Marinite
Li<sub>2</sub>M(SO<sub>4</sub>)<sub>2</sub> (M = Co, Fe, Mn) and Li<sub>1</sub>Fe(SO<sub>4</sub>)<sub>2</sub>: Model Compounds for Super-Super-Exchange
Magnetic Interactions
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Abstract
New
materials initially designed for battery electrodes are often of interest
for magnetic study, because their chemical compositions include 3d
transition metals. We report here on the magnetic properties of marinite
phases Li<sub>2</sub>M(SO<sub>4</sub>)<sub>2</sub> (M = Fe, Co, Mn)
and Li<sub>1</sub>Fe(SO<sub>4</sub>)<sub>2</sub>, which all order
antiferromagnetically at low temperature. From neutron powder diffraction,
we propose a model for their ground-state magnetic structures. The
magnetism of marinite Li<sub>2</sub>M(SO<sub>4</sub>)<sub>2</sub> compounds
unambiguously results from super-super-exchange interactions; therefore,
these materials can be considered as a model case for which the Goodenough–Kanamori–Anderson
rules can be tested
