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Gattermann, Ulf; Park, Sohyun; Paulmann, Carsten; Benka, Georg; Pfleiderer, Christian (30. September 2016): HT-solution growth and characterisation of InxNaxMn1-2xWO4 (0 < x ≤ 0.26). In: Journal of Solid State Chemistry, Vol. 244: pp. 140-150
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Abstract

A new solid solution system, InxNaxMn1-2xWO4 (0 < x ≤ 0.26) belonging to the MnWO4-type multiferroics was investigated. Large single crystals were grown up to several mm in length from high-temperature oxide solutions using a solvent mixture of Na2WO4 and Na2W2O7. Quantitative doping degrees were analyzed by means of electron microprobe. Single crystal X-ray diffraction studies agreed with the polar space group P2 for InxNaxMn1-2xWO4. The complexity of partial (Na+/Mn2+)- and (In3+/Mn2+)-ordering makes their atomic sites unique, explaining the dissymmetrization from P2/c down to P2. This is also valid for the InNaW2O8-type Mn2yIn1-yNa1-yW2O8 solid solution found as co-product in this study. Specific heat and magnetisation measurements showed a paramagnetic dilution effect from (In3+/Na+)-doping while lowering the transition temperature for the multiferroic phase AF2 of InxNaxMn1-2xWO4 with respect to the prototype MnWO4.