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Pd2B is zeta iron carbide structured and crystallizes in the orthorhombic Pnnm space group. The structure is three-dimensional. Pd is bonded in a 3-coordinate geometry to three equivalent B atoms. There are two shorter (2.13 Å) and one longer (2.15 Å) Pd–B bond lengths. B is bonded to six equivalent Pd atoms to form a mixture of edge and corner-sharing BPd6 octahedra. The corner-sharing octahedral tilt angles are 51°.
It is shown that there are two types of beam plasma discharge observed in rocket shots. The second BPD transition (BPD2) is characterized by a very broad featureless emission extending from much less than the cyclotron frequency to several times the plasma frequency. The characteristic spectra observed close to the beam plasma discharge region are deformed by the intervening plasma when observations are made at a distance from the injection field line and lead to spectra which must be interpreted with care. In one case, the Bernstein mode at 2 fce seems to be a remnant of the broad, featureless spectrum of BPD2.