Questions tagged [solid-state-chemistry]
Study of chemical species that are in solid phase, either in cases of their properties, or about ways of synthesizing them.
336
questions
0
votes
2
answers
64
views
Regarding colour visibility due to F-centre
Below shown image is a cut out from the NCERT book.
Referring to the highlighted sentences:
I know that an $\ce{e^-}$ absorbs and emits light of a particular wavelength when bound in an atom and ...
- 68
2
votes
0
answers
27
views
Factor Group Analysis of Na2SO4 - Site Group Symmetry
I'm still trying to understand how to construct a factor group analysis for a given molecular point group and the resulting solid state group symmetry. For this I searched for some examples and found ...
- 4,182
2
votes
1
answer
138
views
How do different x-ray tube emission profiles (i.e copper vs cobalt sources) affect XRD samples containing iron (results included)?
Background:
I'm a student and have recently done some XRD on some iron ore mine tailings which came from an Australian mine tailings storage dam. The redness in colour and industry source led me to ...
- 427
2
votes
1
answer
41
views
Why and how are mullites (and in extension solid solutions) formed and how are their formulas conceived as opposed to regular crystalline solids?
From doing more Phase ID for XRD on aluminosilicate based coal fly ash samples, I've seen mullite phases appear a few times which have the non-stoichiometric chemical formula $Al_{4+2_x}Si_{2-2x}O_{10-...
- 427
0
votes
1
answer
35
views
Is there any calcium carbonate analogue drawing carbon from dry air?
Is there a nonliving (wood does not count) substance or process that accretes a solid material by withdrawing carbon from the air, in a manner analogous to calcium carbonate being accreted from ...
- 25
1
vote
1
answer
38
views
Solid state chemistry current in tunnel diode [closed]
I am interested in this subject: Applied Mathematics in Electrical Engineering. I am interested in finding an expression for the tunnel current of a tunnel diode in the negative differential ...
- 193
1
vote
0
answers
55
views
Why can we use the arrhenius equation to measure the number of vacancies in a material?
In a materials science video I was watching today the prof. said we could use the arrhenius equation to estimate the number of vacancy point defects in a material. And gave the following equation:
Nv =...
- 121
2
votes
1
answer
68
views
What are some good synthetic samples I can make myself to start getting better at Quantitative X-Ray Diffraction?
I'm a student wanting to become an expert in quantitative X-Ray Diffraction (QXRD) to determine the wt%s of both crystalline and amorphous phases in a solid specimen. At my university I have access to ...
- 427
6
votes
1
answer
224
views
How does heating alkali metals with graphite change its conductivity and density?
My textbook says when heating potassium, rubidium, cesium with graphite, the metals react by invading the space between the layers. They form highly colored interstitial carbides that are non ...
- 281
2
votes
0
answers
75
views
Is there a chemical compound which does not have a liquid state but a solid and a gaseous state? [duplicate]
Is there a chemical compound which does not have a liquid state but a solid and a gaseous state? Meaning no matter the temperature or pressure it will never be in its liquid form. According to my ...
- 137
2
votes
1
answer
163
views
Why is diamond not the most dense substance?
Diamond is the hardest substance on earth which can be attributed to its tightly-bonded crystal lattice. Hence, assuming there were a substance more dense than diamond (which there are), mustn't it be ...
- 173
4
votes
1
answer
189
views
How do you write fractional hydrates in words?
Apart from sequihydrate and hemihydrate (1.5 and 0.5 respectively), I can't find a way to write any other fractional hydrates.
Wikipedia states:
The notation "hydrated compound⋅nH2O", where ...
- 303
2
votes
1
answer
143
views
What is m.2m point group?
I'm using Bilbao Crystallographic Server to find 3D crystallographic point groups of the K points of anatase TiO2.
Since the space group of anatse TiO2 is $I4_1/amd$, on this page, I found the point ...
- 353
-4
votes
1
answer
98
views
How Amorphous solids are converted to Crystalline?
I know about a process of Annealing where a crystalline solid is heated to its melting point and then cooled rapidly so as to form amorphous solid which has random crystallite in uts structure.
But ...
- 107
11
votes
2
answers
3k
views
How can brass still be made even though the crystal structures of zinc and copper are not the same?
Based on the Hume-Rothery rules, to dissolve an element into a metal, the crystal structures for both must be the same. But the structure for zinc is HCP, whereas copper has FCC structure. It does not ...
- 111
2
votes
0
answers
47
views
How do other elements fit into a diamond's carbon lattice (e.g. nitrogen in yellow diamonds)
Traditional pure-carbon diamonds have a simple structure (tetrahedral, if I'm not mistaken). But common types of diamonds have other elements within them. For example, yellow diamond has nitrogen in ...
- 121
0
votes
0
answers
20
views
What is the net gain of charge carriers in a semiconductor if an atom is removed?
In pure germanium, all Ge atoms are bonded with a tetrahedral geometry. It has a band gap and is a semiconductor. If we remove one Ge atom, what type(s) and how many charge carriers will be generated? ...
- 1
0
votes
0
answers
41
views
why an interstitial defect increases density in covalent solids and do not increases in ionic solid?
The interstitial point defect increases the density of a solid. Frenkel defect is also a type of this defect but it do not increases the density.
Also, the mass / volume concept of density tells us ...
- 208
0
votes
2
answers
97
views
Two atoms exist in the same coordinate position in the lattice?
I am trying to simulate the properties of FeF3(H2O)3, so I download its crystal structure file from Crystallography Open Database, but it seems that in the lattice, ...
- 161
-2
votes
1
answer
332
views
In calculating the radius ratio in a tetrahedral site in an FCC lattice, why do we take tetrahedral void in the middle of the body diagonal line? [closed]
When calculating the ratio of cation / the ratio of anion in a Tetrahedral system in an FCC lattice, why do we take the void to be in the center instead of it being √3a/4 from the corner.
-1
votes
2
answers
74
views
Why does density decrease when pressure is increased on an NaCl type lattice?
I was told that the effect of pressure on an NaCl type structure would make the atoms come closer and therefore change the type to CsCl type making Z (no of atoms per unit cell) go down, hence density ...
- 19
1
vote
0
answers
50
views
What is the paramagnetic susceptibility of sodium at around room temperature?
Proposed solution:
This question comes from Tanner's manual Introduction to the Physics of Electrons in Solids, at the chapter dedicated to the application of the Fermi gas model. The Fermi energy is $...
- 39
0
votes
0
answers
37
views
Restoring potential of atoms in a solid
Above $\pu{0 K}$ the atoms in a solid are vibrating. However, what kind of potential restores each atom in the starting position?
Consider the crystal lattice of NaCl. The potential energy of a $\ce{...
- 193
0
votes
1
answer
136
views
Balancing a chemical reaction with oxidation numbers
We have been teached how to balance chemical reactions with oxidation numbers in school, but somehow I can't understand it.
This is the equation to balance
$$\ce{Cu(s) + NO3−(aq) + H+(aq) -> Cu^2+(...
- 9
0
votes
0
answers
60
views
Why Lambert's law does not hold for photoresistors?
Why don't photoresistors made of Si obey Lambert's cosine law? Is it related to the dark current of the photoresistor? I couldn't find any solution while searching the web.
- 193
1
vote
1
answer
1k
views
Comprehensive list of metal alloys along with Moh's hardness scale
Material property lists, such as springermaterials.com, has lists of metal alloys and their properties. Is there a similar website that lists alloys along with their Mohs scale hardness? For ...
- 29
5
votes
1
answer
250
views
Why can't the Fajans' rule and lattice energy theory be used to explain the difference in thermal stability of magnesium and calcium carbonates?
$\ce{CaCO3}$ is more thermally stable than $\ce{MgCO3}.$ I do understand that a larger cation would be able to stabilize a larger anion to a greater extent, but why can't we use Fajans' rule or ...
- 51
2
votes
0
answers
35
views
Why do silver halide crystals in suspension, develop a surface charge
This is a question related to analog photography. Photographic films have a suspension of silver halide crystals in them, and these crystals have adsorptive properties which are used in this ...
- 21
7
votes
2
answers
498
views
For a given packing (hcp, fcc, bcc), which ions occupy the corners and which occupy the faces or centers?
I recently came across the packing of atoms in unit cells. I wanted to know if there was a way to tell where the atoms in the unit cell are just by knowing the compound and its packing (hcp, fcc, etc.)...
- 249
3
votes
0
answers
124
views
Is dehydration of cobalt(II) chloride hexahydrate dynamic equilibrium?
I know that the dehydration of cobalt(II) chloride hexahydrate is a reversible reaction, is it a dynamic equilibrium?
$$
\begin{align}
\ce{CoCl2·6H2O &<=> CoCl2·2H2O + 4 H2O}\tag{R1}\\
\ce{...
- 31
0
votes
0
answers
231
views
Determine anion radius in FCC cell
The edge length of an FCC cell is $\pu{508 pm}$. If radius of cation is $\pu{110 pm}$, the radius of anion is?
My approach:
$$(2R_{\text{cation}}+2R_{\text{anion}})^2=2a^2$$
Which on simplification ...
- 107
1
vote
1
answer
353
views
Adsorption on solids - homogeneous/heterogeneous surface definition
How could we define homogeneous and heterogeneous surfaces (rigorously)?
It is among my exam questions (but I could not find any definition in my textbook or on the internet).
I would say the ...
user76255
3
votes
1
answer
101
views
What is the maximum length of peptide which considered to be hard for synthesis by the current technology?
I am a molecular biologist and work with recombinant proteins. I am wondering what the cut point, in terms of length, is at which I should produce the peptide using heterologous expression rather than ...
- 59
-1
votes
1
answer
817
views
How many 4th nearest neighbours are there in an hcp lattice?
My teacher told us that there are 18 4th nearest neighbors in an hcp lattice, at a distance of √3a . I have only been able to identify 12.
Can you help me find all the 4th nearest neighbors?
- 25
0
votes
0
answers
36
views
Why do we have to use octahedral voids for formula making in solid state chemistry?
Allow me to take an example to explain myself.
Q) What is the formula of a compound in which the element Y forms a ccp lattice and an atom of X occupy ${1\over3}$rd of tetrahedral voids?
Now to find ...
- 167
6
votes
0
answers
97
views
Correct Definition of Absolute Electrode Potential
I thought absolute electrode potential is Galvani potential difference at the interface. However, it is given by following equation in John Bockris - Modern Electrochemistry (Ref.1): $$ E^M \mathrm{(...
- 817
2
votes
1
answer
228
views
Understanding packing in different dimensions
In one dimension, there is only one way of packing, that is keeping the balls next to each other.
In two dimension, we can keep a line of spheres on top of another line directly or we can keep the ...
1
vote
1
answer
2k
views
Radius ratio of octahedral interstitial site in BCC lithium
Problem
Determine the minimum radius of an atom that will just fit into (a) the tetrahedral interstitial site in FCC nickel and (b) the octahedral interstitial site in BCC lithium.
Solution
(a) For ...
- 284
6
votes
1
answer
630
views
Why is cuprous oxide a p-type semiconductor?
Wikipedia — Copper(I) oxide says $\ce{Cu2O}$ has semiconducting properties without any explanation.
Nolan [1] talks about $\ce{Cu^+}$ vacancies making copper(I) oxide an extrinsic p-type semiconductor,...
- 63
1
vote
0
answers
33
views
HCP and hexagonal primitive cell [duplicate]
There are 14 types of Bravais lattices one of them is hexagonal which is just present as primitive cell ie the basis are at its corners , now when I read about hexagonal closed packing I came to know ...
- 29
7
votes
1
answer
85
views
In solid-phase peptide synthesis, why are the formation of aspartimides a problem but not "glutamides"?
I'm studying solid-phase peptide synthesis (SPPS) at the moment, and a common problem is the formation of aspartimides, which disrupt the synthetic process.
I understand how they form and why are they ...
- 71
8
votes
2
answers
3k
views
Why are there exactly 5 types of two-dimensional lattices, and what distinguishes them?
In the book Chemistry: The Central Science, they introduced the following 5 types of two-dimensional lattices:
The book said that the blue square represents the unit cell, the black dots are lattice ...
- 107
4
votes
0
answers
43
views
Bond formations in doping of semiconductors [duplicate]
I was reading about semiconductors and found out that semiconductors are doped with either 13th group or 15th group elements which are named p-type and n-type semiconductors, respectively. In n-type ...
- 41
1
vote
0
answers
64
views
High symmetry points and x-coordinates
Is it possible to work out the x-coordinates related to high symmetry points?
The software I'm using doesn't provide me with that, so I was wondering if there is a way to manually figure it out, as I ...
- 11
3
votes
1
answer
166
views
Cationic vacancies created when non-stoichiometric iron oxide is doped with silicon(IV) ions
Problem
It is believed that non-stoichiometric compound $\ce{F_{0.93}O}$ forms by doping of $\ce{Fe^3+}$ ions in $\ce{FeO}$ crystal by replacement of $\ce{Fe^2+}$. Calculate the number of cationic ...
- 401
6
votes
3
answers
1k
views
Why is sea salt coarse?
What makes sea salt coarser than other salt?
I have tried checking online but no one seems to discuss this. It seems that the grain of sea salt is larger, but I don't understand since the salt is ...
- 69
2
votes
0
answers
84
views
What makes up the conduction band?
Prologue/Rant about online classes
We have been taught the electron sea model to explain metallic bonding and conduction of electricity by metals. Then out of the blue, the band theory was introduced, ...
0
votes
0
answers
464
views
Unit cell of hcp structure
It is given in my book that the structure in figure-1 is the unit cell of hcp structure.
So why then is the structure in figure-2 not the unit cell as we can repeat the structure in figure-2 to get ...
- 159
2
votes
1
answer
251
views
Why is the disordered CuAu structure more stable at high temperatures?
I know that the disordered CuAu structure is based around FCC whereas the ordered CuAu structure is tetragonal. Why would the FCC structure be more stable at high temperatures?
For context, I was ...
user85551
4
votes
1
answer
116
views
Getting an “index” of 7 for a set of powder diffraction data
I tried to index powder diffractogram from the following problem:
A metal (of density $\pu{0.862 g cm^-3})$ gives the following powder X-ray diffraction data $(\lambda = \pu{1.5418 Å}).$
$$2\theta \...
user85551