Low-temperature magnetocaloric effect of the polyoxovanadate molecular magnet {VIV/V12As8}: An experimental study
Source abstract
Abstract
Magnetic measurements have been performed for the compound (NH(C 2H 5) 3) 4[V IV 8V V 4As III 8 O 40(H 2O)]·H 2O compound in order to determine its magnetocaloric effect in terms of the isothermal entropy change and compare it to the theoretical prediction based on the previously developed model. A closer inspection of the experimental magnetization and susceptibility data revealed that this model is incomplete neglecting a contribution from the off-center V 4 subsystems, where the vanadium ions are in the mixed valence state. The probability that two valence electrons residing within the two off-center V 4 subsystems are magnetically decoupled was estimated to be equal to 2 – 3 %. For most of the time they turn out to be magnetically correlated by the high antiferromagnetic superexchange interaction. The magnetocaloric effect calculated with the full model accounting for the off-center contribution was found to agree satisfactorily with the values derived from the measured magnetization data. A valuable byproduct of the analysis is the rigorous estimation of the errors in the isothermal entropy change due to the necessary numerical approximations.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Polyoxometalates: Synthesis and Applications · Magnetism in coordination complexes · Metal-Organic Frameworks: Synthesis and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (65)
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