Metal Single Crystals
Production of metallic single crystals is carried out in most modern equipment with highest quality requirements. For crystal growth using the Bridgman-, Czochralski- and zone melting techniques only highest purity starting materials are used. The following metallic single crystals are normally available from the shelf. Please click on view to choose your geometry:
Alloy crystals such as Cu2Ce, CuAu, Cu3Au, Cu3Pd, Cu3Pt, Cu75Mn25, CuNi,CoAl, CoGa, FeAl, FeCr, Fe85Cr15, Fe64Ni36, Fe80Ni20, Nb90W10, NiAl ,Ni3Al, Ni3Al (+Fe), NiFe, Pd97Ni3, Pt7Ni, Pt75Ni25, Pt48Ni52, Pt3Cu, PtCo3, Pt3Cr, Pt10Pd90, PtPd, Pt90Pd10, PtRh, Pt80Rh20, Pt90Rh10,Pt95Rh5, TbCu2, V3Si, W99Re1 are partially on stock as well. Further unlisted alloy crystals can be grown according to specifications of the customer.
Orientation and Polishing
The standard orientations offered for the above crystals are for the cubic system (001), (110) and (111) for hexagonal crystals (0001), (10-10) und (11-20). Other orientations such as (117), (221) or (112) may also be produced, of course. The standard accuracy of the orientation of cut crystals is within
< 2°. By surface polishing an accuracy of
< 0,1° is achievable. Polishing of the different crystals is performed very gently and where possible done chemomechanically. A surface roughness of better than
< 0,03µm is obtained. Based on such a polish an atomically smooth surface may be prepared with a few sputter- and heating cycles or by flame annealing. (Recipes for the surface preparation in UHV are available on request). Given an orientation accuracy of
< 0,1° terrace widths of several thousand Angstrom are achieved.
Metallic single crystals are usually pulled in form of rods. Depending on the metal the rod diameter can be set to values between several millimeters to 100 mm. These rods can be supplied either as raw crystals without further shaping or cut to discs. A standard disc thickness is 1mm. Thicker or thinner discs are supplied on request.
The crystal geometry is shaped according to specifications of the customer by spark erosion. Special geometries, grooves, holes and reference faces (for instance, to indicate a second orientation) are possible without problems. Below a few common examples are listed.
For crystal offers or orders just fill in your desired measures and send us these drawings. - If your design is not included, please fax us your drawing or hand sketch.
"Hat form" with indication of second orientation:
Circular groove, reference face to mark a second orientation and hole for a thermocouple:
Holes for keeping crystal in place: