Characterization of Binary Ag-Cu Ion Mixtures in Zeolites: Their Reduction Products and Stability to Air Oxidation. Fiddy, Steven; Petranovskii, Vitalii; Ogden, Steve; Iznaga, Inocente Rodríguez // AIP Conference Proceedings;2007, Vol. 882 Issue 1, p631 

    A series of Ag+-Cu2+ binary mixtures with different Ag/Cu ratios were supported on mordenite with different Si/Al ratios and were subsequently reduced under hydrogen in the temperature range 323K – 473K. Ag and Cu K-edge X-ray Absorption Spectroscopy (XAS) was conducted on these systems...

  • Selective Study of Atoms in Rough Gold Surfaces by Means of Yoneda-XAFS. Keil, P.; Lützenkirchen-Hecht, D.; Frahm, R. // AIP Conference Proceedings;2007, Vol. 882 Issue 1, p475 

    A new method of grazing incidence X-ray absorption spectroscopy using an off-specular reflection geometry referred to as Yoneda-XAFS is presented. Using an asymmetric setup, with the detector centered at the Yoneda peak, this technique is sensitive to lateral heterogeneities which typically...

  • Investigation of Aluminate and Al2O3 Crystals and Melts at High Temperature Using XANES Spectroscopy. Neuville, Daniel R.; Cormier, Laurent; Roux, Jacques; Henderson, Grant S.; de Ligny, Dominique; Flank, Anne-Marie; Lagarde, Pierre // AIP Conference Proceedings;2007, Vol. 882 Issue 1, p419 

    Using X-ray absorption at the Al K-edge at high temperature, structural information was determined on Al2O3, CaAl2O4 (CA), Ca3Al2O6 (C3A) and CaAl2Si2O8 (anorthite) in the crystalline and liquid states (2380 K). Important changes are observed for Al2O3 where all oscillation in the XANES spectra...

  • Identification of bulk and surface sulfur impurities in TiO2 by synchrotron x-ray absorption near edge structure. Smith, M. F.; Setwong, Kongthip; Tongpool, Rungnapa; Onkaw, Darin; Na-phattalung, Sutassana; Limpijumnong, Sukit; Rujirawat, Saroj // Applied Physics Letters;10/1/2007, Vol. 91 Issue 14, p142107 

    Synchrotron x-ray absorption near edge structure (XANES) measurements of Ti and S K edges, combined with first principles simulations, are used to characterize S-doped TiO2 prepared by oxidative annealing of TiS2 at various temperatures. Ti-edge XANES and x-ray powder diffraction data indicate...

  • Determination of Co spin state in rutile Co:TiO2. Yan, Wensheng; Sun, Zhihu; Yao, Tao; Pan, Zhiyun; Li, Zhongrui; Liu, Qinghua; Wei, Shiqiang // Journal of Applied Physics;Dec2009, Vol. 106 Issue 12, p123918-1 

    X-ray absorption near-edge structure (XANES) and first-principles calculations are employed to determine the Co spin state in the Co-doped TiO2 thin films. Based on the experiments and the theoretical calculations, we find that the transition of Co 1s electron to the unoccupied Co 3d eg states...

  • Transesterification of Dimethylcarbonate and Phenol Over Silica Supported TiO2 and Ti-MCM 41 Catalysts: Structure Insensitivity. Joshi, Upendra A.; Sun Hee Choi; Jum Suk Jang; Jae Sung Lee // Catalysis Letters;Jul2008, Vol. 123 Issue 1/2, p115 

    Silica-supported titanium dioxide (TiO2/SiO2) and Ti-MCM 41 catalysts have been used for transesterification of dimethylcarbonate (DMC) and phenol to methylphenylcarbonate (MPC). The structure and the chemical state of titanium species in TiO2/SiO2 and Ti-MCM 41 have been investigated by means...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics