13601-11-1Relevant articles and documents
Swift and efficient nuclear spin conversion of molecular hydrogen confined in Prussian blue analogs
Hori, Akihiro,Matsuda, Ryotaro,Mishima, Akio,Ohba, Masaaki,Ohtani, Ryo,Ohtsubo, Yuta
, p. 149 - 152 (2020)
The ortho-isomer of molecular hydrogen (o-H2) was converted to the para-isomer (p-H2) within 600 s by using Prussian blue analogs, {MII 3[CrIII(CN)6]2} (MCr; M = Mn and Ni), as nuclear-spin conversion catalysts. The swift conversion was confirmed by in-situ Raman micro-spectroscopy under an H2 gas atmosphere (100 kPa) in a low temperature range (2090 K). The o-p ratio observed in MCr deviated from the theoretical value based on the Boltzmann distribution of H2 in a free rotational state to the para-rich proportion, which suggested the promotion of the o-p conversion at higher temperature.
Photoinduced magnetism in core/shell prussian blue analogue heterostructures of KjNik[Cr(CN)6] l· n H2O with RbaCob[Fe(CN) 6]c· mH2O
Dumont, Matthieu F.,Knowles, Elisabeth S.,Guiet, Amandine,Pajerowski, Daniel M.,Gomez, Ariel,Kycia, Stefan W.,Meisel, Mark W.,Talham, Daniel R.
, p. 4295 - 4300 (2011)
Core/shell and core/shell/shell particles comprised of the Prussian blue analogues KjNik[Cr(CN)6]l· nH2O (A) and RbaCob[Fe(CN)6] c·mH2O (B) have been prepared for the purpose of studying persistent photoinduced magnetization in the heterostructures. Synthetic procedures have been refined to allow controlled growth of relatively thick (50-100 nm) consecutive layers of the Prussian blue analogues while minimizing the mixing of materials at the interfaces. Through changes in the order in which the two components are added, particles with AB, ABA, BA, and BAB sequences have been prepared. The two Prussian blue analogues were chosen because B is photoswitchable, and A is ferromagnetic with a relatively high magnetic ordering temperature, ～70 K, although it is not known to exhibit photoinduced changes in its magnetic properties. Magnetization measurements on the heterostructured particles performed prior to irradiation show behavior characteristic of the individual components. On the other hand, after irradiation with visible light, the heterostructures undergo persistent photoinduced changes in magnetization associated with both the B and A analogues. The results suggest that structural changes in the photoactive B component distort the normally photoinactive A component, leading to a change in its magnetization.
Dodsworth, Elaine S.,Eaton, Janice P.,Ellerby, Michael P.,Nicholls, David
, p. 143 - 146 (1984)
Anisotropic magnetism in Prussian blue analogue films
Pajerowski, Daniel M.,Gardner, Justin E.,Talham, Daniel R.,Meisel, Mark W.
, p. 1320 - 1326 (2011)
A series of Prussian blue analogue (PBA) thin films with thicknesses ranging from 25 nm to 2 μm and with the chemical formula Rb jM1k[M2(CN)6]l·nH 2O have been synthesized using sequential adsorption techniques (where M1 = Co2+, Ni2+, Cu2+, or Zn 2+and M2 = Cr3+ or Fe3+). Since the resulting materials possess the PBA structure, changing the metal ions effectively tunes the magnetization density because SCo = 3/2, SNi = 1, SCu = 1/2, and SZn = 0 on the divalent metal sites and SCr = 3/2 and SFe = 1/2 on the trivalent metal sites. The effect of changing metal ions on the magnetic susceptibility, and specifically the difference between parallel and perpendicular orientations of the films with respect to the applied magnetic field, was investigated with SQUID magnetometry, and all samples, except the ZnFe PBA films, showed magnetic anisotropy. The films were also characterized with infrared spectroscopy, energy dispersive X-ray spectroscopy, atomic force microscopy, and scanning electron microscopy.
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Hume,Stone
, p. 1200,1201 (1941)
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Effect of pressure on the magnetic properties of LiCuFe and LiCuFe@LiNiCr Prussian blue analogues
Peprah, Marcus K.,Li, Carissa H.,Talham, Daniel R.,Meisel, Mark W.
, p. 264 - 267 (2013)
Magnetic studies on the Prussian blue analogues (PBAs) Li xCuy[Fe(CN)6]z·mH 2O (LiCuFe-PBA) and LijNik[Cr(CN) 6]l·nH2O (LiNiCr-PBA), as well as LiCuFe@LiNiCr-PBA core-shell heterostructures, have been conducted under pressures ranging from ambient to ≈1.4 GPa and at temperatures of 2-90 K. The results for the single component CuFe-PBA indicate robust magnetic properties under the range of pressures studied where a Tc = 20 K was observed at all pressures. Our pressure studies of single component NiCr-PBA are consistent with previously published results by other workers below 1.0 GPa. However, at pressures above 1.0 GPa, the decrease in magnetization is accompanied by a decrease in the Tc, an indication of changes in the superexchange value. The results obtained with the single component samples can be mapped onto the observations of the heterostructures.
