Structural and magnetic properties of DyMn2D6 synthesized under high deuterium pressure

• Published in: Journal of physics. Condensed matter 2009-01, Vol.21 (1), p.016001-016001 (6)
• Main Authors: Paul-Boncour, V, Filipek, S M, Wierzbicki, R, André, G, Bourée, F, Guillot, M
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Domain effects, magnetization curves, and hysteresis; Exact sciences and technology; Inorganic compounds; Magnetic properties and materials; Magnetically ordered materials: other intrinsic properties; Magnetization curves, magnetization reversal, hysteresis, barkhausen and related effects; Physics; Saturation moments and magnetic susceptibilities; Structure of solids and liquids; crystallography; Structure of specific crystalline solids
• ISSN: 0953-8984; 1361-648X
• DOI: 10.1088/0953-8984/21/1/016001

DyMn2D6 has been prepared by applying high gaseous deuterium pressure on DyMn2. This phase is isostructural with other RMn2D6 (R = Y, Er) compounds and crystallizes with a K2PtCl6 type structure having an ordered anion and a partially disordered cation arrangement because Dy and half the Mn atoms are randomly substituted in the same 8c site. The reverse susceptibility follows a Curie-Weiss law with an effective moment of 10 muB similar to that of DyMn2. Short range magnetic order, corresponding to ferromagnetic correlations, is observed in the neutron patterns up to 10 K and can be attributed to Dy-Dy interactions. The decomposition of the deuteride into Mn and DyD2, studied by thermal gravimetric analysis, occurs between 470 and 650 K. A further deuterium desorption takes place above 920 K.