期刊
ADVANCED MATERIALS
卷 24, 期 31, 页码 4301-+出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201200750
关键词
polyoxometalates; molecular nanomagnets; gadolinium; magnetic refrigeration; magnetocaloric effect; ultra-low temperatures
类别
资金
- European Union
- Spanish MINECO [CSD2007-00010, MAT2007-61584, MAT2009-13977, MAT2011-22785]
- Gobierno de Aragon (MolChip)
- Generalidad Valenciana (Prometeo Program)
The polyoxometalate clusters with formula [Gd(W5O18)(2)](9-) and [Gd(P5W30O110)](12-) each carry a single magnetic ion of gadolinium, which is the most widespread element among magnetic refrigerant materials. In an adiabatic demagnetization, the lowest attainable temperature is limited by the presence of magnetic interactions that bring about magnetic order below a critical temperature. We demonstrate that this limitation can be overcome by chemically engineering the molecules in such a way to effectively screen all magnetic interactions, suggesting their use as ultra-low-temperature coolers.
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