Abstract
The structure of the diphosphate ZnMnP 2 O 7 is determined on powder by the Rietveld method. It is of monoclinic symmetry C2/m. The cell parameters are: a = 6.6141(3) A, b = 8.4366 (3) A, c = 4.5305(2) A and b = 103.948(2) °. The structural framework is built by MO 6 octahedron planes where M is a mixed site statistically occupied by Zn 2+ and Mn 2+ ions. These planes are parallel to the crystallographic plane (001) and are linked together by sheets of P 2 O 7 4- groups. The value of the paramagnetic temperature Q p is -4 K, which proves that the interactions are antiferromagnetic . The magnetic specific heat of this compound has a symmetric maximum at T = 5.3 K less acute compared to that of Mn 2 P 2 O 7 of isotypic structure which is of l type . This behavior change can be explained by the interruption of three-dimensional interactions between Mn 2+ ions which become limited to 2D order when 50% of these ions are replaced by Zn 2+ ions.
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