Study of chemical species that are in solid phase, either in cases of their properties, or about ways of synthesizing them.

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How to measuring viscoelastic property of a non rigid solid using QCM D

I am looking into measuring the viscoelastic property of a non rigid solid using a quartz crystal microbalance dissipation (QCM-D). I was wondering there is a way to deposit my solid onto the ...
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7 views

Composition of last drop [on hold]

P°a = 500torr , P°b =300 torr . A liquid solution of A and B in which Xa = 0.6 is taken in a cylinder fitted with freely moving piston . The solution is slowly vapourised at 300 K by decreasing the ...
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20 views

Find coordination number [on hold]

If we are given the radius of Mg+2 and O2- as 0.65 A & 1.40A respectively . Then how can we calculate the coordination number of cation in the crystals of MgO . Can anyone tell me concept behind ...
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1answer
28 views

Cutting a Solid with a sharp edged tool

The third point of difference suggests that amorphous solids can't be cut into two parts of regular surfaces But glass being an amorphous solid is cut into regular pieces often. What am I getting ...
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15 views

Determine the quantitative composition of a solid sample containing Co, Mn, Al, C, and O

I have a solid sample that contains Co, Mn, Al, C, and O. The sample mass is ~200 mg. I need to determine what the composition of this sample is. I've looked at atomic adsorption spectroscopy, but ...
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d-orbital splittings in WS2 monolayer

The formely degenerate $d$ orbitals of the tungsten atoms in the $\ce{WS2}$ monolayer are split into three groups: (1) $\mathrm{d}_{z^2}$, (2) $\mathrm{d}_{x^2-y^2}, \mathrm{d}_{xy}$ and (3) $\mathrm{...
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15 views

Solids, Liquids and Gases [duplicate]

Why is Melting and Freezing point the same? I know that they both equal 0 degrees celcius but I cant seem to find out why.
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23 views

What hinders Monoclinic crystal system from having face centered variation and body centred variation?

Base centered monoclinic cubic cells exists.I think that we can just place some lattice points at the center of other faces to get a Face-Centered structure. But, Two monoclinic Bravais lattices ...
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7 views

Source for perovskite SCY material for PCC experiment

I've read several papers on Solid State Ammonia Synthesis and all of them seem to use a "Proton Conducting Ceramic". I'm researching more on the material but I cannot find how it's actually made or ...
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31 views

Ionic radius paradox

consider a compound AB which forms cubic close packing(FCC) structure in which B forms FCC and A occupies the octahedral voids.let x and y be the radius of A(cation) and B(anion) respectively.if we ...
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38 views

Defects of Crystals

So while studying defects, I found that: Interstitial defect is when constituent particle is present in the interstitial site. My question is where this constituent particle is coming from? As it ...
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35 views

Voids vs Interstitial Site?

I am studying solids states. So we studied different lattices of Ionic solids by introducting smaller Cations into VOIDS. Next topic is of defects. SO it is written Frankel defect arises when a ...
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19F MAS NMR chemical shift tensor and the crystal structure

$\ce{^{19}F}$ MAS NMR is measured on fluorine-doped $\ce{TiO2}$. $\ce{F}$ is to substitute $\ce{O}$ and the crystal structure is anatase, which has a tetragonal crystal system with a space group $\ce{...
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78 views

Why are certain reflections forbidden in body centered cubic and face centered cubic structures?

I know that for body centered cubic structures the allowed reflections only happen if h+k+l is even and reflections are forbidden is h+k+l is odd, and for basic face centered cubic structures (...
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12 views

Electronic Transport Phenomena not covered by Bandstructure in Solid State Physics

From what I have read, most of the electronic transport phenomena in solids state physics seems to able to be determined with the bandstructure. Schottky Barriers, bandgaps, band discontinuities can ...
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30 views

Fraction of cube Volume empty [closed]

The unit cell in a body centered cubic lattice is given. Each sphere has a radius r and the cube has a side a. What fraction of the total cube volume is empty?
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26 views

Band alignment of heterojunctions

I have seen several band bending diagrams in journals and the web. However, I am not sure as to how they align them. Some diagram appear to align the vacuum level and some align them by Fermi Level. I ...
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39 views

Zinc oxide reduction in ethanol

I'm trying to prepare a ZnO thin film deposited on a glass substrate. The precursor solution prepared by sol gel process through dissolving 1 M zinc acetate dehydrate (ZAH) in ethanol with ...
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1answer
341 views

Why are X-rays used in crystallography?

Can any other wavelength of electromagnetic radiation be used? Why can't gamma radiation be used?
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220 views

Materials with solid volume greater than liquid volume

Water has a solid volume greater than its liquid volume. This question is in two parts. 1) Are there other materials that have solid volumes greater than liquid volumes? 2) What about the structure ...
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198 views

Colour due to F-centre is same as that produced in a flame test, why?

I have noticed that the colours that the F-centres impart in Alkali metal halides are the same that the corresponding alkali metals impart to their flames. $\ce{NaCl}$ when heated in an atmosphere of ...
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53 views

What are the physical properties of exotic ice?

This chart shows the phases of water that form at various combinations of pressures and temperatures. It has multiple exotic forms of ice (labeled II through XV) listed. What are the physical ...
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1answer
86 views

How to calculate Madelung's constant for NaCl?

Madelung's constant for $\ce{NaCl}$ is $1.748$. What I tried to so is sum up all the individual interactions into $1$ component where the $X$s are the nucleus and the electron if it was a $2$ atom ...
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42 views

How can the bulky octadecyltriethoxysilane molecule promote single-crystal growth?

Octadecyltriethoxysilane is very bulky (source), yet it was used to promote single crystal growth (source). How can such a bulky molecule induce crystal growth? (For example epitaxial growth ...
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28 views

What is the number of particles in unit cell of diamond? [closed]

Diamond forms fcc lattice and hence should ideally have 4 particles in unit cell. But due to presence of extra atoms it has 8 particles in unit cell.
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45 views

Sulphur in powdered form: what structure?

Quoting this paper: A variety of allotropic states of elementary sulfur have been identified. Solid crystalline sulfur exists either as rings of 6-12 sulfur atoms (cyclohexasulfur, $\ce{S6}$, ...
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How dangerous are non-soluble trivalent thallium compounds?

I am PhD student in solid state physics. I have been working with a fine powder of a transition metal oxide containing trivalent thallium. The oxide is not soluble in water. In my university, ...
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44 views

Tetrahedral arrangement of particles in cubic unit cell

What is arrangement (diagrammatically) of particles (atoms) in cubic unit cell so that I can correctly find out the radius ratio?
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75 views

Oxidation state of metal ion in unit cell

If a cubic unit cell for a metal nitride has nitride ions at all face and corner positions, and metal ions at all edge positions, what is the oxidation state for the metal ion in the nitride? I ...
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22 views

Reference request for properties of amorphous titanium carbide (a-TiC)

I assume through some side reaction I'm getting $\ce{TiC}$ in my $\ce{TiO2}$ samples after calcination and I need some basic information about the properties of amorphous $\ce{TiC}$. Is it ...
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21 views

What is the difference between phase of matter and state of matter? [duplicate]

I am still confused on the differences between the phase of matter and state of matter
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1answer
90 views

Why some compounds form different crystal structure at different temperature?

Lets take an example :- Sodium superoxide has three different crystal structure, the marcasite structure at nearby 81 K, the pyrite structure between 196 K and 223 K and calcium carbide ...
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1answer
74 views

Relationship between coordination numbers and stoichiometry

In fluorite ($\ce{CaF2}$), the coordination number of $\ce{Ca}$ is $8$, and that of $\ce{F}$ is $4$. Is there any logic behind the ratio of coordination numbers being the same as the stoichiometry of ...
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1answer
233 views

What is the lattice structure of manganese?

A transition element is defined as the one which has incompletely filled d orbital in its ground state or in any one of its oxidation state. Zinc , cadmium and mercury are not typical transition ...
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1answer
53 views

Refractive properties of materials?

I've just read this article about meta-materials with 0-refractive index, which potentially may "permit" light with super-luminous rate /under rate is meant the propagation of light's phase, which ...
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1answer
32 views

How to eliminate electrostatic charges from $\ce{TiO2}$ powder

I have synthesized $\ce{TiO2}$ nanoparticles via sol-gel method and I need to calcine it at elevated temperatures for the crystal phases formation. The powder is very highly charged and not only ...
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46 views

Reason for isotropy in amorphous substances

I'd be thankful if someone explains why amorphous substances are said to be isotropic and crystalline substances anisotropic
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1answer
57 views

Must compounds formed between solids be a solid as well?

My teacher gave us a long list of compounds and asked whether they are solid/liquid/gas at room temp and normal atmospheric pressure. I only know the more common ones (eg. carbon dioxide, ammonia) and ...
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Resource recommendation to visualize voids in hexagonal unit cell

I started learning solid state chemistry recently. I am having great problem visualizing voids in hexagonal unit cell. Is there any online 3D model/drawing which can help me in visualizing? I need to ...
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2answers
108 views

How can diamond have a fixed refractive index?

I was doing a lesson on solid states. There were given two kinds of solids namely amorphous solids and crystalline solids. Some differences between these two solids were given in my book. One of the ...
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1answer
254 views

What is the oxidation mechanism of gunpowder?

I've been recently looking into fireworks and the chemistry of explosives, and I found out that, amongst others, one of the most important reactions in gunpowder ignition is the oxidation of charcoal ...
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1answer
102 views

Why is Cubic closed packing called “cubic”?

How is Cubic Closed Packing "cubic" and also how is hexagonal closed packing "hexagonal" ? I have been thinking over this since a few hours but I am unable to visualise. I understand that when ...
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Why are there only 7 types of unit cells and 14 types of Bravais lattices?

Why are there only 7 types of unit cells and 14 types of Bravais lattices? I was reading about solid state chemistry for the first time and this limitation made no sense to me. I tried to do the ...
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222 views

Why does the dielectric constant of a solid increase due to a Frenkel defect?

In crystalline solids, an atom may be displaced from its original position in order to create a vacancy in the original location. This is referred to as a Frenkel defect. Why does this defect result ...
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1answer
465 views

Yellow Color of NaCl

My book says - "NaCl shows metal excess defect, which results into the formation of an F-center in the crystal. This F-center is responsible for the yellow color of NaCl." My question is, how does an ...
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1k views

Why is solid phase peptide synthesis limited to 70 amino acids?

I'm reading document about Solid phase protein synthesis (SPPS) from Wikipedia, and according to the document: SPPS is limited by yields, and typically peptides and proteins in the range of 70 ...
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96 views

Stability of radium oxide

Why is radium oxide yet to be isolated when a wide range of other radium (II) compounds are known ?
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134 views

Why is the electrical conductivity of Cu(I) better than that of magnesium? [closed]

My professor said it is because each atom has a different electron and atomic nucleus structure, so bond distance changes. But in some cases orbitals overlap which causes the band gap to disappear. My ...
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1answer
478 views

What is the world's finest powder substance?

What is the world's finest powder substance that has the smallest granules but remains solid?
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136 views

Are molecular optimizations in quantum chemistry really in vacuum?

I know that Gaussian (or other quantum chemical packages) assumes the molecule is alone in vacuum, that is, the molecule doesn't interact with anything, when optimizing the molecule. But I've found ...