Data di Pubblicazione:
2007
Citazione:
Effective hydrostatic limits of pressure media for high-pressure crystallographic studies / R.J. Angel, M. Bujak, J. Zhao, G.D. Gatta, S.D. Jacobsen. - In: JOURNAL OF APPLIED CRYSTALLOGRAPHY. - ISSN 0021-8898. - 40:1(2007), pp. cg5051.26-cg5051.32. [10.1107/S0021889806045523]
Abstract:
The behavior of a number of commonly used pressure media, including
nitrogen, argon, 2-propanol, a 4:1 methanol–ethanol mixture, glycerol and
various grades of silicone oil, has been examined by measuring the X-ray
diffraction maxima from quartz single crystals loaded in a diamond-anvil cell
with each of these pressure media in turn. In all cases, the onset of nonhydrostatic
stresses within the medium is detectable as the broadening of the
rocking curves of X-ray diffraction peaks from the single crystals. The onset of
broadening of the rocking curves of quartz is detected at 9.8 GPa in a 4:1
mixture of methanol and ethanol and at 4.2 GPa in 2-propanol, essentially at
the same pressures as the previously reported hydrostatic limits determined by
other techniques. Gigahertz ultrasonic interferometry was also used to detect
the onset of the glass transition in 4:1 methanol–ethanol and 16:3:1 methanol–
ethanol–water, which were observed to support shear waves above 9.2 and
10.5 GPa, respectively, at 0.8–1.2 GHz. By contrast, peak broadening is first
detected at 3 GPa in nitrogen, 1.9 GPa in argon, 1.4 GPa in glycerol
and 0.9 GPa in various grades of silicone oil. These pressures, which are
significantly lower than hydrostatic limits quoted in the literature, should be
considered as the practical maximum limits to the hydrostatic behavior of these
pressure media at room temperature.
Tipologia IRIS:
01 - Articolo su periodico
Elenco autori:
R.J. Angel, M. Bujak, J. Zhao, G.D. Gatta, S.D. Jacobsen
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