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High-pressure phase transitions in tetrakis(trimethylsilyl)silane SiSi(CH3)34

Title data

Wunschel, Markus ; Dinnebier, Robert E. ; Carlson, Stefan ; van Smaalen, Sander:
High-pressure phase transitions in tetrakis(trimethylsilyl)silane SiSi(CH3)34.
In: High Pressure Research. Vol. 23 (2003) Issue 4 . - pp. 425-437.
ISSN 1477-2299
DOI: https://doi.org/10.1080/0895795031000114377

Official URL: Volltext

Abstract in another language

The compound tetrakis(trimethylsilyl)silane SiSi(CH 3)34 (TSi) has been studied at room temperature for pressures up to 21.5(1) GPa, using X-ray powder diffraction with synchrotron radiation. Three different phases are reported in the investigated pressure range. The c.c.p.-type structure is stable up to a pressure of 0.19(1) GPa ( , a = 13.5211(1) Å, V = 2471.95(1) Å3, Z = 4 at 0.02(1) GPa). It shows a severe orientational disorder of the molecules. At pressures 0.19(1)–0.71(1) GPa a monoclinic phase (HP1) is found with space group P 21/n and Z = 8 (a = 17.746(1) Å, b = 16.098(1) Å, c = 16.871(1) Å, γ = 111.437(5)ˆ and V = 4486.3(8) Å3 at 0.24(1) GPa). Another monoclinic phase (HP2) exists at pressures 0.52(1)–8.67(5) GPa. This phase has a smaller unit cell than the HP1 phase with Z = 2 (a = 8.3778(8) Å, b = 9.1050(7) Å, c = 13.3024(8) Å, γ = 111.63(1)ˆ and V = 943.22(6) Å3 at 1.73(2) GPa). The pressure dependencies of the unit-cell volumes are successfully described by Murnaghan or Vinet-type equations of state. The structures at different pressures and temperatures of TSi and related compounds are described as distorted superstructures of the c.c.p. arrangement. The occurrence of different superstructures is rationalized as the result of an optimized packing of ordered molecules of various shapes.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences > Chair Crystallography
Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences > Chair Crystallography > Chair Crystallography - Univ.-Prof. Dr. Sander van Smaalen
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 18 Mar 2016 07:57
Last Modified: 18 Mar 2016 07:57
URI: https://eref.uni-bayreuth.de/id/eprint/31905