Binary and Ternary Alkali Graphite Intercalation Compounds: In-Situ X-Ray Study Of Elastic And Electrostatic Effects on Staging

1982 ◽  
Vol 20 ◽  
Author(s):  
M.E. Misenheimer ◽  
P. Chow ◽  
H. Zabel
Keyword(s):  
Interlayer Spacing ◽  
Intercalation Compounds ◽  
Concentration Region ◽  
Graphite Intercalation Compounds ◽  
X Ray ◽  
Small Defect ◽  
Graphite Intercalation ◽  
Spacing Variation ◽  
Elastic Distortion

ABSTRACTWe have studied stage transformations of binary potassium-graphite intercalation compounds by in-situ x-ray (00ℓ) scans. In the transition region of stages one and two, both stages coexist and all Bragg reflections exhibit resolution limited widths. The characteristics of the stage transformation are identical in intercalated HOPG and single crystals. This implies that the stage transformation is a direct process with no need of forming intermediate structures, favoring electrostatic interaction as the dominant stabilizer for pure stage donor compounds. We have also studied the elastic distortion due to potassium atoms substitutionally dissolved in rubidium intercalant layers. From the interlayer spacing variation we find a double force tensor Pzz = 0.36 eV for potassium defects in RbC8 in the small defect concentration region.

Preparation and Characteristics of Highly Expandable Graphite Intercalation Compounds by Two-Step Chemical Intercalation

2016 ◽  
Vol 703 ◽  
pp. 278-283
Author(s):  
Xiao Xia Li ◽  
Ji Jin Zhao ◽  
De Yue Ma
Keyword(s):  
Interlayer Spacing ◽  
Intercalation Compounds ◽  
Expandable Graphite ◽  
X Ray Diffraction ◽  
Graphite Intercalation Compounds ◽  
X Ray ◽  
Graphite Intercalation ◽  
Before And After ◽  
One Step ◽  
Scanning Electron

Graphite intercalation compounds (GIC) are the most common precursors for expanded graphites which are promising materials for many applications. A series of GICs with different expanding volumes (EV) were prepared by a two-step chemical intercalation way. Effects of the input of oxidant and intercalating agent on the EV of GICs were discussed. The microstructures and morphologies of graphites before and after intercalation were analylized by X-ray diffraction and scanning electron microscope, respectively. The results show that the GIC with an EV of 600 ml⋅g-1 may be prepared under temperal conditions by a two-step intercalation way. The interlayer spacing of the pre-GIC formeded by one-step intercalation is a bit larger than that of natural graphites, while the interlayer spacing of the GIC obtained by two-step intercalation becomes much larger than that of the pre-GIC because of secondery intercalation. When the d-spacing (d002) value of the GIC rises from 0.3590 nm up to 0.3711nm, its EV increases from 267 up to 600 ml⋅g-1 due to the decomposition and release of much more intercalated substances during a thermal shock.

Stoichiometric Determination of Graphite Intercalation Compounds Using Rutherford Backscatiering Spectrometry

1983 ◽  
Vol 27 ◽  
Author(s):  
L. Salamanca-Riba ◽  
B.S. Elman ◽  
M.S. Dresselhaus ◽  
T. Venkatesan
Keyword(s):  
Experimental Error ◽  
Rutherford Backscattering Spectrometry ◽  
Rutherford Backscattering ◽  
Intercalation Compounds ◽  
Graphite Intercalation Compounds ◽  
X Ray ◽  
Donor And Acceptor ◽  
Graphite Intercalation ◽  
Non Destructive

ABSTRACTRutherford backscattering spectrometry (RBS) is used to characterize the stoichiometry of graphite intercalation compounds (GIC). Specific application is made to several stages of different donor and acceptor compounds and to commensurate and incommensurate intercalants. A deviation from the theoretical stoichiometry is measured for most of the compounds using this non-destructive method. Within experimental error, the RBS results agree with those obtained from analysis of the (00ℓ) x-ray diffractograms and weight uptake measurements on the same samples.

Fullerenes Doped with Thallium Alloys

1992 ◽  
Vol 270 ◽  
Author(s):  
M. Kraus ◽  
M. Baenitz ◽  
S. GÄrtner ◽  
H.M. Vieth ◽  
H. Werner ◽  
...  
Keyword(s):  
Ac Susceptibility ◽  
Intercalation Compounds ◽  
Graphite Intercalation Compounds ◽  
Dc Magnetization ◽  
X Ray ◽  
Ternary Compounds ◽  
Graphite Intercalation ◽  
Thallium Alloys

ABSTRACTPrompted by earlier work showing that graphite intercalation compounds form superconducting ternary compounds in which thallium plays an important role C60 has been doped with Tl-alloys. Results of dc-magnetization, ac-susceptibility, X-ray analysis and NMR investigations will be presented.

In situ optical study of H2SO4-graphite intercalation compounds

1983 ◽  
Vol 8 (1-2) ◽  
pp. 189-193 ◽  
Author(s):  
M. Saint Jean ◽  
M. Menant ◽  
Nguyen Hy Hau ◽  
C. Rigaux ◽  
A. Metrot
Keyword(s):  
Intercalation Compounds ◽  
Optical Study ◽  
Graphite Intercalation Compounds ◽  
Graphite Intercalation

Towards High Temperature Actuation Using Graphite Intercalation Compounds

Aerospace ◽  
2005 ◽  
Author(s):  
Cameron Massey ◽  
William Barvosa-Carter ◽  
Ping Liu
Keyword(s):  
Elevated Temperatures ◽  
Pyrolytic Graphite ◽  
Compressive Load ◽  
Intercalation Compounds ◽  
Constant Current ◽  
Graphite Intercalation Compounds ◽  
Good Thermal Stability ◽  
Strain Behavior ◽  
Graphite Intercalation

Electrochemically formed graphite intercalation compounds (GICs) have many intrinsic properties well-suited for compact actuation in applications at high temperatures. GICs using ionic liquids are of interest because of their good thermal stability at elevated temperatures, high ionic conductivity, and low volatility. In this study we observed the potential and strain behavior of highly oriented pyrolytic graphite and 1-ethyl-3-methylimidazolium hexafluorophosphate subjected to a light compressive load and constant current. In situ measurements of the anode during intercalation showed a reversible strain of 2.5% to 4.5% from 100°C up to 250°C.

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