Synthesis and characterization of a new modification of PtAl

Claudia Weidenthaler, Werner Brijoux, Teyeb Ould-Ely, Bernd Spliethoff, Helmut Bönnemann

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Abstract

A new PtAl phase, which is stable at room temperature under oxidizing conditions, has been synthesized at 200 °C and 5 MPa. X-ray studies reveal it to be different from the known polymorphs of PtAl, which crystallize in the FeSi and CsCl structure types. The crystal structure of the new PtAl modification is found to be isotypical with the low-temperature modification of PdAl. In situ high-temperature X-ray diffraction experiments in air were performed to study the thermal behavior of the new PtAl alloy. In the temperature range between 400 and 700 °C, Pt5Al3 forms as an intermediate phase. At higher temperature the alloy decomposes, resulting in the formation of platinum and Al2O3. The thermodynamic instability at high temperatures explains why this new modification has not been observed using contemporary metallurgic processes.

Original languageEnglish
Pages (from-to)701-705
Number of pages5
JournalApplied Organometallic Chemistry
Volume17
Issue number9
DOIs
Publication statusPublished - Sep 1 2003

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Keywords

  • Pt-Al phase
  • Synthesis
  • X-ray

ASJC Scopus subject areas

  • Chemistry(all)
  • Inorganic Chemistry

Cite this

Weidenthaler, C., Brijoux, W., Ould-Ely, T., Spliethoff, B., & Bönnemann, H. (2003). Synthesis and characterization of a new modification of PtAl. Applied Organometallic Chemistry, 17(9), 701-705. https://doi.org/10.1002/aoc.487