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Questions tagged [lattices]

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Need to normalize lattice enthalpy by no. of nearest-neighbor (NN) interactions to equate to NN interaction strength?

I've seen electrostatic interaction energy (from $E\sim \frac{q_1 q_2}{r}$) used to explain differences in lattice enthalpies between different crystalline solids. For example, I've seen it explained ...
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Difference in properties of water as ligand vs 'in lattice'

I'm trying to understand the difference in properties between water in crystals in different positions in the lattice. In this wikipedia article It quotes: Both notations can be combined as for ...
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Relation between size and lattice energy

I came across the statement “BeO and MgO have high melting point because of the lattice energy of BeO and MgO is appreciably high due to their small size” in my mAterial I didn’t understand what ...
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Packing fractions of HCP and FCC

The packing fractions of hexagonal close packed unit cell and face centred cubic unit cell come out to be same when calculated geometrically. Is it just a coincidence? Differently put, could it be ...
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Electrical resistivity [closed]

I have read that in non-metals solids the electric resistivity is reduced if we increase temperature.But this isn't logical.I mean if temperature is increased ok the electrons get extra energy but as ...
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Why don't ions form crystal lattices in water and other polar solvents?

Ionic compounds are in the form of crystal lattices, and when they are dissolved in a polar solvent, they are bonded with the corresponding cations/anions of the polar solvent. For example, $Na^+$ ...
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1answer
72 views

Does a molecule need to be placed symmetrically in the unit cell?

I was watching an OCW by MIT (3.091X) on solid state. My previous notion of lattice point and unit cell got shattered after this example. Where are the unit cell and lattice points in this picture? ...
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How is the covalency of terminal carbons of a diamond satisfied? [duplicate]

Are the terminal carbons of the diamond lattice remain bonded to some element like hydrogen? Or, is it that they don't achieve octate in their outer shell?
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1answer
45 views

Is this approach to finding density in crystal lattice acceptable?

In answering a question in an elementary chemistry text that asks for the density of gold ($\ce{Au}$) based on crystal dimensions and weight per atom, I found the approach I used was a little ...
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Do two Miller planes need to have similar arrangement of atoms?

For two Miller planes, do I need to have the same arrangement of atoms in both of them? Does it need to look like the same plane translated a little? I have this question because if this is not the ...