Diamond Definition and 116 Threads

We all know that when we scratch a diamond with another diamond, millions and millions of covalent bonds are broken. I would like to ask what happens when a diamond burns in the atmosphere at temperatures above 750 C? Does the reaction of oxygen and carbon also break the bonds, or are we dealing...

Can someone explain to me why at room temperature acids cannot dissolve diamond? Is it related to its hardness?

Is it true that hydrogen and oxygen atoms on the surface of diamond make it have such a low coefficient of friction?

Good morning! A question from a mere layman, so I hope you won't eat me :D Some time ago I read that every time one solid body makes some contact with another solid body, several billion atoms are lost from the surface of both the first and the second. On the Internet, I once read a post...

I was conversing with ChatGPT when I asked which material has the highest melting point, and it answered "tungsten" (giving its melting temperature). It so happened that in the previous question the melting point of graphite had come up, and it was listed as higher than that. When I asked which...

In terms of tetrahedral stacking, as occurs in diamond cubic, what I'm describing would be a system with additional tetrahedra in the empty cubes of that figure, but with their vertices on the opposite corners of the cubes that contain them to the "regular" diamond cubic arrangement. Due to the...

Hi everybody, I'm struggling with some solid state physics topics. I am dealing with the Carbon diamond crystal structure, which is basically made of 2 FCC compenetrated. I really cannot visualize the Wigner–Seitz cell of this structure, is it possible to do it? I was thinking about visualizing...

In a recent Scientific American article, Tammy Ma claims Jupiters core is solid diamond. She claims her work with lasers has demonstrated this. Any thoughts?

Hi guys , I want to construct a primitive unit cell for diamond, which is made of a fcc lattice and a basis of 2 carbons atoms. I know that a primitive unit cell isn't unique but the two variants I get are drastically different . As far as I can see they both include 2 whole atoms/points in the...

Are there any instructional video's on how to make your own CVD Diamond optics. I was looking online and CVD Diamond wafers are EXTREMELY expensive. Is it possible to make a plasma chamber for CVD if so does anyone have any good text recommendations What is the catch

I'm having hard time finding the center of inversion of cubic diamond structure. At first I thought (2,2,2) would be the center of inversion, but (1,1,3), (3,3,3), (1,3,1), (3,1,1) (i.e. four atoms inside the cube) are not centrosymmetric about (2,2,2).

does anyone know what is the average angle of infrared emission is by a flat diamond surface or tha directional distrabution

Dear All, I've been recently reading the very clear text of Burns and Glazer entitled Space Groups for Solid State Scientists in the context of my thesis which requires understanding of symmetries of crystals, more specifically symmetries of (approximate triply periodic minimal surfaces)...

Homework Statement I am asked to discuss the band structure of diamond. I saw the band structure of diamond has 4 filled valence bands and then 4 conduction bands. Silicon, the same. Homework Equations --- The Attempt at a Solution I'm feeling really silly because I don't understand why it is...

see this diagram of the structure of diamond given in my textbook- I have read in my textbook that each carbon atom in a Diamond crystal is attached to four other carbon atoms by strong covalent bonds.But, in the diagram above I can see that some of the carbon atoms are not attached to 4...

I have some diamond powder and was wondering how I can turn it back into its hard stone form? What can I do. I'm a hobbyist chemsit/physicist. I just need some help from more knowledge people

Hi, I was reading up on the properties on various materials but never quite found out what I was looking for. My question is this , I found out an explanation why diamond is the best thermal conductor even though its not a metal and why other materials that would be similar to diamond like glass...

Hello, I have been looking into NV in diamond and how it can be used for nanoscale magnetometry, and was wondering if anyone could help explain how it works or link to a paper that does. Is it just a spin 1 state (splits to 3 levels) that undergoes NMR or is there something else happening? I'm...

My books says Thermite reaction is an exothermic reaction, it release large amount of heat so that temperature increases upto 3500°C On the other hand it is written Melting point of diamond is 3500°C So my question is whether diamond can by melted in such reaction?

Hello, I'm trying to better understand the limiting factors in Diamond Anvil Cells that limit the achievable pressure to around 7 or 8 Mbar at the moment, despite not being a specialist. For example, is there a special reason other than the tiny size of the crystal sample used in DACs for why...

If a Helium ion He+ collides with a diamond wafer surface, an insulator, does the Helium ion, at 25 deg C, will the ion lose it's charge by gaining an electron from the insulative surface or does the ion have an elastic collision with no net energy loss or gain?

I am not sure if this is the right forum to put this on so sorry in advance: Hello, I am currently researching about diamonds. Could someone tell me any new research, technology or uses of diamond? I have tried googling and haven't come across much. Thanks!

I know the reasons that diamonds are stronger than covalent materials and ionic compounds. The former is weaker because there are intermolecular forces and the latter is weaker because if pressure is applied like charged ions would be forced together making it brittle. However, I cannot think...

Homework Statement Heat capacity is the ability of the material to store energy internally. If I completely insulated diamond and I put heat into it, It would have the ability to store 6.57 (Joules/mole) per degree Kelvin. Use this formula q=Cp (ΔT/ Δt) where q is heat in Watts, ΔT is...

Homework Statement Calculate the surface density (planar density) of the Silicon diamond structure in the [1 0 0],[1 1 0],[1 1 1] planes. Given a = 5.431 A (latice constant) Hint: For the (111) plane, it should help you to think of the diamond lattice as two interpenetrating FCC lattices.2...

hopefully something a little better than the wiki etc. What does a "deformed" one look like, or one drawn in the case of EPR, entanglement etc.

Aluminium has an fcc structure, which is a simple cubic lattice with four Al-atoms in the basis. On the other hand, diamond has a diamond structure, which is a simple cubic lattice with 8 atoms in basis. Now, diamond has optical modes in addition to acoustical, while Aluminium does not. What...

I was browsing amazon for some basic HDMI cables and was flabbergasted when I came across some by AudioQuest Diamond. They cost $1,494.75 for 6.5FT. https://www.amazon.com/dp/B003CT2A2M/?tag=pfamazon01-20 The information gives Solid Perfect-Surface Silver (PSS) Conductors Low Jitter, Low...

How thin would a pure diamond plate have to be cut for a bullet to penetrate or fracture the plate if shot from a 50 yard distance? (assuming it is a spot on shot and the plate is octagonal and 15 cm across, and the bullet being a standard 50 caliber round.)

If a drill bit that was cut out of a single large diamond were made, would it last forever, assuming it was never used to drill through diamond and was never exposed to a laser? Would it ever get dull or break?

Radio or any other wave in electromagnetic spectrum? Sound perhaps? And at what frequency(ies)

Why diamond lattice structure is a hardest (?) one? If it is because each atom connected to 4 adjacent, then why simple cubic, where each atom connects to 6 adjacent is not the case? And why ZnS having the same geometrical structure is not as strong as, say, carbon, or silicon diamond? Thank you.

Hi, Is the circuit in the attached image essentially one with three parallel branches, each with a different source of emf and two resistors? ie, ε1, R1, R2 on one branch, ε2, R3, R4 on another, and similarly for the last one? Thanks!

Homework Statement Verify that diamond becomes more stable than graphite at approximately 15 kbars Homework Equations The Attempt at a Solution So, I understand that to show one substance is more stable than another at particular environmental conditions, I just have to show...

I have the following homework question I am working on. I am given three scattering angles: 42.8, 73.2, 89. (in degrees) without the wavelength of the light used. I am to show that these are consistent with a diamond lattice. I started with Laue's Law: delta(k) = G and according to the...

Carbyne is comprised of chains of double- and triple-bonded carbons and is believed to be stronger and stiffer than graphene, nanotubes, or diamond: http://www.technologyreview.com/view/518301/new-form-of-carbon-is-stronger-than-graphene-and-diamond/ To me, this reminds of Arthur C Clarke's...

Hello MHB, I am working with a exemple that I think they got some incorrect. Exemple 10.Show that diagonals in a diamond(romb) is orthogonal. I understand that AC•BD=0 cause of dot product and if it's orthogonal the angle is \frac{\pi}{2} I understand all the part until the step before the last...

I have some difficulty understanding how the volume per unit cell for the diamond structure is calculated. I've seen in various websites that this volume is: ##v=a^3 = \left( \frac{8r}{\sqrt{3}} \right)^3## Here ##r## is the radius of an atom. But how did they work out ##a## (the edge of the...

In diamond valence electrons are fully covalently bonded.But in graphite only three are covalently bonded while one electron is freely moving.So it seem that melting point of diamond should be higher than that of graphite because in diamond we should break four covalent bonds while in graphite...

Let’s also say that 65% of all diamond rings sold in WV are yellow gold. In a random sample of 20 folks, what is the probability that 12 have purchased yellow gold diamond rings?thank you and I promise this is the last question today.:D

Planet PSR J1719- 14386 is a planet completely made of diamond. I've wondered what the estimated worth of the planet's material, perhaps you guys know?

Homework Statement The gap between valence and conduction bands in diamond is 5.47 eV. (a) What is the maximum wavelength of a photon that can excite an electron from the top of the valence band into the conduction band? In what region of the electromagnetic spectrum does this photon lie...

http://news.yahoo.com/russia-reveals-shiny-state-secret-awash-diamonds-131212873.html

Homework Statement Hi, there are 2 pictures in the above,pic 2 shows a diamond in rectangular shape. pic 1 shows the 3D structure of that diamond at a corner of it. As we know,diamond has a giant covalent structure,which means atoms in it are linked together by covalent bonds only...

I have difficulties in finding the true black carbons in a diamond from an image. Since diamond has a high refractive index of 2.42, it has a critical angle of 24 degrees such that total internal reflection can easily occur (total internal reflection causes fire in diamond) . Now I have...

Hi guys I wonder if anyone could help me help my son create an energy source for his school project. All my son is allowed to use (he doesn't have to make it just proove it might work) is a perfect diamond with 6 equal sides all lengths the same size (like 2 pyramids base to base), Matter...

Homework Statement At low temperatures, Cv of solids is given by: Cv = D(\frac{T}{\Theta})3 where: D = 1.94*10^3 \Theta = Debye Temperature, for diamond 1860K If 100J of heat is transferred to 1mole of diamond, initially at 10K. Calculate the final temperature. Homework...

Ok, I understand the difference between diamond and graphite but how is it that diamond actually forms? Why is that carbon forms one way at one time and a different way at another time? My best guess is that you have to subject the carbon to enormous pressure because it looks like diamonds...

Hey there, First of all I want to apologize for my English, haha. So for a project I came up with the idea of making diamond. It sounds a bit impossible, but I've found some good theories (and proven) experiments. 1 is with pure alcohol, and the other one is about making diamond with a...

Diamond vs graphite by a conductivity? Hello. This is the last question on HW. Q) Diamond and graphite are both made of carbon atoms. Explain why diamond is elecrically insulationg while graphite is a good conductor in terms of type(s) of hybridization of atomic orbitals and bonds in each...