"

Cookies ussage consent

Our site saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing our site without changing the browser settings you grant us permission to store that information on your device.

I agree, do not show this message again.

Atomic environment changes induced by rare earths addition to heavy metal glasses

V. SIMON1,* , O. PONTA1, S. SIMON1, M. NEUMANN2

Affiliation

  1. Babes-Bolyai University, Faculty of Physics & Institute for InterdisciplinarExperimental Research, 400084 Cluj-Napoca, Romania
  2. University of Osnabrück, Physics Department, 49069 Osnabrück, Germany

Abstract

The study aims to evidence the local order changes in Bi2O3-GeO2 heavy metal glasses by addition of gadolinium oxide. The elemental analysis carried out by X-ray photoemission spectroscopy shows that in the first surface layers the oxygen and germanium contents are higher than the calculated values for bulk samples, while the content of gadolinium and bismuth atoms is lower than the expected values for bulk samples. Non-equivalent sites of bismuth atoms are evidenced in the glasses with low Gd2O3 content (x ≤ 3 mol %). The gadolinium addition to Bi2O3-GeO2 glass matrix determines the diminishing of bridging oxygens number and implicitly a depolymerization of the glass structure. On the other hand, the decrease of full-width at half-maximum of O 1s photoelectron peaks denotes the diminishing of the structural disorder in samples. According to the values of O 1s photoelectrons binding energy, the investigated samples are a mixture of ionic and covalent oxide compounds..

Keywords

Heavy metal glass, Rare-earth, Bi2O3-GeO2 glass, Gd2O3.

Submitted at: Feb. 25, 2008
Accepted at: Aug. 28, 2008

Citation

V. SIMON, O. PONTA, S. SIMON, M. NEUMANN, Atomic environment changes induced by rare earths addition to heavy metal glasses, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 9, pp. 2325-2327 (2008)