A complex temperature dependence of a.c. susceptibility of Y2Fe17 under high pressures together with recent neutron diffraction studies under pressure proved the instability of the collinear ferromagnetic structure and the development of a non-collinear magnetic arrangement of Fe moments in Y2Fe17. To study the correlation between magnetic structure and volume in more detail we performed compressibility and linear thermal expansion studies under high pressures up to 100 kbar and 10 kbar, respectively. The compressibility in the paramagnetic state κp (above 10 kbar at room temperature) was determined from the Murnaghan equation of state using the X-ray data, κp = 0.80 Mbar-1. The linear thermal expansion and compressibility in the ferromagnetic state at low temperatures are highly anisotropic. As a consequence, the c/a ratio decreases with increasing pressure. The magnetic phase diagram of Y2Fe17 compound was compiled up to 20 kbar.
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