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PACS 75.80.+q The magnetostriction of a polycrystalline NdFe 11 Ti compound in the temperature range 77 -300 K and in magnetic fields up to 15 000 Oe has been investigated. Below 160 K the magnetostriction is found to be negative. On increasing the temperature the sign of the magnetostriction changes and it reaches a maximum value at about 220 K. At about 160 K anisotropic magnetostriction becomes zero and volume magnetostriction increases rapidly beyond this temperature. The results are interpreted in terms of spin reorientation phenomena. This conclusion is confirmed from the measurement of low-field ac susceptibility in the temperature range 100 -300 K.

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