NONLINEAR MAGNETIC RESPONSE AT THE CRITICAL POINTS OF GRAPHITE COMPOUNDS INTERCALATED BY TRANSITION METAL CHLORIDES

1993 ◽  
Vol 07 (01n03) ◽  
pp. 409-412
Author(s):  
M. HAGIWARA ◽  
M. KAWACHI ◽  
M. UCHIKOSHI ◽  
M. MATSUURA ◽  
S. FRANDROIS
Keyword(s):  
Transition Metal ◽  
Critical Points ◽  
Intercalation Compounds ◽  
Magnetic Response ◽  
Low Frequencies ◽  
Metal Chlorides ◽  
Spin Ordering ◽  
Graphite Intercalation ◽  
Magnetic Symmetry ◽  
Lower Transition

Ordering of CoCl 2−, NiC1 2− and CrCl 3−graphite intercalation compounds (GIC) is studied by observing nonlinear magnetic response at weak AC excitation fields and at very low frequencies. The result for CoCl 2− and NiCl 2− GICs supports the two-step hierarchical spin ordering model by confirming the non-breaking of total magnetic symmetry between the upper and lower transition temperatures.

Synthese und Struktur von Graphit-Einlagerungsverbindungen des Quecksilber(II)-chlorids / Synthesis and Structure of the Graphite Intercalation Compounds of Mercuric Chloride

1989 ◽  
Vol 44 (7) ◽  
pp. 721-728 ◽  
Author(s):  
Peter Behrens ◽  
Mehdi Alidoosti ◽  
Frank Schulz ◽  
Wolfgang Metz
Keyword(s):  
Mercuric Chloride ◽  
Preparation Method ◽  
Vapour Phase ◽  
Intercalation Compounds ◽  
Alkali Metal Chlorides ◽  
Graphite Intercalation Compounds ◽  
Metal Chlorides ◽  
Graphite Intercalation ◽  
Cell Dimensions ◽  
Diffraction Patterns

Graphite intercalation compounds (GICs) of mercuric chloride have been synthesized by four different methods: via the vapour phase, from melts of pure HgCl2, from melts of HgCl2, and alkali metal chlorides, and from solutions in concentrated aqueous HCl. Compounds of stages 4, 3 and 2 were obtained, respectively. GICs prepared from solution always show staging disorder. Pure stage compounds of stage three and four exhibit the following repeat distances along the c⃗ axis: c(3) = 1632 pm; c(4) = 1968 pm. Further structural analysis is hindered by the disorder phenomena common to GICs. Rather surprisingly, monochromatic Laue photographs probing the in-plane order of the intercalate reveal that - regardless of the preparation method - the diffraction patterns of all compounds are identical. The main phase possesses a monoclinic in-plane lattice with cell dimensions: a = 390(4) pm, b = 412(4) pm, γ = 108.6(3)°. A structure which resembles certain features of the structure of pristine HgCl2 is proposed for this phase. Another unidentified phase seems to stabilize this structure in spite of different amounts of chlorine excess probably occurring in compounds prepared in different ways.

Graphite intercalation compounds of d-transition metal fluorides

1987 ◽  
Vol 35 (1) ◽  
pp. 172
Author(s):  
A. Tressaud ◽  
J. Grannec ◽  
L. Lozano ◽  
B. Hun ◽  
S. Flandrois ◽  
...  
Keyword(s):  
Transition Metal ◽  
Intercalation Compounds ◽  
Graphite Intercalation Compounds ◽  
Metal Fluorides ◽  
Graphite Intercalation ◽  
Transition Metal Fluorides

Reduction of intercalation compounds of graphite with transition metal chlorides

1970 ◽  
Vol 19 (11) ◽  
pp. 2452-2453 ◽  
Author(s):  
M. E. Vol'pin ◽  
Yu. N. Novikov ◽  
Yu. T. Struchkov ◽  
V. A. Semion
Keyword(s):  
Transition Metal ◽  
Intercalation Compounds ◽  
Metal Chlorides
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