title: Effect of gamma irradiation on X-ray absorption and photoelectron spectroscopy of Nd-doped phosphate glass.
abstract: X-ray absorption near-edge structure (XANES) and X-ray photoelectron spectroscopy (XPS) of Nd-doped phosphate glasses have been studied before and after gamma irradiation. The intensity and the location of the white line peak of the L3-edge XANES of Nd are found to be dependent on the ratio O/Nd in the glass matrix. Gamma irradiation changes the elemental concentration of atoms in the glass matrix, which affects the peak intensity of the white line due to changes in the covalence of the chemical bonds with Nd atoms in the glass (structural changes). Sharpening of the Nd 3d5/2peak profile in XPS spectra indicates a deficiency of oxygen in the glasses after gamma irradiation, which is supported by energy-dispersive X-ray spectroscopy measurements. The ratio of non-bridging oxygen to total oxygen in the glass after gamma radiation has been found to be correlated to the concentration of defects in the glass samples, which are responsible for its radiation resistance as well as for its coloration.
authors: Indus Synchrotron Utilization Division, Raja Ramanna Centre for Advanced Technology, Indore 452013, India.
authors: V N
authors: VN
authors: Rai
authors: Atomic & Molecular Physics Division, Bhabha Atomic Research Center, Trombay, Mumbai-400085, India.
authors: Parasmani
authors: P
authors: Rajput
authors: Atomic & Molecular Physics Division, Bhabha Atomic Research Center, Trombay, Mumbai-400085, India.
authors: S N
authors: SN
authors: Jha
authors: Atomic & Molecular Physics Division, Bhabha Atomic Research Center, Trombay, Mumbai-400085, India.
authors: D
authors: D
authors: Bhattacharyya
authors: Atomic & Molecular Physics Division, Bhabha Atomic Research Center, Trombay, Mumbai-400085, India.
authors: B N
authors: BN
authors: Raja Shekhar
authors: UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452001, India.
authors: U P
authors: UP
authors: Deshpande
authors: UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452001, India.
authors: T
authors: T
authors: Shripathi
keywords: XAFS; defect; glasses; photoelectron spectroscopy; radiation damage