Fragmenting gadolinium: mononuclear polyoxometalate-based magnetic coolers for ultra-low temperatures.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 22718245.
- Also identified by DOI 10.1002/adma.201200750.
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Abstract
The polyoxometalate clusters with formula [Gd(W(5) O(18) )(2) ](9-) and [Gd(P(5) W(30) O(110) )](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.
Medical subject headings
- Gadolinium
- Magnetics
- Tungsten Compounds