scholarly journals The First Observation of Metallic Behaviour in Nd3.5Sm0.5Ni3O8

2016 ◽  
Vol 2016 ◽  
pp. 1-5 ◽  
Author(s):  
Akitoshi Nakata ◽  
Syunsuke Yano ◽  
Hiroki Yamamoto ◽  
Syunsuke Sakura ◽  
Yoshihide Kimishima ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Valence State ◽  
Weak Localization ◽  
Metallic State ◽  
Apical Oxygen ◽  
Metallic Conduction

In Nd3.5Sm0.5Ni3O8which has basically the same crystal structure and the similar electrical configuration (Ni+3d9/Ni2+3d8mix valence state) with high-Tccuprate, it has been found that this material shows metallic behaviour down to about 20 K by intercalation and subsequent deintercalation with sulfur. This is the first observation of the metallic state in this system. It is unclear why sulfur-intercalation and deintercalation induce the metallic state. We speculate that sulfur works as an effective getter for removing the interstitial apical oxygen which impedes the metallic conduction. However, the weak localization of carriers in the NiO2planes still remains below 20 K and the localization may be one of the obstacles to occurrence of possible superconductivity.

Monoolefincobalt(0)-Komplexe / Monoolefincobalt(0) Complexes

1988 ◽  
Vol 43 (10) ◽  
pp. 1256-1262 ◽  
Author(s):  
Hans-Friedrich Klein ◽  
Goetz Lull ◽  
Birgit Rodenhäuser ◽  
Gerhard Cordier ◽  
Helmut Paulus
Keyword(s):  
Crystal Structure ◽  
Carbon Monoxide ◽  
Valence State ◽  
Cobalt Atom ◽  
Spectroscopic Properties ◽  
X Ray ◽  
Mononuclear Cobalt ◽  
Structure Determinations

Mononuclear cobalt(o) complexes containing olefin and trimethylphosphane ligands Co(olefin)(PMe3)3 (olefin = C2H4 (1), C3H6 (2), cyclopentene (3), trans-1,2-diphenylethene (4), tetrafluorobenzo-bicyclo-(2.2.2)-octadiene (5)), are obtained from CoCl2 by reaction with magnesium in the presence of the ligands or by substitution of 3 with olefin. X-ray crystal structure determinations of 4 and 5 show a distorted tetrahedral arrangement of ligands around the cobalt atom. Chemical and spectroscopic properties are consistent with a paramagnetic valence state of the compounds in solution. By reaction with carbon monoxide a dicobalt complex is formed, while azobenzene gives paramagnetic Co(N2Ph2)(PMe3)2.

Crystal Structure, Magnetic Behavior and Valence State of Ytterbium in the Yb4Ni10+xGa21-x Phase.

ChemInform ◽  
2003 ◽  
Vol 34 (17) ◽  
Author(s):  
L. Vasylechko ◽  
W. Schnelle ◽  
U. Burkhardt ◽  
R. Ramlau ◽  
R. Niewa ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Valence State ◽  
Magnetic Behavior

Diolefincobalt(0)-Komplexe / Diolefincobalt(0) Complexes

1984 ◽  
Vol 39 (5) ◽  
pp. 643-648 ◽  
Author(s):  
Hans-Friedrich Klein ◽  
Joachim Groß ◽  
Hubert Witty ◽  
Dietmar Neugebauer
Keyword(s):  
Crystal Structure ◽  
Structure Determination ◽  
Valence State ◽  
Cobalt Atom ◽  
Spectroscopic Properties ◽  
Dinuclear Complex ◽  
X Ray ◽  
Linear Dimer ◽  
Mononuclear Cobalt

Mononuclear cobalt(0) complexes containing diolefin and trimethylphosphane ligands Co(cycloocta-1,5-diene)(PMe3)2 and Co[(CH2=CHMe2Si)2O](PMe3)2 are obtained from CoCl2 by reaction with magnesium in the presence of the ligands or by substitution of cobalt(olefin)tris- (trimethylphosphane) with diolefin. Chemical and spectroscopic properties confirm the para- magnetic valence state of the compounds in solution. An X-Ray crystal structure determination of Co[(CH2=CHMe2Si)2O](PMe3)2 shows a tetrahedral arrangement of ligand functions around the cobalt atom. With butadiene a diamagnetic dinuclear complex [Co(C4H6)(PMe3)3]2 is obtained containing π-allyl co-ordination of two Co(PMe3)3 units to a linear dimer of butadiene

π–d INTERACTION BASED MOLECULAR CONDUCTING MAGNETS: HOW TO INCREASE THE EFFECTS OF THE π–d INTERACTION

COSMOS ◽  
2008 ◽  
Vol 04 (02) ◽  
pp. 131-140 ◽  
Author(s):  
AKIRA MIYAZAKI ◽  
TOSHIAKI ENOKI
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Transition Temperature ◽  
Phase Boundary ◽  
Ground State ◽  
Magnetic Order ◽  
Molecular Magnets ◽  
Metallic State ◽  
One Dimensional

The crystal structures and electronic and magnetic properties of conducting molecular magnets developed by our group are reviewed from the viewpoints of our two current strategies for increasing the efficiency of the π–d interaction. (EDTDM)2 FeBr 4 is composed of quasi-one-dimensional donor sheets sandwiched between magnetic anion sheets. The ground state of the donor layer changes from the insulator state to the metallic state by the application of pressure. When it is near to the insulator–metal phase boundary pressure, the magnetic order of the anion spins considerably affects the transport properties of the donor layer. The crystal structure of ( EDO – TTFBr 2)2 FeX 4 ( X = Cl , Br ) is characterized by strong intermolecular halogen–halogen contacts between the organic donor and FeX 4 anion molecules. The presence of the magnetic order of the Fe 3+ spins and relatively high magnetic order transition temperature proves the role of the halogen–halogen contacts as exchange interaction paths.

Crystal structure, magnetic behaviour and valence state of ytterbium in the Yb4Ni10+xGa21−x phase

2003 ◽  
Vol 350 (1-2) ◽  
pp. 9-16 ◽  
Author(s):  
L Vasylechko ◽  
W Schnelle ◽  
U Burkhardt ◽  
R Ramlau ◽  
R Niewa ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Valence State ◽  
Magnetic Behaviour

ChemInform Abstract: High-Pressure Synthesis, Crystal Structure, and Unusual Valence State of Novel Perovskite Oxide CaCu3Rh4O12.

ChemInform ◽  
2014 ◽  
Vol 45 (39) ◽  
pp. no-no
Author(s):  
Ikuya Yamada ◽  
Mikiko Ochi ◽  
Masaichiro Mizumaki ◽  
Atsushi Hariki ◽  
Takayuki Uozumi ◽  
...  
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
Valence State ◽  
Perovskite Oxide ◽  
High Pressure Synthesis ◽  
Pressure Synthesis

Valence state of cobalt atoms and crystal structure of YBa2Cu3−x-CoxO6+δ solid solution

2000 ◽  
Vol 41 (4) ◽  
pp. 626-631 ◽  
Author(s):  
V. I. Voronin ◽  
B. N. Goshchitskii ◽  
É. B. Mitberg ◽  
I. A. Leonidov ◽  
V. L. Kozhevnikov
Keyword(s):  
Crystal Structure ◽  
Solid Solution ◽  
Valence State

SYNTHESIS, STRUCTURAL AND MAGNETIC PROPERTIES OF DOUBLE PEROVSKITES Sr2CrWO6

2005 ◽  
Vol 19 (01n03) ◽  
pp. 537-540 ◽  
Author(s):  
T. S. CHAN ◽  
R. S. LIU ◽  
C. Y. HUANG
Keyword(s):  
Crystal Structure ◽  
Valence State ◽  
Room Temperature ◽  
Standard Sample ◽  
Double Perovskite ◽  
Lattice Parameter ◽  
Double Perovskites ◽  
X Ray ◽  
Structural And Magnetic Properties ◽  
X Ray Absorption

The double perovskite ( Sr 2 CrWO 6) has been prepared in polycrystalline state by solid state reaction. At room temperature, the crystal structure is cubic (space group: Fm3m) with lattice parameter of 7.8200(2) (Å). Both ρ( H =0) and ρ( H =5 T ) show a semiconductor-like behavior over the whole temperature range up to 5 K. The highest MR(magnetoresistance) value of 55% ( H =5 T ) was observed at 25 K. The valence state of Cr was determined by the X-ray absorption spectroscopy at Cr -L edge. The results, compared to the standard sample, show that the valence state of Cr is 3+.

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