We currently manufacture monochromator crystals from quartz, silicon, and germanium. 

There are many possible orientations for quartz and fewer for silicon and germanium.  Examples of quartz orientations are (2023), (1011), and (1010).  Silicon and germanium orientations include (220), (111), and (400).  A fairly complete listing of useful orientations for these three crystals is given at the end of this note along with 2d spacings.

All monochromators that we manufacture are done on a custom basis. 

If you can give us an orientation and dimensions for a flat crystal, we can go from there in terms of offering a quotation.  Please, also include the quantity that you need.  Crystal surfaces can be either ground or polished, depending on your specific requirements.  Our polished surfaces of quartz produce Bragg angles with about 10 arcseconds of angular spread for quartz and about 20 arcseconds for either silicon or germanium when used with Cu K-alpha radiation.  Unless specified, we assume the crystals will be polished

Crystal: Quartz SiliconGermanium

Here are general guidelines for choosing dimensions, based on our present capabilities. 

If toroidally bent, radii should be in the range of 0.2 meters to 1.0 meters.  If spherically bent, then the radius can be up to 2.0 meters and longer. 

Finished crystal size is dependent on 1) the availability of large, high quality raw crystals, and 2) the ability of the crystal to bend to the required radius or radii.  A convenient strip for bending is 50 mm x 15 mm.  Such rectangular crystal strips, which are in the ration of 1:0.3, can be manufactured with a maximum size of ~100 mm x 30 mm.  For ease of manufacture, the maximum circular crystal is about 50 mm.  These circular crystals can be used when the backing radius is in the several meter range.

The above dimensional comments are meant as rough guidelines only.  We always are pleased to consider the specifics of your application, even though they may not be an exact match to these guidelines.

Quantity:

In case you are interested in curved crystals, then you may find our datasheet on toroidally figured crystals informative.

Applications for these toroidally curved X-ray crystals include use in analytical chemistry micro-probes (or ESCA), in monochromatic imaging of hot plasmas, and in ultra-fast probing of structural changes in materials. 

Large-area elements can be assembled from single crystals if the bend radius is large, or from a mosaic of smaller crystals.

Selected X-Ray Data

Selected Data for Inter-Planar Spacing of Quartz, Silicon, and Germanium

Data for the table below was extracted from Table 4-1 of the “X-Ray Data Booklet”, second edition, January 2001, Lawrence Berkeley National Laboratory, University of California, Berkeley, CA 94720.  Note, we have added the Ge(400) entry to this table.