Abstract
Abstract The europium(II) orthoborate Eu3(BO3)2 is trigonal, space group R\bar3c, with a=9.069(1), c=12.542(2) Å and Z=6. The structure has been refined to R=0.082 for 259 observed reflections with isotropic thermal parameters. The borate contains isolated and planar triangle BO33− ions, the anions and Eu atoms being hexagonally packed along c. Each Eu atom is surrounded by 8 oxygens with Eu–O distances varying from 2.36 to 2.95 Å. The interatomic distances between Eu atoms are 3.509–4.200 Å for 8 nearest Eu neighbors and 4.831–5.450 Å for 6 second-nearest Eu neighbors. The 6 nearest Eu neighbors with the interatomic distances of 3.509 and 3.778 Å and the 4 second-nearest Eu neighbors with the Eu–O–Eu angle of 166.0° are effective for the magnetic exchange and superexchange interactions between Eu2+ ions, giving rise to ferromagnetism at low temperature.
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