Crystal and magnetic structures of polar Co2ScSbO6 oxides

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Polar A2BSbO6 oxides with the Ni3TeO6 structure type (space group R3) are being investigated as possible ferroelectrics. Ni2ScSbO6 is reported to have incommensurate helical spin ordering with wavevector k = (0, 0.036, 0) below 60 K. We have prepared a new analogue Co2ScSbO6. Preliminary WISH data from a large sample made at ambient pressure, which contains ~35% Co2.5Sc0.5O4 impurity, show that Co2ScSbO6 has a long range ordering transition near 60 K, with a complex incommensurate...
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