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The compound BaFe2Se3 (Pnma) has been synthesized in the form of singlecrystals with the average composition Ba0.992Fe1.998Se3. The Moessbauerspectroscopy used for investigation of the valence states of Fe in thiscompound at temperature ranging from 4.2 K till room temperature revealed theoccurrence of mixed-valence state for iron. The spectrum is characterized bysharply defined electric quadrupole doublet above magnetic ordering at about250 K. For the magnetically ordered state one sees four iron sites at least andeach of them is described by separate axially symmetric electric field gradienttensor with the principal component making some angle with the hyperfinemagnetic field. They form two groups occurring in equal abundances. It islikely that each group belongs to separate spin ladder with various tilts ofthe FeSe4 tetrahedral units along the ladder. Two impurity phases are found,i.e., superconducting FeSe and some other unidentified iron-bearing phase beingmagnetically disordered above 80 K. Powder form of BaFe2Se3 is unstable incontact with the air and decomposes slowly to this unidentified phaseexhibiting almost the same quadrupole doublet as BaFe2Se3 above magnetictransition temperature.

Magnetism of BaFe2Se3 studied by M\"ossbauer spectroscopy