The magnetovolume effects and magnetic anisotropy of the new Ce3(FeTi)29and Ce3(FeCr)29compounds have been studied by measuring their linear thermal expansion (LTE), pressure dependence of the Curie temperatureTc, compressibility, and anisotropy field. The value ofTc, its pressure dependencedTc/dp, and anisotropy fieldHAfor the Ce(FeCr)12phase are also reported. The linear thermal expansion of these compounds exhibits Invar‐like behavior with large positive values of the spontaneous magnetostriction atTc[e.g., &ohgr;s(0)≊1.2% in Ce3(FeTi)29]. Different values of the compressibility have been observed in the ferromagnetic and paramagnetic states of Ce3(FeTi)29(&kgr;f=1.25×10−3kbar−1and &kgr;p=1.12×10−3kbar−1) in qualitative agreement with the large magnetovolume effect observed in the LTE.Tcfor all the phases studied decreases under pressure with initial slopesdTc/dp=−3.75, −3.6, and −2.7 K/kbar for Ce3(FeTi)29, Ce3(FeCr)29, and Ce(FeCr)12, respectively. Two anisotropy fields have been detected in Ce3(FeTi)29associated with saturation along theb(HA) andc(H′A) axes of the monoclinic structure. The temperature dependence ofH′Afor Ce3(FeCr)29andHAfor Ce(FeCr)12is also reported. ©1995 American Institute of Physics.