Magnetic and elastic properties of (CH3NH3)2FeCl4 and (C2H5NH3)2FeCl4

Nakajima, Tetsuo; Yamauchi, Hiroshi; Gotô, Terutaka; Yoshizawa, Michito; Suzuki, Takashi; Fujimura, Tadao

doi:10.1016/0304-8853(83)90857-0

Cited by 34 publications

(17 citation statements)

References 4 publications

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“…This feature, along with a large transition volume change, suggests that these compounds could be very suitable as barocaloric agents, as plastic crystals have already shown. Compounds with M = Mn, Fe (and other very similar compounds), awakened further interest due to their low-dimensional magnetic properties [11][12][13][14] whereas other layered HOIPs are being investigated for photoluminescence properties. [15][16][17] As in plastic crystals, the huge latent heat originates in the dynamic structural disorder released across the transition.…”

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confidence: 99%

Colossal Reversible Barocaloric Effects in Layered Hybrid Perovskite (C₁₀H₂₁NH₃)₂MnCl₄ under Low Pressure Near Room Temperature

Dunstan

Dixey

et al. 2021

Adv Funct Materials

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Barocaloric effects in a layered hybrid organic-inorganic compound, (C 10 H 21 NH 3 ) 2 MnCl 4 , that are reversible and colossal under pressure changes below 0.1 GPa are reported. This barocaloric performance originates in a phase transition characterized by different features: A strong disordering of the organic chains, a very large volume change, a very large sensitivity of the transition temperature to pressure and a small hysteresis. The obtained values are unprecedented among solid-state cooling materials at such low pressure changes and demonstrate that colossal effects can be obtained in compounds other than plastic crystals. The temperature-pressure phase diagram displays a triple point indicating enantiotropy at high pressure.

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confidence: 99%

Colossal Reversible Barocaloric Effects in Layered Hybrid Perovskite (C₁₀H₂₁NH₃)₂MnCl₄ under Low Pressure Near Room Temperature

Dunstan

Dixey

et al. 2021

Adv Funct Materials

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“…Theo rganic-inorganic layered perovskite-like (C 2 H 5 NH 3 ) 2 Fe II Cl 4 is am ultiferroic exhibiting canted antiferromagnetism and ferroelasticity. [14][15][16][17] Therefore,i ti sp ossible that magnetic properties can be controlled by mechanical stress if the coupling of these ferroic orders exists. However,s trong coupling of physical properties have not been reported for this compound because it is difficult to apply mechanical stress to the crystals since they are strongly deliquescent and unstable in air.T oo vercome these difficulties we synthesized am ore stable organic-inorganic perovskite-like compound to search for the coupling of ferroelasticity and canted antiferromagnetism by replacing the organic cation in (C 2 H 5 NH 3 ) 2 Fe II Cl 4 by the more hydrophobic 2phenylethyl ammonium cation, (C 6 H 5 C 2 H 4 NH 3 ) + ,a bbreviated here as PEA.…”

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confidence: 99%

Coupling of Magnetic and Elastic Domains in the Organic–Inorganic Layered Perovskite‐Like (C₆H₅C₂H₄NH₃)₂Fe^IICl₄ Crystal

et al. 2017

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Multiferroic materials coupling ferroelasticity and ferromagnetism show strong magnetoelastic effects as magnetization is induced by mechanical stress or alternately strain induced by applying a magnetic field. These effects were reported for inorganic multiferroics such as LaCo Sr O . (C H C H NH ) Fe Cl is the first example of an organic-inorganic perovskite to exhibit such effects below the canted antiferromagnetism at T =98 K and ferroelasticity at T =433 K. This is shown by switching the magnetic hysteresis on and off by uniaxial pressure through the strong coupling of the magnetic and elastic domains. The spin-canting direction was controlled by mechanical stress in the heating and cooling cycles. This unique observation gives additional impetus in the search for coupled hysteretic effect in organic-inorganic multiferroics.

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“…In order to select suitable bulky spacers for high‐performance solar cells, we started by comparing four different ammoniums: ethyl ammonium (EA), butyl ammonium (BA), phenylethyl ammonium (PEA), and 5‐ammonium valeric acid (5AVA) presenting a larger and larger cation size ( Figure 1 a). The ionic sizes of all the four cations are too large to fit in the tolerance factor below 1, thus, in principle, they form 2D or 1D perovskite structure when they occupy the A site (Figure b) . We added these large cations into 3D‐forming perovskite solution, composed of FA and Cs (FA 0.85 Cs 0.15 PbX 3 with X = I 0.9 Br 0.1 ), and then we grew the polycrystalline thin film by using a conventional solvent‐quench method.…”

Section: Resultsmentioning

confidence: 99%

Engineering Multiphase Metal Halide Perovskites Thin Films for Stable and Efficient Solar Cells

Kim

Figueroa-Tapia

Prato

et al. 2020

Advanced Energy Materials

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The intrinsic instability of lead halide perovskite semiconductors in an ambient atmosphere is one of the most critical issues that impedes perovskite solar cell commercialization. To overcome it, the use of bulky organic spacers has emerged as a promising solution. The resulting perovskite thin films present complex morphologies, difficult to predict, which can directly affect the device efficiency. Here, by combining in‐depth morphological and spectroscopic characterization, it is shown that both the ionic size and the relative concentration of the organic cation, drive the integration of bulky organic cations into the crystal unit cell and the thin film, inducing different perovskite phases and different vertical distribution, then causing a significant change in the final thin film morphology. Based on these studies, a fine‐engineered perovskite is constructed by employing two different large cations, namely, ethyl ammonium and butyl ammonium. The first one takes part in the 3D perovskite phase formation, the second one works as a surface modifier by forming a passivating layer on top of the thin film. Together they lead to improved photovoltaic performance and device stability when tested in air under continuous illumination. These findings propose a general approach to achieve reliability in perovskite‐based optoelectronic devices.

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Magnetic and elastic properties of (CH3NH3)2FeCl4 and (C2H5NH3)2FeCl4

Cited by 34 publications

References 4 publications

Colossal Reversible Barocaloric Effects in Layered Hybrid Perovskite (C₁₀H₂₁NH₃)₂MnCl₄ under Low Pressure Near Room Temperature

Colossal Reversible Barocaloric Effects in Layered Hybrid Perovskite (C₁₀H₂₁NH₃)₂MnCl₄ under Low Pressure Near Room Temperature

Coupling of Magnetic and Elastic Domains in the Organic–Inorganic Layered Perovskite‐Like (C₆H₅C₂H₄NH₃)₂Fe^IICl₄ Crystal

Engineering Multiphase Metal Halide Perovskites Thin Films for Stable and Efficient Solar Cells

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Magnetic and elastic properties of (CH3NH3)2FeCl4 and (C2H5NH3)2FeCl4

Cited by 34 publications

References 4 publications

Colossal Reversible Barocaloric Effects in Layered Hybrid Perovskite (C10H21NH3)2MnCl4 under Low Pressure Near Room Temperature

Colossal Reversible Barocaloric Effects in Layered Hybrid Perovskite (C10H21NH3)2MnCl4 under Low Pressure Near Room Temperature

Coupling of Magnetic and Elastic Domains in the Organic–Inorganic Layered Perovskite‐Like (C6H5C2H4NH3)2FeIICl4 Crystal

Engineering Multiphase Metal Halide Perovskites Thin Films for Stable and Efficient Solar Cells

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Colossal Reversible Barocaloric Effects in Layered Hybrid Perovskite (C₁₀H₂₁NH₃)₂MnCl₄ under Low Pressure Near Room Temperature

Colossal Reversible Barocaloric Effects in Layered Hybrid Perovskite (C₁₀H₂₁NH₃)₂MnCl₄ under Low Pressure Near Room Temperature

Coupling of Magnetic and Elastic Domains in the Organic–Inorganic Layered Perovskite‐Like (C₆H₅C₂H₄NH₃)₂Fe^IICl₄ Crystal