Questions tagged [lattices]
For questions about systems with a repetitive arrangement of constituents, such as a crystal lattice or Bravais lattice.
59
questions
7
votes
1
answer
378
views
Can alkaline earth chalcogenides be doped with halogens for conductivity?
Which salts, of all the binary alkaline earth chalcogenides with a 'rock-salt' structure, can be doped with halogen anions replacing some of the chalcogen, without destroying the lattice? (That is not ...
- 35
4
votes
1
answer
257
views
How to Derive the Born-Mayer Equation?
Born-Mayer Equation: $E_{P,min}=-A\frac{N_A|z_1z_2|e^2}{4\pi\varepsilon_0d}(1-\frac{d^*}{d})$
Here is where I have gotten:
$$
E_P=-A\frac{N_A|z_1z_2|e^2}{4\pi\varepsilon_0d}, E_P^*=N_AC'e^{-d/d^*}\\
$$...
- 128
0
votes
2
answers
110
views
Why does Cs2SO4 have more lattice energy that Na2SO4?
My chemistry teacher told us that $\ce{NaF}$ has a higher lattice energy than $\ce{CsF}$. He explained it by telling lattice energy is inversely proportional to size of ions added. He then mentioned ...
- 1
0
votes
1
answer
114
views
If gold does not oxidise in air, why doesn't it reform it's lattice?
It is a common fact that without oxidation, a metal can reform it's lattice with a tad bit of pressure.
Gold is often said to be non-oxidising(doesn't oxidise in ambient temperature and pressure) and ...
- 19
-4
votes
2
answers
56
views
In cubic system how many atoms arrangement exist in nature? [closed]
All websites say the answer should be 3 , however shouldn't it be four ?
Primitive
BCC
CCP
End Centered
2
votes
0
answers
81
views
Brittle Properties of Ionic Compounds? [closed]
From my understanding, ionic compounds are brittle due to the alternating cations and anions within their lattice. Hence when stress is applied, similarly charged ions will repel causing the structure ...
- 37
4
votes
1
answer
669
views
Why does KCl have FCC structure instead of BCC?
I have this table here.
\begin{array} {|r|r|}\hline \text{Radius Ratio} & \text{Coordination number} & \text{Type of Void} \\ \hline <0.155 & 2 & \text{Linear} \\ \hline 0.155-0....
-1
votes
1
answer
70
views
Explanation for the low melting point of zinc nitrate in terms of its lattice energy and electrostatic interactions?
I understand that ionic compounds tend to have higher melting points, but I was surprised to see zinc nitrate having an unusually low melting point. I tried understanding it in terms of lattice energy ...
- 1
2
votes
1
answer
126
views
Why metal hydrides have low lattice enthalpy
Lattice enthalpy is inversely proportional to the distance between the ions. And the trend of lattice enthalpies is: $\ce{MF>MCl>MBr>MI}$. But why do metal hydrides have lesser lattice ...
- 408
-2
votes
2
answers
480
views
What is the difference between alloying and doping? [closed]
When compared to doping, how is alloying different? What modifications to the structure are brought about by both of these?
-1
votes
1
answer
233
views
Lattice energy as a factor that helps determine which charge the atoms take on?
I do not quite understand the following line of reasoning:
Why does Na not form $\ce{Na^{2+}}$ ions? To obtain $\ce{Na^{2+}}$ ions, the first and second ionization energy must be applied: 496 + 4563 ...
- 369
-2
votes
1
answer
766
views
MgSO4 is soluble while BaSO4 isn't, what's the role of Lattice energy here? [closed]
I came across a question asking the reason behind
MgSO4 is soluble while BaSO4 is insoluble in H2O
Now, I know
Solubility has inverse relation with Lattice energy. While Lattice energy is more when ...
- 1
0
votes
0
answers
55
views
Data for Madelung Constants
Where can I find data for the Madelung constants for various ionic compounds? Specifically, I am looking at silicon tetrachloride, yttrium (III) chloride, zirconium (IV) oxynitrate hydrate, niobium (V)...
3
votes
1
answer
137
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 ...
- 131
-2
votes
1
answer
2k
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.
