Specific heat, thermal expansion and electrical resistivity measurements on PrB6 single crystals show that there are two low temperature phase transitions at 6. 9 K and 4. 2 K, respectively, the latter temperature varying somewhat among different crystals.Neutron diffraction measurements were made on both single and polycrystalline samples of PrB6. The neutron data indicate a spontaneous incommensurate magnetic ordering at 6. 9 K with 0 = (0. 23, 0. 23, 0. 5) 21T/a0. At 4. 2 K a commensurate magnetic phase is seen with 0 (0. 25, 0. 25, 0. 5) ZTT/a0 coexisting with the incommensurate phase At 1.74 1<, only the commensurate phase remains.A model is proposed for the commensurate antiferromagnetic structure and a profile analysis based on that model yields a magnetic moment of 1.77 Bohr magnetons per praseodymium ion at 1.74 K.
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