The sodium loss and transport through the walls of the ceramic discharge tube of high pressure sodium lamps

H. Lovas, V. K. Josepovits, Z. Tóth, J. Madarász

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

In this work we present the investigations on the blackening of the outer jacket of the High Pressure Sodium (HPS) lamps. For this purpose ceramic arc tubes and their glass outer jackets taken from lamps burned for different times (0h-10000h) were examined by X-ray Photoelectron Spectroscopy (XPS) and Secondary Ion Mass Spectroscopy (SIMS) in order to determine the composition of the deposit on the internal wall of glass outer jacket. In the case of the several thousand hours burned lamps the outer bulb was found to be covered by aluminium, which comes to a black deposit on the glass surface. XPS identified Al on the glass surface can be found in two different chemical state (elemental Al, Al2O3). The assumed evaporation of aluminium-oxide ceramic tube might be described by a dissociative mechanism of the alumina evaporation. This papers described the possible mechanism of the alumina evaporation. Na was also found in the black deposit, whose cause of this in the case of the several thousand hours burned lamps is probably related to the sodium transport through the walls of the arc tube.

Original languageEnglish
Title of host publicationFast Software Encryption - 14th International Workshop, FSE 2007, Revised Selected Papers
PublisherTrans Tech Publications Ltd
Pages1363-1368
Number of pages6
EditionPART 2
ISBN (Print)9780878494026
DOIs
Publication statusPublished - Jan 1 2006
Event3rd International Materials Symposium and 12th Portuguese Materials Society Meeting 2005 - Aveiro, Portugal
Duration: Mar 20 2005Mar 23 2005

Publication series

NameMaterials Science Forum
NumberPART 2
Volume514-516
ISSN (Print)0255-5476

Other

Other3rd International Materials Symposium and 12th Portuguese Materials Society Meeting 2005
CountryPortugal
CityAveiro
Period3/20/053/23/05

Keywords

  • Discharge tube
  • HPS lamp
  • Polycrystalline alumina
  • SIMS
  • Sodium loss
  • XPS

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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  • Cite this

    Lovas, H., Josepovits, V. K., Tóth, Z., & Madarász, J. (2006). The sodium loss and transport through the walls of the ceramic discharge tube of high pressure sodium lamps. In Fast Software Encryption - 14th International Workshop, FSE 2007, Revised Selected Papers (PART 2 ed., pp. 1363-1368). (Materials Science Forum; Vol. 514-516, No. PART 2). Trans Tech Publications Ltd. https://doi.org/10.4028/www.scientific.net/msf.514-516.1363