The magnetizations of phosphates and vanadates of rare-earth elements RXO 4 (R=Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er and Yb, and X=P and V) were studied in the temperature range of 1.9°K to 630°K. There were not found any magnetic transitions between 4.2°K and 630°K for all system, while F. F. Y. Wang et al. reported some antiferromagnetic transitions for GdPO 4 , TbPO 4 (zircon structure) and DyPO 4 at 225°K, 415°K and 505°K, respectively. Below 4.2°K, TbPO 4 (zircon structure) and DyVO 4 showed the metamagnetic-like behaviours and seemed to have antiferromagnetic transition points between 1.9°K and 4.2°K. Above 200°K, the magnetizations of all materials followed the Curie-Weiss law. The slope of inverse susceptibility vs temperature plots suggest that the magnetic moments localized on these materials come from those of trivalent cations R 3+ . The nuclear magnetic resonances (NMR) of P 31 and V 51 in these materials were measured at room temperature. The NMR shifts of P 31 were very small (-0.015%∼+0.038%) and any resonances were not observed for DyPO 4 , HoPO 4 and ErPO 4 . As for the V 51 NMR, no resonances were observed except for the NdVO 4 , which was also small (-0.053%). No arguments were made for SmPO 4 and EuPO 4 because of their extremely small susceptibilities.23:T4d5,Néel temperature and ferrimagnetic resonance linewidth measurements were carried out in the composition Y 3-2x-y Ca 2x+y Fe 5-x-y M y V x O 12 , where M=Zr or Ti. It was revealed, that both of the Zr and Ti substitutions in this system reduced the value of K 1 /M s effectively, and this led to the remarkable linewidth reduction. The lowest value of linewidth obtained was 1.8 Oe at the composition of x=0.4 and y=0.4 for M=Zr.

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