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.
X-ray diffraction patterns were obtained, using improved technique, for liquid sulfur at 80°C (supercooled), 120°C, 165°C, 200°C, 240°C, and 300°C; and for amorphous sulfur at 4°C and for powdered crystalline orthorhombic sulfur at 23°C, confirming reported new details at small angles and extending observations to nearly twice the range of (sinθ)/λ heretofore reported. Atomic distribution curves are presented for all these cases. Nearest neighbor distances and numbers remain constant throughout at 2.07 A and 2 atoms, respectively, but other features of the distribution curves change with temperature. New results with neutron diffraction at 120°C are compared with these x-ray results.
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