Crystal and magnetic structure of Pmnb-Li2FeSiO4
The orthosilicates Li$_2FeSiO$_4$ are discussed as new high-capacity battery materials. We have recently grown the first small (ca. 10 mg) $\gamma$-Li$_2FeSiO$_4$ single crystals and the crystal structure was solved for the first time. Magnetic studies imply an antiferromagnetic ground state with a N\'eel-temperature of \tn\ = 17.0(5)\,K. The easy magnetic axis corresponds to the crystallographic $a$-axis. Despite a reasonably small anisotroy of 0.5 meV inferred from our high frequency ESR studies, magnetic fields of 15 T do not yield the spin-flop state. In addition, our high frequency ESR data imply short range AFM order up to around 150 K. We assume a non-trivial magnetic ground state in a frustrated magnetic system. We hence propose to study the magnetic structure of polycrystalline $\gamma$-Li$_2FeSiO$_4$ using neutron diffraction. In addition, we propose to investigate the crystal structure of $\gamma$-Li$_2FeSiO$_4$ by means of neutron diffraction because potential Li-site exchange is supposed to be relevant for the usage of this material for lithium-ion batteries.
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KLINGELER Rüdiger; ENDERLE Mechthild; HERGETT Waldemar; KOO Changhyun; NEEF Christoph; RITTER Clemens and SPACHMANN Sven. (2018). Crystal and magnetic structure of Pmnb-Li2FeSiO4. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2539
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