Thermal expansion and cation partitioning of MnFe2O4 (Jacobsite) from 1.6 to 1276 K studied by using neutron powder diffraction. (January 2015)

• Record Type: Journal Article
• Authors: Levy, Davide; Pastero, Linda; Hoser, Andreas; Viscovo, Gabriele
• Is Part Of: Solid state communications. Volume 201(2015)
• Page Start: 15
• Page End: 19
• Publication Date: 2015-01
• Subjects: Magnetic materials -- Chemical synthesis -- Neutron scattering and diffraction -- Rietveld analysis; Solid state chemistry -- Periodicals; Solid state physics -- Periodicals; Chimie de l'état solide -- Périodiques; Physique de l'état solide -- Périodiques; 530.41
• DOI: 10.1016/j.ssc.2014.10.001
• Languages: English
• ISSNs: 0038-1098

Abstract

Abstract: MnFe2 O4 is a low-cost and stable magnetic spinel ferrite. In this phase, the influence of the inversion degree on the magnetic properties is still not well understood. To understand this relationship, Mn-ferrite was synthesized by a chemical co-precipitation method modified in our laboratory and studied by using the Neutron Powder Diffraction from 1.6 K to 1243 K. A full refinement of both crystal and magnetic structures was performed in order to correlate the high-temperature cation partitioning, the Curie transition and the structure changes of the Mn-ferrite. In this work three main temperature intervals are detected, characterized by different Mn-ferrite behaviors: first, ranging from 1.6 K to 573 K, where MnFe2 O4 is magnetic; second, from 573 K to 623 K, where MnFe2 O4 becomes paramagnetic without cation partitioning; and lastly, from 673 K to 1243 K, where cation partitioning occurs. Highlights: Mn-ferrite was synthesized by a modified chemical co-precipitation method. The material was studied by Neutron Powder Diffraction. Diffraction experiments were performed at variable temperature from 1.6 K to 573 K. Three temperature intervals and related magnetic behavior were identified.