Diamond Definition and 116 Threads

http://news.cnet.com/8301-17852_3-20097817-71/astronomers-weve-found-a-planet-made-of-diamond/" I have absolutely no prediction about this thread, and with the cast of regulars we have here at PF, am hoping it will generate some funny, interesting discussion. Pengy, Jimmy, Evo, Lisa are you...

https://www.youtube.com/watch?v=ylGwsIIyZf0 Reference: http://en.wikipedia.org/wiki/PSR_J1719-1438"

How to prove there is no primitive cell of diamond structure with only one atom? Thanks in advance!

Setting is like this: I have 52cards of 4 shapes. that's 13 each. I take one card out and put it in a hat. now with 51card I draw 3 consecutive cards. It happens to be that I picked 3 diamonds. Now I want to find the probability of the card in the hat be a diamond. My friend said it...

Heya Everybody! I was searching for papers on the Aerodynamic characteristics of diamond wings, I mean detailed research papers/ literatures/ E-books...as a part of my assignment cum Thesis. Unfortunately, I could'nt find many. If anyone of you could please guide me as to where I will be able to...

Hi, all. Does anybody know the 0K entropy of diamond and graphite? According to the third law of thermodynamics, the entropy of one of carbon polymorphs which should be called perfect crystal goes to 0. How about diamond and graphite? Thanks.

Homework Statement Question Given that the speed of light in a vacuum is 3.0 x 10^8 ms^-1, calculate the speed of light in a diamond of refractive index 2.4. Homework Equations - 3. Attempt So if the refractive index is 2.4, which means 2.4 = sin i / sin r, how can I solve this question...

I'm working with a television production company on a new project - we're looking at using "backyard methods" to produce diamonds (nothing special, we'll be happy with industrial grade for the show), namely using an unconventional technique reportedly used by the soviets during the cold war...

So I was looking online at a company called Apollo diamond...they have a method for making diamond called chemical vapor deposition. Essentially, it is a method where a seed diamond is placed in a carbon gas and layer upon layer of carbon atoms are deposited on the seed and the diamond grows...

Why is a boron doped diamond xtal blue ? hello :) Unfortunately I am not able to find the quantitative description of how a concentration of 1ppm Boron doped in a diamond crystal can produce a blue color such as the http://en.wikipedia.org/wiki/Hope_diamond" ? The doped boron creates an...

Does anyone have any expertise in the coating of WC tools? Are these tools coated by a deposition process (ex. CVD)?

hello how can I find the angles between the tetahedral bonds of a diamond lattice & what are the direction cosines of the nearest-neighbor bonds with the atom at the origin along the x, y, z axes ?

Hi, these are a couple of questions from a lab at uni, i wasn't entirely sure where to begin so if anybody has any idea help would be much appreciated (i)A large model of the diamond structure can be described as two interpenetrating FCC lattices (i haven't found any diagrams that display...

Hi I am doing a research project into the use of diamond in MEMS and I've got a few questions for anyone who knows a bit about this field: 1) What are the major uses of diamond in MEMS (I haven't found nearly as many as I would have expected)? 2) Is Microwave plasma CVD the best way for...

Hi I am doing a research project into the use of diamond in MEMS and I've got a few questions for anyone who knows a bit about this field: 1) What are the major uses of diamond in MEMS (I haven't found nearly as many as I would have expected)? 2) Is Microwave plasma CVD the best way for...

Hi I am doing a research project into the use of diamond in MEMS and I've got a few questions for anyone who knows a bit about this field: 1) What are the major uses of diamond in MEMS (I haven't found nearly as many as I would have expected)? 2) Is Microwave plasma CVD the best way for...

I know about the strong covelant bonds, but just why is diamond so much better than any other material for drilling?

In my lecture, my chemistry professor talked about Bonding in Solids. And he asked us whether diamond can melt(in other words, does diamond can have liquid state). And he did not know either. And I was a bit confused. Because in my textbook, it says that Diamond is covalent network solid and...

I have a couple questions regarding the transformation of graphite to diamond. As I understand a common method of diamond synthesis involves applying high pressure and high temperature to a graphite sample for a few days and then removing the high temperature and finally the high pressure to...

I've been thinking about this question for a little while now and figured maybe a good answer here would help to resolve it. Can glass ever break diamond? Some people I know say it's impossible and yet I am left thinking that it is just a matter of how much power is generated by the impact of...

If I have one pound of gold heated and compressed into a diamond, what will the weight of the diamond be? PS

What is the melting temperature (in fahrenheit) of diamond?

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...

http://www.ph.ed.ac.uk/~pmonthou/Statistical-Mechanics/documents/SM9.pdf In the third last paragraph of p36, we are told that the Einstein model discussed in this lecture succesfully explains the low heat capacity of diamond - i can't however see how it does, or at least find an explanation...

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...

1.Hey! I don't get the solution to the following question so I am hoping someone can explain! Ok so, the question is we have Silicon, which I have read has a DIAMOND LATTICE structure. Which basically seems to mean two face centered cubes come together. Now I need to calculate the VOLUME...

Does anyone know how the diamonds in a diamond drill bit are attached to the drill? I tried google but didn't find much help regarding this question. I did find a picture of a diamond tipped drill: http://www.diamond-drill-bit-and-tool.com/Diamond-Drill/MAIN.htm But no explanation of how...

I'm doing MD calculations and I am having trouble providing a satisfactory explanation for the following to my profs. I am trying to calculate c44 for a diamond cubic crystal (Si), and to do that I have to calculate energy vs shear strain. For each value of the shear strain, I have to do...

Like a diamond in the sky... (with video) Rosetta Spacecraft Passes Asteroid Steins . Garth

Do diamonds get affected by any acidic or alkaline liquids the one which is present in the toilet cleaners and the nail paint removers...

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...

Even problem, very please! A baseball diamond is a square with side 90 ft. A batter hits the ball and runs toward first base with a speed of 24 ft/s. a) At what rate is his distance from second base decreasing when he is halfway to the first base? b) At what rate is his distance from third...

http://dsc.discovery.com/news/2008/01/08/hope-diamond.html

When is light totally internally reflected in a diamond? I thought it was at the critical angle of 24.5?

Homework Statement Diamond tip presses are now capable of creating pressures in excess of one million atmospheres. Suppose the tips of the presses were circles with an diameter of one millimeter. How much force must be applied to the tips to create a pressure of one million atmospheres...

There is a patent (5437243) that describes a method of allotropic conversion of graphite to diamond using a supercritical current (1,000,000 columns) 4 microseconds >1000 volt potential. The patent sounds a little iffy and of course I do not understand the principles behind the claim. I was...

Are there any chemical compounds that include carbon as diamond?

The maximum mass of a 'naturally existing' cryogenic diamond crystal is equivalent to the Chandrasekhar limit of M_{t} = 1.43 \cdot M_{\odot} and is called a Black Dwarf star, and can explode in a Type Ia supernova with energy: E_s = 1-2 \cdot 10^{44} \; \text{joules}. A Type Ia supernova...

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 =...

***** A Refraction of Light Question : Why Does Diamond Sparkle More? (Ans. ASAP please) I have thought about this question for a while now,but I can't figure out the answer: Diamond has a critical angle of 24 degrees. Crown glass has a critical angle of 42 degrees. Why does a diamond...

Anyone know that result? Comments? How is it connected to algebra in general and what kind of algebra is it part of? It is obviously about rings but what else is it part of?

Hi everybody... I have a question and i hope u could help me. Consider the diamond structure as simple cubic with 8 basis atoms. obtain the first two planes contributing to x-ray reflection from the diamond structure.

I know acoustic and optical phonons can interact with one another. Also, longitudinal and transverse phonons can interact with one another. I am wondering can a longitudinal phonon in one plane act with a transverse phonon from another plane to create a third phonon? Or, do these...

So I have two (somewhat) related questions. 1) Why is it wheel rims (or spokes) sometimes appear to spin backward? Everytime I see this it drives me crazy. I just cannot figure out how a wheel spinning real fast in one direction appears to be spinning real slow in the other direction. 2)...

Is a diamond a single molecule?

I just saw Blood Diamond. I don't know how to say this, but I am never going to buy a diamond in my life.

Homework Statement Diamond crystallises with a cubic unit cell and the lattice is face centred.Calculate the respective angles(in degrees) at which the lowest first four reflections are allowed from a polycrystalline specimen of diamond(given (wavelength)^2/4a^2 = 0.0467,where a = unit cell...

It is mom and dads soon and i am stuck as to what i can get them, is there a traditional present?

Refraction problem! Homework Statement A beam of white light is incident on the surface of a diamond at an angle Theta_a. Since the index of refraction depends on the light's wavelength, the different colors that comprise white light will spread out as they pass through the diamond. For...

I was checking out diamond anvil cells and i have few questions. I have been on this sites: http://www.physlink.com/Education/askExperts/ae483.cfm (1) http://www.matweb.com/search/SpecificMaterial.asp?bassnum=CDiamA (2) http://merkel.zoneo.net/FEM/index.php?lang=en (3) 1.what is max...