Yes! Ta a lot for that, Jim.
Matthew On Tue, 2 Aug 2022 at 21:45, Cline, James P. Dr. (Fed) <james.cl...@nist.gov> wrote: > From my Vol H article: > > > > Mounting of powder specimens for analysis using Bragg-Brentano geometry is > a non-trivial process that typically requires 20 min to 30 min. The > objective is to achieve a maximum in packing density of the powder with a > smooth, flat surface. A 5 μm displacement error in the position of the > sample surface will have a noticeable impact on the data collected. > Side-drifted mounts allow for realization of a flat surface with relative > ease, though maximizing the density of the compact can be challenging. > Top-mounted specimens can be compacted using a glass plate or bar that > allows the operator to see the sample surface through the glass and, in > real time, determine the success or failure in obtaining the desired > outcome. Some powders, such as that of SRM 640e, “flow” in the mount with > the oscillation of the glass plate across the sample surface. Others, such > as SRM 676a do not flow at all; but can be “chopped” into the holder and > compacted with a single “squish”. Several attempts may be necessary to > realize a quality mount. A low-wetting-angle, low-viscosity silicone-based > liquid resin, such as those marketed as vacuum leak sealants in high vacuum > operations, can be used to infiltrate the compact once mounted; resulting > in a stable sample that will survive some degree of rough handling. > > > > This is actually from the J Res NIST version. The Oxford English > Dictionary doesn’t approve of the word “squish” for use in sample > preparation, so it’s not used in the actual Volume H publication. > > > > Jim > > > > > > James P. Cline > Materials Measurement Science Division > National Institute of Standards and Technology > 100 Bureau Dr. stop 8370 [ B113 / Bldg 217 ] > Gaithersburg, MD 20899-8523 USA > james.cl...@nist.gov > > https://www.nist.gov/people/james-p-cline > (301) 975 5793 > > > > *From:* rietveld_l-requ...@ill.fr <rietveld_l-requ...@ill.fr> *On Behalf > Of *Matthew Rowles > *Sent:* Monday, August 1, 2022 9:37 PM > *To:* RIETVELD_L Distribution List <rietveld_l@ill.fr> > *Subject:* Making a permanent reference sample from SRM 640 or 660? > > > > Hi all > > > > A while ago, I seem to recall reading a procedure or description on making > a permanent reference sample from SRM 640 or 660 that involved pressing the > sample in a specimen holder and then infiltrating with a low-viscosity > epoxy. > > > > Does that ring any bells with anyone? Does anyone know of any websites , > books, or papers describing such a thing? > > > > Thanks > > > > Matthew Rowles > > >
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