Powder diffraction data for borides Pd3B and Pd5B2 and the formation of anamorphous boride Pd2B

Powder diffraction data and refined unit cell parameters of two palladium b orides were determined. For Pd3B (space group Pnma; Fe3C type) it was found that a = 0.54602(3) nm, b = 0.75596(4) nm, c = 0.48417(4) nm and for Pd5B2 (space group C2/c; Mn5C2 type) a = 1.27759(12) nm, b = 0.49497(5) nm, c = 0.54704(4) nm, beta = 97.049(7)degrees. Further, it was shown that the posi tion of the principal scattering peak of the amorphous Pd2B fulfils the Nag el-Tauc criterion about glass forming ability. (C) 2001 International Centr e for Diffraction Data.