The intrinsic so-called self-trapped hole center in crystalline samples was identified by using electron paramagnetic resonance and electron-nuclear double resonance techniques. These defects, which were labelled as [D2PO4]0 centers, could be formed at 77K by irradiation with 60kV X-rays or with the fourth harmonic (266nm) of a pulsed Nd:YAG laser. It was concluded that the hole was equally shared by 2 adjacent O ions, and hyperfine interactions with one P atom and 2 equivalent D atoms were observed. The present sample was approximately 80% deuterated. Thus, both [D2PO4]0 and [HDPO4]0 centers were detected, with the former being predominant.

Identification of the Intrinsic Self-Trapped Hole Center in KD2PO4. K.T.Stevens, N.Y.Garces, L.E.Halliburton, M.Yan, N.P.Zaitseva, J.J.DeYoreo, G.C.Catella, J.R.Luken: Applied Physics Letters, 1999, 75[11], 1503-5