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Measurements of magnetostrictive strains in some RCo3 (RGd, Th, Dy, Ho and Er) compounds are carried out between 77K and room temperature. Magnetic fields up to 1.8 T are applied. The largest magnetostriction is observed in TbCo3. The measurements confirm the high anisotropy of most of these materials. The results of temperature dependence of magnetostriction for Tbco3 and HoCo3 are interpreted in terms of single‐ion magnetoelastic theory. The results indicate that the rare‐earth ion is the main source of the magnetostriction in these compounds. Large volume strains (≈ 10−4), which are associated with the volume dependence of the magnetic anisotropy, are observed in some of the RCo3 compounds. These strains are found to be strongly temperature‐dependent.

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