The sodium transport in polycrystalline alumina

H. Lovas, V. K. Josepovits, Z. Tóth, M. Tóth

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

3 Citations (Scopus)

Abstract

In this work we present the investigations on the determination of the mechanism of sodium loss in High Pressure Sodium (HPS) lamps. The transport through the ceramic arc tube consists of several steps (solution in the ceramics, diffusion through the ceramics, leaving the bulk phase, evaporation from the surface). Among the listed processes the mechanism of the diffusion was investigated by model-experiments. A ceramic arc tube was applied as a reactor chamber, in which polycrystalline ceramic plates were heated at 600-1100°C in controlled Na and Xe atmosphere. The sodium diffusion profiles developed by the heat-treatment were measured by XPS and SIMS and from the measurements we tried to draw a conclusion about the mechanism of sodium diffusion through the ceramic discharge tube. The ceramic discharge tube were measured by X- ray diffraction, too. We found traces of some Na-O-Al compound.

Original languageEnglish
Title of host publicationMaterials Science, Testing and Informatics III - Proceedings of the 5th Hungarian Conference on Materials Science, Testing and Informatics
Pages405-412
Number of pages8
Publication statusPublished - Dec 1 2007
Event5th Hungarian Conference on Materials Science, Testing and lnformatics - Balatonfured, Hungary
Duration: Oct 9 2005Oct 11 2005

Publication series

NameMaterials Science Forum
Volume537-538
ISSN (Print)0255-5476

Other

Other5th Hungarian Conference on Materials Science, Testing and lnformatics
CountryHungary
CityBalatonfured
Period10/9/0510/11/05

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Keywords

  • Diffusion
  • 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

Cite this

Lovas, H., Josepovits, V. K., Tóth, Z., & Tóth, M. (2007). The sodium transport in polycrystalline alumina. In Materials Science, Testing and Informatics III - Proceedings of the 5th Hungarian Conference on Materials Science, Testing and Informatics (pp. 405-412). (Materials Science Forum; Vol. 537-538).