High purity, refractory metal single crystals are now available from Accumet Materials Co.  Crystals of Tungsten, Tantalum, Molybdenum, and Niobium are grown by electron beam float zone refining techniques under high vacuum.  They can be produced in diameters of 1/2" to 8".  These crystals can be  oriented to within +/-1/2 degree of accuracy and can be cut into highly polished, strain-free discs.  These discs are used for surface chemistry research and low energy electron diffraction studies (LEED).

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