PMID- 19045909
OWN - NLM
STAT- MEDLINE
DCOM- 20090212
LR  - 20131121
IS  - 1089-7623 (Electronic)
IS  - 0034-6748 (Linking)
VI  - 79
IP  - 11
DP  - 2008 Nov
TI  - Containment of fluid samples in the hydrothermal diamond-anvil cell without the 
      use of metal gaskets: performance and advantages for in situ analysis.
PG  - 115103
LID - 10.1063/1.3013788 [doi]
AB  - Metal gaskets (Re, Ir, Inconel, or stainless steel) normally used to contain 
      fluid samples in the hydrothermal diamond-anvil cell (HDAC) are sometimes 
      undesirable due to possible contamination and to gasket deformation at high 
      pressures and temperatures resulting in nonisochoric behavior. Furthermore, in 
      x-ray spectroscopic experiments, metal gaskets may attenuate the incident x-ray 
      beam and emitted fluorescence x-rays, and the interaction of scattered radiation 
      with the gasket may produce fluorescence that interferes with the x-ray spectrum 
      of the sample. New arrangements and procedures were tested for the operation of 
      the HDAC without using the metal gaskets. Distilled, de-ionized water was loaded 
      into the sample chamber, a laser-milled recess 300 microm in diameter and 
      approximately 50 microm deep centered in the 1.0 mm face of the lower diamond 
      anvil, and sealed by pressing the top diamond anvil face directly against the 
      lower one without a metal gasket in between. A maximum sample pressure of 202 MPa 
      at 617 degrees C was maintained for a duration of 10 min without evidence of 
      leakage. A small change in fluid density was observed in one experiment where the 
      sample was held at 266 MPa at 708 degrees C for 10 min. The gasketless HDAC was 
      also employed in x-ray absorption spectroscopy experiments, where, in addition to 
      the sample chamber in the lower diamond, two grooves were milled at a 90 degrees 
      angle to each other around the sample chamber to minimize the attenuation of 
      incident and fluorescent x rays. With a minimum distance between the sample 
      chamber and the grooves of 80 microm, a pressure of 76 MPa at 500 degrees C was 
      maintained for 2 h with no change in the original fluid density.
FAU - Chou, I-Ming
AU  - Chou IM
AD  - National Center, U.S. Geological Survey, Reston, Virginia 20192, USA. 
      imchou@usgs.gov
FAU - Bassett, William A
AU  - Bassett WA
FAU - Anderson, Alan J
AU  - Anderson AJ
FAU - Mayanovic, Robert A
AU  - Mayanovic RA
FAU - Shang, Linbo
AU  - Shang L
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PT  - Research Support, U.S. Gov't, Non-P.H.S.
PL  - United States
TA  - Rev Sci Instrum
JT  - The Review of scientific instruments
JID - 0405571
RN  - 059QF0KO0R (Water)
RN  - 7782-40-3 (Diamond)
SB  - IM
MH  - Absorptiometry, Photon
MH  - Atmospheric Pressure
MH  - Diamond/*chemistry
MH  - Equipment Design
MH  - Specimen Handling/*instrumentation
MH  - Temperature
MH  - Time Factors
MH  - Water/chemistry
EDAT- 2008/12/03 09:00
MHDA- 2009/02/13 09:00
CRDT- 2008/12/03 09:00
PHST- 2008/12/03 09:00 [pubmed]
PHST- 2009/02/13 09:00 [medline]
PHST- 2008/12/03 09:00 [entrez]
AID - 10.1063/1.3013788 [doi]
PST - ppublish
SO  - Rev Sci Instrum. 2008 Nov;79(11):115103. doi: 10.1063/1.3013788.