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 language | English |
|---|---|
| Pages (from-to) | 701-705 |
| Number of pages | 5 |
| Journal | Applied Organometallic Chemistry |
| Volume | 17 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - Sep 1 2003 |
| Externally published | Yes |
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Keywords
- Pt-Al phase
- Synthesis
- X-ray
ASJC Scopus subject areas
- Chemistry (miscellaneous)
- Inorganic Chemistry
Cite this
Synthesis and characterization of a new modification of PtAl. / Weidenthaler, Claudia; Brijoux, Werner; Ould-Ely, Teyeb; Spliethoff, Bernd; Bönnemann, Helmut.
In: Applied Organometallic Chemistry, Vol. 17, No. 9, 01.09.2003, p. 701-705.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Synthesis and characterization of a new modification of PtAl
AU - Weidenthaler, Claudia
AU - Brijoux, Werner
AU - Ould-Ely, Teyeb
AU - Spliethoff, Bernd
AU - Bönnemann, Helmut
PY - 2003/9/1
Y1 - 2003/9/1
N2 - 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.
AB - 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.
KW - Pt-Al phase
KW - Synthesis
KW - X-ray
UR - http://www.scopus.com/inward/record.url?scp=0042819711&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0042819711&partnerID=8YFLogxK
U2 - 10.1002/aoc.487
DO - 10.1002/aoc.487
M3 - Article
VL - 17
SP - 701
EP - 705
JO - Applied Organometallic Chemistry
JF - Applied Organometallic Chemistry
SN - 0268-2605
IS - 9
ER -