Three mixed-valence iron-formate frameworks exhibit spontaneous strain of 0.16, indicating significant ferroelastic behavior and exchange bias.
Three isotopological (stb) mixed-valence iron-formate frameworks, [A][FeIII(FeII)2(HCOO)9] (1-3), were constructed and exhibit ferroelastic phase transition with spontaneous strain of 0.16. 1-3 are spin-canted antiferromagnets with distinct TN from 26 K to 36 K and display exchange bias (EB) performance induced by the pinning of the spins at distinct sublattices.
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Yan et al. (2025) studied this question.
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