scholarly journals Reversible redox switching of magnetic order and electrical conductivity in a 2D manganese benzoquinoid framework

2020 ◽  
Author(s):  
Lujia Liu
Keyword(s):  
Electrical Conductivity ◽  
Electrical Properties ◽  
Single Crystal ◽  
Magnetic Order ◽  
Magnetic Measurements ◽  
Fold Increase ◽  
Parent Material ◽  
Formidable Challenge ◽  
Redox Switching ◽  
Magnetic And Electrical Properties

© 2019 The Royal Society of Chemistry. Materials with switchable magnetic and electrical properties may enable future spintronic technologies, and thus hold the potential to revolutionize how information is processed and stored. While reversible switching of magnetic order or electrical conductivity has been independently realized in materials, the ability to simultaneously switch both properties in a single material presents a formidable challenge. Here, we report the 2D manganese benzoquinoid framework (Me4N)2[MnII2(L2-)3] (H2L = 2,5-dichloro-3,6-dihydroxo-1,4-benzoquinone), as synthesized via post-synthetic counterion exchange. This material is paramagnetic above 1.8 K and exhibits an ambient-temperature electrical conductivity of σ295 K = 1.14(3) × 10-13 S cm-1 (Ea = 0.74(3) eV). Upon soaking in a solution of sodium naphthalenide and 1,2-dihydroacenaphthylene, this compound undergoes a single-crystal-to-single-crystal (SC-SC) reduction to give Na3(Me4N)2[Mn2L3]. Structural and spectroscopic analyses confirm this reduction to be ligand-based, and as such the anionic framework is formulated as [MnII2(L3-)3]5-. Magnetic measurements confirm that this reduced material is a permanent magnet below Tc = 41 K and exhibits a conductivity value of σ295 K = 2.27(1) × 10-8 S cm-1 (Ea = 0.489(8) eV), representing a remarkable 200 000-fold increase over the parent material. Finally, soaking the reduced compound in a solution of [Cp2Fe]+ affords Na(Me4N)[MnII2(L2-)3] via a SC-SC process, with magnetic and electrical properties similar to those observed for the original oxidized material. Taken together, these results highlight the ability of metal benzoquinoid frameworks to undergo reversible, simultaneous redox switching of magnetic order and electrical conductivity.

scholarly journals Reversible redox switching of magnetic order and electrical conductivity in a 2D manganese benzoquinoid framework

2020 ◽  
Author(s):  
Lujia Liu
Keyword(s):  
Electrical Conductivity ◽  
Electrical Properties ◽  
Single Crystal ◽  
Magnetic Order ◽  
Magnetic Measurements ◽  
Fold Increase ◽  
Parent Material ◽  
Formidable Challenge ◽  
Redox Switching ◽  
Magnetic And Electrical Properties

© 2019 The Royal Society of Chemistry. Materials with switchable magnetic and electrical properties may enable future spintronic technologies, and thus hold the potential to revolutionize how information is processed and stored. While reversible switching of magnetic order or electrical conductivity has been independently realized in materials, the ability to simultaneously switch both properties in a single material presents a formidable challenge. Here, we report the 2D manganese benzoquinoid framework (Me4N)2[MnII2(L2-)3] (H2L = 2,5-dichloro-3,6-dihydroxo-1,4-benzoquinone), as synthesized via post-synthetic counterion exchange. This material is paramagnetic above 1.8 K and exhibits an ambient-temperature electrical conductivity of σ295 K = 1.14(3) × 10-13 S cm-1 (Ea = 0.74(3) eV). Upon soaking in a solution of sodium naphthalenide and 1,2-dihydroacenaphthylene, this compound undergoes a single-crystal-to-single-crystal (SC-SC) reduction to give Na3(Me4N)2[Mn2L3]. Structural and spectroscopic analyses confirm this reduction to be ligand-based, and as such the anionic framework is formulated as [MnII2(L3-)3]5-. Magnetic measurements confirm that this reduced material is a permanent magnet below Tc = 41 K and exhibits a conductivity value of σ295 K = 2.27(1) × 10-8 S cm-1 (Ea = 0.489(8) eV), representing a remarkable 200 000-fold increase over the parent material. Finally, soaking the reduced compound in a solution of [Cp2Fe]+ affords Na(Me4N)[MnII2(L2-)3] via a SC-SC process, with magnetic and electrical properties similar to those observed for the original oxidized material. Taken together, these results highlight the ability of metal benzoquinoid frameworks to undergo reversible, simultaneous redox switching of magnetic order and electrical conductivity.

Magnetic and electrical properties of single-crystal La2−xSrxCu1−yNiyO4

2003 ◽  
Vol 388-389 ◽  
pp. 241-242 ◽  
Author(s):  
Nobuaki Watanabe ◽  
Takahiko Masui ◽  
Yutaka Itoh ◽  
Takato Machi ◽  
Isao Kato ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Single Crystal ◽  
Magnetic And Electrical Properties

THE ELECTRICAL PROPERTIES OF ALUMINA AT HIGH TEMPERATURES

1966 ◽  
Vol 44 (8) ◽  
pp. 1685-1698 ◽  
Author(s):  
T. Matsumura
Keyword(s):  
Electrical Conductivity ◽  
Electrical Properties ◽  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Single Crystal ◽  
Transport Number ◽  
Ionic Transport ◽  
Mixed Conductor ◽  
Polycrystalline Alumina ◽  
Ionic Transport Number

The ionic transport number and the d-c. electrical conductivity of single-crystal and polycrystalline alumina have been studied between 1 000 °K and 1 750 °K at an oxygen partial pressure of 0.2 atm. The ionic transport number was determined by the galvanic-cell e.m.f. measurements; the electrical conductivity was measured by the three-terminal method.It was found that alumina is a mixed conductor, being predominantly an ionic conductor at temperatures below 1 100 °K and predominantly electronic at temperatures higher than 1 600 °K. The activation energies found for the electrical conductivity of the single-crystal and polycrystalline specimens are 0.8 eV and 2.4 eV respectively in the ionic range and 3.0 eV and 3.7 eV in the electronic range.

Magnetic and Electrical Properties of Iron-Based Soft Magnetic Composites with Silicone Resin Insulation Coating

2016 ◽  
Vol 723 ◽  
pp. 80-88
Author(s):  
Fa Chang Li ◽  
Yi Li ◽  
Xue Quan Liu ◽  
Jin Pu Li ◽  
Nan Li ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Electrical Properties ◽  
Magnetic Measurements ◽  
Magnetic Loss ◽  
Silicone Resin ◽  
Soft Magnetic ◽  
Magnetic Composites ◽  
Distribution Maps ◽  
Soft Magnetic Composites ◽  
Magnetic And Electrical Properties

This paper investigates the magnetic and electrical properties of iron silicone resin soft magnetic composites. Scanning electron microscopy, energy dispersive X-ray spectroscopy analysis, distribution maps and density measurements confirm that the particles surface layer contains a thin layer of silicone resin with complete coverage of powders surface. The thickness of silicone resin film is averagely 120nm according to the results of transmission electron microscopy. Magnetic measurements show that the silicone resin insulation has a greater heat resistance than the conventional phosphate insulation, which enables stress reliving during annealing at higher temperature (600°C) without a large increase in magnetic loss. The results of annealing at 600°C show that the electrical resistivity increased from 8μΩ·m for SOMALOYTM samples to 55μΩ·m for the silicone insulated composites produced in this work.

scholarly journals Reversible redox switching of magnetic order and electrical conductivity in a 2D manganese benzoquinoid framework

2019 ◽  
Vol 10 (17) ◽  
pp. 4652-4661 ◽  
Author(s):  
Lujia Liu ◽  
Jordan A. DeGayner ◽  
Lei Sun ◽  
David Z. Zee ◽  
T. David Harris
Keyword(s):  
Electrical Conductivity ◽  
Magnetic Order ◽  
Reversible Redox ◽  
Redox Switching

We report a 2D manganese benzoquinoid network that undergoes simultaneous redox switching of magnetic order and electrical conductivity.

Magnetic and Electrical Properties of Gd-Lu Single Crystal Alloys

1975 ◽  
Vol 39 (4) ◽  
pp. 873-879 ◽  
Author(s):  
Akio Mishima ◽  
Hironobu Fujii ◽  
Tetsuhiko Okamoto
Keyword(s):  
Electrical Properties ◽  
Single Crystal ◽  
Magnetic And Electrical Properties

scholarly journals Enhanced Thermal and Electrical Properties of Polystyrene-Graphene Nanofibers via Electrospinning

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Yan Li ◽  
Harshit Porwal ◽  
Zhaohui Huang ◽  
Han Zhang ◽  
Emiliano Bilotti ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
Electrical Properties ◽  
Physical Properties ◽  
Morphological Analysis ◽  
Composite Nanofibers ◽  
Fold Increase ◽  
Fiber Formation ◽  
Liquid Exfoliation ◽  
Thermal And Electrical Properties

Polystyrene- (PS-) graphene nanoplatelets (GNP) (0.1, 1, and 10 wt.%) nanofibers were successfully produced via electrospining of dimethyformamide- (DMF-) stabilized GNP and PS solutions. Morphological analysis of the composite nanofibers confirmed uniform fiber formation and good GNP dispersion/distribution within the PS matrix. The good physical properties of GNP produced by liquid exfoliation were transferred to the PS nanofibers. GNP modified PS nanofibers showed a 6-fold increase in the thermal conductivity and an increase of 7-8 orders of magnitude in electrical conductivity of the nanofibers at 10 wt.% GNP loading.

Single Crystal Growth and Magnetic and Electrical Properties of an Antiferromagnet UCr2Si2

2002 ◽  
Vol 39 (sup3) ◽  
pp. 225-228 ◽  
Author(s):  
Tatsuma D. Matsuda ◽  
Yoshinori Haga ◽  
Yoshihumi Tokiwa ◽  
Etsuji Yamamoto ◽  
Shugo Ikeda ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Electrical Properties ◽  
Single Crystal ◽  
Single Crystal Growth ◽  
Magnetic And Electrical Properties
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