Neutron powder diffraction study of Mn-bearing hematite, α-Fe2-xMnxO3, in the range 0 ≤ x ≤ 0.176

A detailed neutron powder diffraction and calorimetric study Was conducted to determine the influence of increasing Mn-substitution on the crystal and,the magnetic structures of hematite, alpha-Fe2O3. The study was initiated to determine, if Mn substitution may be responsible for unusual ferromagnetic properties of natural hematite samples from the Kalahari Mn field, South Africa. Natural as well as synthetic Mn-bearing, hematite samples with the compositional range Fe2-xMnxO3 (x = 0 to 0.176) were examined. Calorimetric measurements were performed to determine the Neel T-N and the Morin T-M temperature transitions. All studied hematite samples, irrespective of chemical composition, display weak ferromagnetism at 295 K and, coexistence of weak ferromagnetic and antiferromagnetic phases, at 10 K. A slight decrease of the total magnetic moment and TM but a drastic decrease of T-N can,be, attributed, to increasing Mn-substitution. The results illustrate that Mn substitution may contribute but cannot be the sole reason for the unusual magnetic properties of natural hematite samples. (c) 2005 Elsevier SAS. All rights reserved.