Work function of the (100) faces of single crystals of refractory metal alloys

Results of measurement of the work functions of the (100) faces of two tungsten-base alloys and one tantalum-base alloy are presented. The crystals studied, of W-Re 5, W-Ta 1 and Ta-Mo 20, were grown by zone equalization and had spontaneous (100) orientation. The work functions of the W-Re 5 and Ta-Mo 20 alloys were close to (100) of pure W and Mo, and they were considerably below the work functions of the (100) faces in W and Ta for W-Ta 1 alloy.