Abstract
The new compounds, AgMnVO 4 and RbMnVO 4 have been synthesized by solid state reaction route. Their crystal structures were determined from single-crystal X-ray diffraction data for RbMnVO 4 and powder X-ray diffraction data for AgMnVO 4. AgMnVO 4 crystallizes with the maricite-type structure in space group Pnma, a=9.5778(6) Å, b=6.8518(4) Å, c=5.3734(3) Å and Z=4. RbMnVO 4 crystallizes in space group P6 3 with a stuffed tridymite-type structure, a=11.2584(3), c=8.9893(13) Å and Z=8. A merohedral twinning was taken into account for its structural refinement. To our knowledge this is the first vanadate showing this structural type. AgMnVO 4 and RbMnVO 4 were characterized by magnetic susceptibility and specific heat measurements. AgMnVO 4 is antiferromagnetic with a Néel temperature of 12.3 K determined by specific heat measurements. RbMnVO 4 exhibits canted antiferromagnetism with a Néel temperature of 6.5 K.
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