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@PHDTHESIS{Ohnesorge:44059,
      author       = {Ohnesorge, Mischa},
      title        = {{U}ntersuchungen zur {H}ochtemperaturchemie
                      quecksilberfreier {M}etallhalogenid-{E}ntladungslampen mit
                      keramischem {B}renner},
      volume       = {4171},
      issn         = {0944-2952},
      school       = {Techn. Hochsch. Aachen},
      type         = {Dr. (FH)},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {PreJuSER-44059, Juel-4171},
      series       = {Berichte des Forschungszentrums Jülich},
      pages        = {201 S.},
      year         = {2005},
      note         = {Record converted from VDB: 12.11.2012; Aachen, Techn.
                      Hochsch., Diss., 2005},
      abstract     = {The development of mercury–free metal halide lamps
                      requires a modification of the burner vessel design and of
                      the metal halide filling, compared to mercury–containing
                      lamp types. Metal halides as NaI, TlI, DyI$_{3}$ are added
                      to discharge lamps in order to achieve a line–rich
                      emission spectrum, resembling the sunlight. While
                      evaporating, several chemical reactions occur among the
                      inserted metal halides. Thus infecting the properties of
                      light generation in a metal halide lamp. Further a corrosion
                      attack on the burner vessel is observed due to chemical
                      reactions of metal halides with the wall material
                      Polycrystalline Alumina (PCA). In order to enhance the
                      properties of light generation, it is aimed to describe the
                      lamps in a thermodynamic model. Therefore statements on the
                      light colour and the efficiency can be made. A complete
                      thermodynamic data set of both gas and liquid phase
                      reactions is required. Within the scope of the work in hand
                      thermodynamic data for the formation of homo and hetero
                      complexes as well as for chemical activities and excess
                      enthalpies in metal halide systems were determined. A
                      further reactive component is added to the chemical system
                      of a metal halide lamp due to the mercury replacement
                      Zn/ZnI$_{2}$. Interactions between Zn/ZnI$_{2}$ and metal
                      halides cause the formation of new gas phase species, which
                      were identified. Their influence on the properties of light
                      generation and on corrosion was investigated. Therefore
                      annealing experiments were conducted to elucidate the
                      high–temperature corrosion of PCA. The observed corrosion
                      phenomena were interpreted with respect to the principles of
                      chemical transport. Model calculations using the beforehand
                      determined data were accomplished to support the
                      interpretation of the results, the annealing experiments
                      obtained.},
      cin          = {IWV-2},
      cid          = {I:(DE-Juel1)VDB2},
      pnm          = {Werkstoffsysteme für Kraftwerke},
      pid          = {G:(DE-Juel1)FUEK248},
      typ          = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
      url          = {https://juser.fz-juelich.de/record/44059},
}