Influence of magnetic field on a spin-crossover material

Ribeiro, P. O.; Alho, B.P.; Ribas, R.; Nóbrega, E.P.; Sousa, V.S.R. de

doi:10.1016/j.jmmm.2019.165340

Cited by 14 publications

(5 citation statements)

References 23 publications

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“…In particular, simultaneous application of both magnetic field and pressure were discussed on SCO compounds by some of us. [ 46 ] Our calculations are in good agreement with the experimental data, obtained indirectly for SCO materials. [ 27 ] The maximum ΔS T and ΔT ad values occur around the HS–LS phase transition, which can be tuned with pressure.…”

Section: Discussionsupporting

confidence: 83%

Refrigeration through Barocaloric Effect Using the Spin Crossover Complex {Fe[H₂B(pz)₂]₂(bipy)}

Ranke

Alho

Silva

et al. 2021

Physica Status Solidi (b)

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Spin crossover complexes have a very striking signature of a huge volume change coupled with low–high spin conversion around a critical temperature, which can be pressure tuned in a large temperature interval. Herein, the barocaloric effect is reported in the spin crossover complex {Fe[H2B(pz)2]2(bipy)} (bipy = 2,2′‐bipyridine) from theoretical and applied points of view. The experimental data reveal a giant barocaloric effect, through the isothermal entropy change (ΔST = 83 J kg−1 K−1) around T = 273 K, upon moderated hydrostatic pressure variation (ΔP = 2 kbar). The high and linear behavior in the pressure dependence of the phase transition temperature (19 K kbar−1) leads to a huge relative cooling power (RCP = 7296 J kg−1) upon ΔP = 3 kbar, which is discussed using Ericsson's cooling cycle. Theoretical results, obtained from a microscopic model, updated with the vibration modes from density functional theory (DFT) calculation, show remarkable agreement with the experimental data.

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Section: Discussionsupporting

confidence: 83%

Refrigeration through Barocaloric Effect Using the Spin Crossover Complex {Fe[H₂B(pz)₂]₂(bipy)}

Ranke

Alho

Silva

et al. 2021

Physica Status Solidi (b)

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“…1–5 That transition can be modified or tuned by incorporating a guest species within the material framework. 6,7 SCO has received considerable attention in the last few decades for two reasons: (1) it modifies the physical properties of a solid, which opens up the possibility of its applications as a functional material; 8–16 (2) it involves basic concepts within the coordination chemistry of transition metals, and the effect illustrates how relevant each of them could be. For iron(2+), the SCO involves four electrons, and the observed changes in the physical properties are the most pronounced within the four metal ions where the effect is observed because of this Fe(2+)-containing solids with SCO have attracted attention within the materials with this behavior.…”

Section: Introductionmentioning

confidence: 99%

Spin-crossover in the Fe(4X-pyridine)₂[Fe(CN)₅NO] series with X = Cl, Br, and I. Role of the distortion for the iron atom coordination environment

et al. 2023

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“…The spin-crossover behavior is an interesting spin transition induced by external stimuli, among them, a temperature or pressure change, [1][2][3][4] light incidence, [5,6] applied magnetic [7,8] or electric [9,10] field, and through the introduction of guest species in the material framework. [11,12] The motivation for the study of that induced spin transition is closely related to the resulting variation in the material physical properties, [1][2][3][4] which support their possible applications as displays materials, [3] in sensors and actuators, [13,14] magnetic refrigeration, [15] energy conversion devices, [16] information storage, [3,17,18] etc. Within the 3d metals (M) where the SCO is possible, 3d 4 -3d 7 , the observed changes in the material physical properties are particularly pronounced for compounds containing iron(2 +) ions because the spin transition, between the low spin (LS) and high spin (HS) states, involves four electrons.…”

Section: Introductionmentioning

confidence: 99%

Thermally‐Induced Spin‐Crossover in Fe_1‐xT_x(pyrazine)[Fe(CN)₅NO] with T=Co, Ni – Effects of Iron Atom Dilution

et al. 2021

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2D ferrous nitroprusside with the pyrazine molecule as a pillar between adjacent layers shows a thermally induced spincrossover behavior. This supposes that the energy gap between the high and low spin states is the order of kT in the temperature region where such a spin transition is observed. If a fraction of the iron atoms involved in that transition is progressively replaced by a second metal, to form a solid solution (alloy), the thermal effect could be modified due to the iron atom dilution, but such behavior also depends on the bonding properties of the ligands for the iron atom and of the NO and CN interaction in the interlayer region. This hypothesis was the idea that motivated the preparation of the titled systems of solid solutions and their study from magnetic and Mössbauer data recorded at different temperatures in the range of 5-300 K, complemented with XRD, Raman, and IR measurements. Co and Ni were considered to form the solid solutions under study because they form isostructural solids in the parent 3D coordination polymers. For both metals, the formed solids show a spin-crossover effect for all the compositions range but from a certain degree of dilution for the iron atom, above 75 % substitution by the second metal, the thermal hysteresis almost disappears. This suggests that from that dilution degree, the spin transition involves structural changes at the local coordination environment for the iron atom but not for the entire solid framework. This hypothesis is properly supported by the recorded Raman and Mössbauer spectra. The presence of Co and Ni atoms in the solid solutions results in higher stability for the entropy-driven high spin state. This is appreciated as lower values for T# HS , 1/2 , and T" LS , 1/2 corresponding to the temperatures where the subscript 1/2 indicates the temperature where 50 % of the metal centers have changed their spin state.

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Influence of magnetic field on a spin-crossover material

Cited by 14 publications

References 23 publications

Refrigeration through Barocaloric Effect Using the Spin Crossover Complex {Fe[H₂B(pz)₂]₂(bipy)}

Refrigeration through Barocaloric Effect Using the Spin Crossover Complex {Fe[H₂B(pz)₂]₂(bipy)}

Spin-crossover in the Fe(4X-pyridine)₂[Fe(CN)₅NO] series with X = Cl, Br, and I. Role of the distortion for the iron atom coordination environment

Thermally‐Induced Spin‐Crossover in Fe_1‐xT_x(pyrazine)[Fe(CN)₅NO] with T=Co, Ni – Effects of Iron Atom Dilution

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Influence of magnetic field on a spin-crossover material

Cited by 14 publications

References 23 publications

Refrigeration through Barocaloric Effect Using the Spin Crossover Complex {Fe[H2B(pz)2]2(bipy)}

Refrigeration through Barocaloric Effect Using the Spin Crossover Complex {Fe[H2B(pz)2]2(bipy)}

Spin-crossover in the Fe(4X-pyridine)2[Fe(CN)5NO] series with X = Cl, Br, and I. Role of the distortion for the iron atom coordination environment

Thermally‐Induced Spin‐Crossover in Fe1‐xTx(pyrazine)[Fe(CN)5NO] with T=Co, Ni – Effects of Iron Atom Dilution

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Refrigeration through Barocaloric Effect Using the Spin Crossover Complex {Fe[H₂B(pz)₂]₂(bipy)}

Refrigeration through Barocaloric Effect Using the Spin Crossover Complex {Fe[H₂B(pz)₂]₂(bipy)}

Spin-crossover in the Fe(4X-pyridine)₂[Fe(CN)₅NO] series with X = Cl, Br, and I. Role of the distortion for the iron atom coordination environment

Thermally‐Induced Spin‐Crossover in Fe_1‐xT_x(pyrazine)[Fe(CN)₅NO] with T=Co, Ni – Effects of Iron Atom Dilution