Synthesis and Crystal Structures of Two New Platinum Phosphosilicides, PtSi 3P 2and PtSi 2P 2; Electrical Resistivity of PtSi 3P 2
Abstract
Two phosphosilicides PtSi3P2and PtSi2P2have been prepared in a tin flux and their crystal structures determined from single crystal X-ray diffraction data. PtSi3P2crystallizes in the triclinic space groupP1,a=4.840(1) Å,b=5.482(1) Å,c=8.052(1) Å,α=91.57(1)°,β=93.52(1)°,γ=108.14(1)°,Z=2. PtSi2P2crystallizes in the monoclinic space groupP21,a=6.025(1) Å,b=9.468(1) Å,c=11.913(1) Å, andβ=102.91(1)°,Z=8. FinalRfactors areR=0.049 for the former andR=0.040 for the latter. Pt atoms are octahedrally coordinated by P and Si atoms. P and Si atoms are tetrahedrally surrounded by Pt, Si, and P atoms. In PtSi3P2Pt octahedra, connected via edge-sharing, form Pt2(Si/P)10pairs separated from each other, while PtSi2P2exhibits clusters of four edge-sharing octahedra with bonding between clusters via common corners. The behavior of the electrical resistivity of PtSi3P2is metallic but with very high values.
- Publication:
-
Journal of Solid State Chemistry France
- Pub Date:
- November 1997
- DOI:
- 10.1006/jssc.1997.7512
- Bibcode:
- 1997JSSCh.133..473P