Monocrystalline material was studied, using 87Sr nuclear and Co2+ electronic spin lattice relaxation measurements and pulsed excitation techniques, with regard to the temperature dependence of the dynamics of 2 defects. The samples were ultra-pure, or contained paraelectric OH- defects (100 or 700ppm) and paramagnetic Co2+ defects (100ppm), respectively. The 87Sr nuclear magnetic resonance experiments were carried out, between room temperature and about 10K, at Larmor frequencies of 7.7 or 15.6MHz. The Co2+ electron spin resonance was observed at 9.1GHz, between 2 and 9K. The 87Sr nuclear magnetic resonance spectrum consisted of a single sharp line, because of the cubic structure, whereas the Co2+ electron spin resonance exhibited an octet. A rotational motion of paraelectric OH-, electronic spin flips of paramagnetic Co2+, and a rotational motion of off-center Co2+ were deduced from the data.

S.Assmann, O.Kanert, R.Küchler, J.Wegener, L.S.Sochava: Materials Science Forum, 1997, 239-241, 349-52