SPI Supplies

SPI Molybdenum Trioxide Specimen

Widely used for calibrating the rotation between the image and diffraction pattern

For studies involving selected area electron diffraction, there is a "rotation" of the image when switching from the selected area bright field mode to the diffraction mode. Often times there is a great need to know precisely, the amount of this rotation, in order to make proper interpretation of results.

The easiest way to do this is to photograph first the image of the crystal being characterized and then record on a different (or as a double exposure on the same) plate or film, the diffraction pattern. A good test sample must have crystals of well defined faces (for the known orientation) and also, a sharp well defined diffraction pattern, and at the same time, the crystal must be "robust" enough so that it is not quickly degraded by the beam.

Some years ago it was discovered that molybdenum trioxide is the ideal kind of specimen for this kind of application. For those wanting to either make their own or else use the production of such a sample as part of a class room exercise, we have made available the details for making this sample in your own laboratory.

Note: We have found that the crystals tend to have a longer shelf life if they are shipped in an SPI Slide-A-Grid box instead of the more common gelatin capsule method, hence the price includes one Slide-A-Grid box.

Price includes one Slide-A-Grid™ Box

Molybdenum trioxide specimen
SPI #EachIn Stock
3.05 mm copper grid 02696-AB $26.34 Add to cartYes
2.3 mm copper grid 02696A-AB  29.13 Add to cartYes

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Thursday September 03, 2015
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