The spin-lattice relaxation times T1 of an unstable nucleus 19O (T1/2 = 26.9 s, I = 5/2) implanted into Y2O3 stabilized ZrO2 (YSZ), which is a solid oxide fuel cell material, were measured at T = 278 − 333 K by means of the β-NMR technique, using a highly spin polarized 19O beam produced via the heavy ion reaction. The motional correlation times τc for oxygen motion derived from the T1 data are on the same straight line on the Arrhenius plot as those derived from the previous 17O-NMR data at above the room temperature. This indicates that 19O ions implanted into YSZ from outside seem to exhibit the same behavior as oxygen ions in the host YSZ material.