New template-free layered Manganese(III) phosphate: Hydrothermal synthesis, ab initio structural determination, and magnetic properties

resumo

A new template-free layered manganese(III) phosphate, Na3MnH(P0.9O4)(2), has been hydrothermally synthesized. The crystal structure was solved ab initio from powder X-ray diffraction data, and the model was confirmed using the Rietveld method. The material crystallizes in triclinic space group P (1) over bar (No. 2) with lattice parameters a = 5.2925(2) angstrom, b = 6.9004(3) angstrom, c = 5.2452(3) angstrom, alpha = 91.56(0)degrees, beta = 116.95(0)degrees, gamma = 90.5(0)degrees, and Z = 1. The structure consists of [Mn(P0.9O4)(2)]infinity layers composed of isolated MnO6 octahedra connected via corner-sharing asymmetric PO4 tetrahedra. The interconnection between the layers is assured by Na+ cations, which reside in the interlayered space. The system is paramagnetic above 50 K, with an effective paramagnetic moment of 4.85(3),mu(B), ascertaining the Mn3+ valence state of the Mn ions. Antiferromagnetic short-range-order effects are observed below 26.5 K.

palavras-chave

OCTAHEDRAL MOLECULAR-SIEVES; CRYSTAL-STRUCTURE; POWDER DIFFRACTION; OXIDATION; OXIDE; PYROPHOSPHATE; KINETICS

categoria

Chemistry; Materials Science

autores

Ferdov, S; Lopes, AML; Lin, Z; Ferreira, RAS

nossos autores

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