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- W2074622831 abstract "Neutron diffraction experiments were carried out in the temperature range from 1.5 to 295 K on a polycrystalline sample of manganese(II) oxalate dihydrate MnC2O4.2D2O, a system composed of linear chains of oxalato-metal groups. In the course of this study the monoclinic space group C2/c has been confirmed and structural parameters have been refined, using the Rietveld profile-fitting procedure. An appreciable change ( approximately=2%) of the lattice constant a in the temperature range from 100 to 295 K has been observed. At 1.5 K the neutron diagram reveals a group of weak and closely spaced Bragg reflections arising from the magnetic ordering of Mn2+ ions. Indexed on the basis of a magnetic unit cell with lattice constants am=6a, bm=2b and cm=c the observed structure is best described as an antiferromagnetic cone spiral, which the cone axis perpendicular to the b-c plane and the value of the magnetic moment equal to (3.7+or-0.4) mu B. The resulting fundamental and spiral components are equal to (1.6+or-0.1) mu B and (3.4+or-0.4) mu B, respectively. The temperature dependence of the magnetic reflection 511 yields TN=2.60+or-0.05 K. On the other hand, the temperature dependence of bulk magnetic susceptibility exhibits a rounded maximum in the vicinity of 10 K. A consistent description of the magnetic behaviour of MnC2O4.2D2O at low temperatures has been achieved by assuming that intra-chain interactions between magnetic ions are much stronger than the inter-chain couplings. The fit of the magnetic susceptibility based on Fisher's results (1964) for a linear Heisenberg chain yielded J/kB=-1.22+or-0.01 K." @default.
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- W2074622831 date "1987-05-30" @default.
- W2074622831 modified "2023-09-23" @default.
- W2074622831 title "Magnetic ordering of the linear chain system manganese oxalate dihydrate investigated by means of neutron diffraction and bulk magnetic measurements" @default.
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- W2074622831 doi "https://doi.org/10.1088/0022-3719/20/15/011" @default.
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