ChemInform Abstract: Thermoelectric and Magnetic Measurements on Polycrystalline and Single-Crystal Co1-xTe.

1986 ◽  
Vol 17 (35) ◽  
Author(s):  
H. SCHICKETANZ ◽  
P. TERZIEFF ◽  
K. L. KOMAREK
Keyword(s):  
Single Crystal ◽  
Magnetic Measurements

scholarly journals Darstellung und Kristallstruktur der Verbindungen MnCuX (X = P, As, PxAs1-x) / Preparation and Crystal Structure of Compounds MnCuX (X = P, As, PxAs1-x)

1992 ◽  
Vol 47 (7) ◽  
pp. 925-928 ◽  
Author(s):  
Joachim Mündelein ◽  
Hans-Uwe Schuster
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Magnetic Measurements ◽  
Crystal Data ◽  
Melting Points ◽  
Space Group ◽  
X Ray ◽  
Ternary Compounds ◽  
Antiferromagnetic Ordering

Three new ternary compounds MnCuP, MnCuP0.5As0.5 and MnCuAs have been prepared and characterized by X-Ray, DTA and magnetic measurements. They crystallize orthorhombically in the space group P nma (No. 62). The structures were calculated from single crystal data. The melting points were determined by DTA measurements (MnCuP: 1090°C; MnCuP0.5As0.5: 1000 °C; MnCuAs: 950 °C). MnCuAs appears to show an antiferromagnetic ordering up to 295 K.

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.

Two series of rare earth metal-rich ternary aluminium transition metallides – RE6Co2Al (RE=Sc, Y, Nd, Sm, Gd–Tm, Lu) and RE6Ni2.25Al0.75 (RE=Y, Gd–Tm, Lu)

2018 ◽  
Vol 73 (11) ◽  
pp. 927-942 ◽  
Author(s):  
Frank Stegemann ◽  
Oliver Janka
Keyword(s):  
Rare Earth ◽  
Single Crystal ◽  
Rare Earth Metal ◽  
Magnetic Measurements ◽  
Earth Metal ◽  
Nominal Composition ◽  
X Ray Diffraction ◽  
X Ray ◽  
Antiferromagnetic Ordering ◽  
Arc Melting

AbstractThe rare earth metal-rich cobalt and nickel aluminium compounds with the general compositions RE6Co2Al (RE=Sc, Y, Nd, Sm, Gd–Tm, Lu) and RE6Ni2.25Al0.75 (RE=Y, Gd–Tm, Lu) have been synthesised from the elements by arc-melting, followed by annealing. Single-crystal X-ray diffraction experiments on Y6Co2.02(1)Al0.98(1) (Ho6Co2Ga type; Immm; a=944.1(2), b=952.4(2), c=999.0(2) pm; wR2=0.0452, 1123 F2 values, 35 variables) and Y6Ni2.26(1)Al0.74(1) (Ho6Co2Ga type; Immm; a=938.30(5), b=959.45(5), c=996.05(6) pm; wR2=0.0499, 1131 F2 values, 35 variables) revealed that the compounds form solid solutions according to the general formula RE6(Co/Ni)2+xAl1−x with different homogeneity ranges. The compounds of the Ni series can be obtained in X-ray pure form only with the nominal composition RE6Ni2.25Al0.75. A significant increase of the U22 component of the anisotropic displacement parameters of the Co/Ni2 atoms (4g site) was observed that requires a description of the structure with a split-position model at RT. Further investigations by low temperature (90 K) single-crystal X-ray diffraction experiments of Y6Co2.02(1)Al0.98(1) showed a significant decrease of U22. Magnetic measurements were conducted on the X-ray pure members of the RE6Co2Al (RE=Y, Dy–Tm, Lu) series. Antiferromagnetic ordering was observed for the members with unpaired f electrons with Néel temperatures up to TN=48.0(1) K and two spin reorientations for Dy6Co2Al.

Preparation and magnetic measurements of single crystal Tl 2 Ba 2 CaCu 2 O 8

1991 ◽  
Vol 109 (1-4) ◽  
pp. 436-440 ◽  
Author(s):  
J.Z. Liu ◽  
Y.X. Jia ◽  
P. Klavins ◽  
R.N. Shelton ◽  
J. Downey ◽  
...  
Keyword(s):  
Single Crystal ◽  
Magnetic Measurements

Thickness Effect on Thermal Stability by Phase Transition of Single Crystal Hematite Nanorings

NANO ◽  
2015 ◽  
Vol 10 (06) ◽  
pp. 1550084
Author(s):  
Le Li ◽  
Fagen Li ◽  
XiaoPing Zhang ◽  
Jun Wang
Keyword(s):  
Electron Microscopy ◽  
Phase Transition ◽  
Thermal Stability ◽  
Single Crystal ◽  
Magnetic Measurements ◽  
Magnetic Measurement ◽  
High Vacuum ◽  
Finite Size ◽  
Thickness Effect ◽  
Temperature Phase

Single-crystal hematite (α- Fe 2 O 3) nanorings with three different thicknesses were synthesized by a hydrothermal method. The results of X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM) show that the nanorings are single-crystal and have relatively uniform outer diameters of 160nm, and heights of about 100nm. Magnetic measurements up to 920K have been performed on hydrothermally synthesized α- Fe 2 O 3 nanorings and nanoparticles using a quantum design vibrating sample magnetometer. A high temperature phase transition of thermal stability (α- Fe 2 O 3 to Fe 3 O 4) occurs when magnetic measurement was performed under high vacuum (< 9.5 × 10-5 Torr). The phase transition temperature is 670K for nanorings with thickness of ∼30nm, 718K for nanorings with thickness of ∼50nm, 678K for nanorings with thickness of ∼65nm, and 640K for ∼35nm nanoparticles. This data show better thermal stability of nanorings with the thickness of ∼50nm than the other two kinds of nanoring samples The Néel temperature (T N ) of α- Fe 2 O 3 nanorings with the thickness of ∼50nm is determined to be 937.2K by magnetic measurement for the first time, about 22.8K below the bulk value. The small reduction of the T N of the α- Fe 2 O 3 nanorings is consistent with the finite-size scaling theory.

scholarly journals Functionalized phosphonates as building units for multi-dimensional homo- and heterometallic 3d–4f inorganic–organic hybrid-materials

2016 ◽  
Vol 45 (32) ◽  
pp. 12854-12861 ◽  
Author(s):  
C. Köhler ◽  
E. Rentschler
Keyword(s):  
Single Crystal ◽  
Hybrid Materials ◽  
Magnetic Measurements ◽  
Diphosphonic Acid ◽  
Single Crystal Diffraction ◽  
Organic Hybrid ◽  
New Family ◽  
Multifunctional Ligand

Using the multifunctional ligand H4L (2,2′-bipyridinyl-5,5′-diphosphonic acid), a new family of 0D-3D inorganic–organic hybrid-materials was prepared and characterized by single crystal diffraction and magnetic measurements.

Spin reorientation in the Er2−xFe14+2xSi3 single crystal studied by the Fe57 Mössbauer spectroscopy and magnetic measurements

2008 ◽  
Vol 103 (12) ◽  
pp. 123910 ◽  
Author(s):  
J. Żukrowski ◽  
A. Błachowski ◽  
K. Ruebenbauer ◽  
J. Przewoźnik ◽  
D. Sitko ◽  
...  
Keyword(s):  
Mössbauer Spectroscopy ◽  
Single Crystal ◽  
Mossbauer Spectroscopy ◽  
Magnetic Measurements ◽  
Spin Reorientation ◽  
Mößbauer Spectroscopy
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