Hanna L. B. Boström

The interest in spin crossover for solid-state cooling is growing. We investigate the spin crossover transitions of [Fe(pyridine)2Fe(CN)5NO] and [Fe(pyrazine)Fe(CN)5NO] by single-crystal X-ray diffraction, high-pressure X-ray diffraction, magnetometry, and high-pressure calorimetry. The dehydrated form of the latter compound shows a reversible cooling effect (∆Tad,rev) of ∼15K at 1.2 kbar. This is high in the context of other reported spin-crossover barocalorics, and competitive within the field at large. The excellent performance results from a large barocaloric coefficient (dT1/2/dp = 35K kbar−1). In addition, the one-pot synthesis is simple and free from toxic solvents.

The interest in spin crossover for solid-state cooling is growing. We investigate the spin crossover transitions of [Fe(pyridine)2Fe(CN)5NO] and [Fe(pyrazine)Fe(CN)5NO] by single-crystal X-ray diffraction, high-pressure X-ray diffraction, magnetometry, and high-pressure calorimetry. The dehydrated form of the latter compound shows a reversible cooling effect (∆Tad,rev) of ∼15K at 1.2 kbar. This is high in the context of other reported spin-crossover barocalorics, and competitive within the field at large. The excellent performance results from a large barocaloric coefficient (dT1/2/dp = 35K kbar−1). In addition, the one-pot synthesis is simple and free from toxic solvents.

We investigate the pressure-induced structural deformations in a series of rutile-like network materials, M(dca) ₂ (M = Mn, Fe, Ni), using synchrotron high-pressure powder X-ray diffraction (HP-PXRD).

The interest in spin crossover for solid-state cooling is growing. We investigate the spin crossover transitions of [Fe(pyridine)2Fe(CN)5NO] and [Fe(pyrazine)Fe(CN)5NO] by single-crystal X-ray diffraction, high-pressure X-ray diffraction, magnetometry, and high-pressure calorimetry. The dehydrated form of the latter compound shows a reversible cooling effect (∆Tad,rev) of ∼15K at 1.2 kbar. This is high in the context of other reported spin-crossover barocalorics, and competitive within the field at large. The excellent performance results from a large barocaloric coefficient (dT1/2/dp = 35K kbar−1). In addition, the one-pot synthesis is simple and free from toxic solvents.

The stoichiometry of Prussian blue analogues synthesised by ball milling is determined by the hydration of the starting materials and the milling frequency.

Single v s . double networks: Cu(dca) ₂ shows NLC = −6.5 TPa ^{− 1} via flexible dca ⁻ then transitions to monoclinic at 1.11 GPa; Cu(tcm) ₂ exhibits ZLC through rigid tcm ⁻ maintaining structure to 3.75 GPa.

The metal--cyanide frameworks known as Prussian blue analogues display a suite of diverse and tuneable properties. In particular, they are often highly susceptible to modification by external stimuli, such as...

The spin crossover properties of Hofmann complexes are related to their composition and crystal structures.

We report the magnetic behavior of the hybrid perovskites [Gua]Mn1-xFe2x/3 square(x/3)(HCOO)(3) (0 <= x <= 0.88), showing that vacancy ordering drives bulk ferrimagnetism for x > 0.6. The behavior is rationalized in terms of a simple microscopic model of percolation-induced ferrimagnetism. Monte Carlo simulations driven by this model reproduce the experimental dependence of magnetic susceptibility on x and show that, at intermediate compositions, domains of short-range vacancy order lead to the emergence of local magnetization. Our results open up a new avenue for the design of multiferroic hybrid perovskites.

We report the magnetic behaviour of the hybrid perovskites [Gua]Mn1–xFe2x/3(HCOO)3 (0 <x 0.6. The behaviour is rationalised in terms of a simple microscopic model of percolation-induced ferrimagnetism. Monte Carlo simulations driven by this model reproduce the experimental dependence of magnetic susceptibility on x and show that, at intermediate compositions, domains of short-range vacancy order lead to the emergence of local magnetisation. Our results open up a new avenue for the design of multiferroic hybrid perovskites.