Quick Search:    advanced search

GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help

This Article Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in ISI Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (7) Citing Articles via Google Scholar Google Scholar Articles by MUELLER, H. J. Articles by LATHE, C. Search for Related Content GeoRef GeoRef Citation

A standard-free pressure calibration using simultaneous XRD and elastic property measurements in a multi-anvil device

GeoForschungsZentrum Potsdam, Telegraphenberg, D-14473 Potsdam, Germany

^* corresponding author, e-mail: hjmuel{at}gfz-potsdam.de

A key question to all high-pressure research arises from the reliability of pressure standards. There is some indication and discussion of an uncertainty of 10–20 % for higher pressures in all standards. Independent and simultaneous investigation of the dynamical (ultrasonic interferometry of elastic wave velocities) and static (XRD-measurement of the pressure-induced volume decline) compressibility on a sample reveal the possibility of a standard-free pressure calibration and, consequently an absolute pressure measurement. Ultrasonic interferometry is used to measure velocities of elastic compressional and shear waves in the multi-anvil high-pressure device MAX80 at HASYLAB Hamburg enabling simultaneous XRD and ultrasonic experiments. Two of the six anvils were equipped with lithium niobate transducers of 33.3 MHz natural frequency. NaCl was used as pressure calibrant, using the EoS of Decker (1971), and sample for ultrasonic interferometry. From the ultrasonic wave velocity data we calculated the compressibility of NaCl as a function of pressure independent from NaCl-pressure calibrant. The results were compared with data of static compression experiments up to 5 GPa (Bridgman, 1940) and up to 30 GPa (Birch, 1986) using experimental data from Boehler & Kennedy (1980) and Fritz et al. (1971). At 1.2 GPa and 5.3 GPa the results of static compression data agree with our velocity-derived compressibility data. In the range between 2 and 4GPa our dynamical data have 1.5–3% higher values. The pressure revealed according to Decker (1971) is in accordance to our standard-free pressure calibration. Consequently, up to 8 GPa the NaCl pressure standard has a reliability of at least 1%. However, there is some evidence that at higher pressures the inaccuracy of the NaCl standard becomes >> 1%.

Key-words: pressure calibration, compressional wave velocity, shear wave velocity, sodium chloride, multi-anvil high-pressure cell.

This article has been cited by other articles:

				C. Lathe, M. Koch-Muller, R. Wirth, W. Van Westrenen, H.-J. Mueller, F. Schilling, and J. Lauterjung The influence of OH in coesite on the kinetics of the coesite-quartz phase transition American Mineralogist, January 1, 2005; 90(1): 36 - 43. [Abstract] [Full Text] [PDF]