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NaFeGe 2 O 6 is a one of the representatives of the pyroxene family with the general formula Me 1+ Me 3+ Si(Ge) 2 O 6 (Me 1+ -monovalent metal cation, Me 3+ -3-d transition metal cation), which regained strong interest in spintronics as a new class of multiferroic materials and in solid-state physics as a quasi-low-dimensional insulating system. The sodium iron germanate NaFeGe 2 O 6 powder was synthesized at 800º, 900º C for 4 days from the stoichiometric mixture of Na 2 CO 3 , Fe 2 O 3 , GeO 2 by solid state reaction after several cycles of regrinding. Using neutron powder diffraction the magnetic order below T N ≈ 13 K was found and the magnetic structure has been determined. It is incommensurate and consists of antiferromagnetically coupled Fe 3+ pairs with helical modulation within the a-c plane of the crystal lattice.

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