Graphite (), archaically referred to as plumbago, is a crystalline form of the element carbon with its atoms arranged in a hexagonal structure. It occurs naturally in this form and is the most stable form of carbon under standard conditions. Under high pressures and temperatures it converts to diamond. Graphite is used in pencils and lubricants. It is a good conductor of heat and electricity. Its high conductivity makes it useful in electronic products such as electrodes, batteries, and solar panels.
This one has also puzzled me for quite some time.
How come that glass, water and diamonds for instance are transparent while for example graphite is not?
Furthermore, since the light travels at lower speed in glass and in water than it does in vacuum, it must mean that the photons interact...
Homework Statement Go through the arithmetic to verify that diamond becomes more stable than graphite at approximately 15 kbar
How can diamond ever be more stable than graphite, when it has less entropy
Homework Equations
The Attempt at a Solution
(dG/dP)=V, T and N are fixed.
dP=15 kbar...
Homework Statement
Calculate the pressure at which graphite spontaneously changes to diamond.
T = 298.15 K (isothermal)
Vdiamond - Vgraphite = -2 x 10-6m3/mol
At 273.15K and 1 bar (105 Pa):
ΔGf graphite = 0
ΔGf diamond = 2.9 kJ/mol
i.e. graphite is the more stable and preferred...
Why is diamond a poor conductor of an electric current and graphite a good conductor?
all i can come up with is that diamond is a good insulator and that the fundamental difference between graphite and diamond being that graphite molecules are flat groupings of carbon atoms while diamond...
Pressure induced transition of graphite to diamond -- homework help
Homework Statement
Process is being carried out at 25*C and requires an increase in pressure until he graphite and diamond are in equilibrium. The following data is given at 25*C
dG(25*C, 1atm) = gdiamond - ggraphite =...
Dear Folks:
I have been experimenting with composite conductor materials for a while, but have had little success with getting conductivity below 200 ohms/cm.
Polystyrene gel is easy to make and offers recycling opportunities, so I have been using this as a starter binder.
Found that if...
This is a long shot, but maybe someone will know or can point me in the right direction. I'm looking for an experimental value for the contact angle between tetrahydrofuran (THF) with both mica and graphite substrates. I've done numerous googling and also did a search on the web of knowledge...
A little coursework question.
In one of my sources, of research it says that "Graphite has a theoretical specific capacity of 372mAh/g, much higher than most other electrode materials that have proven their worth in the battery industry." I'm not sure if mAh/g is a measure of current vs...