Understanding Salt Crystal Lattice: Factors Influencing Crystal System Selection

AI Thread Summary
The discussion centers on the factors determining the crystal lattice structure of salts, highlighting that different salts can form cubic, hexagonal, or orthorhombic lattices. The primary influences on crystal formation are thermodynamics and kinetics, which dictate the stability and growth rate of different crystal forms. While cubic lattices are often observed due to their symmetry and stability, it is not universally the most stable form for all compounds. Each salt has its own optimal crystal structure based on specific conditions. The conversation also references Ostwald's rule, which suggests that less stable forms may crystallize first, indicating a preference for kinetic over thermodynamic control in some cases. Overall, the choice of crystal lattice is complex and varies depending on the specific salt being crystallized.
jd12345
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What decides that which salt will take up which crystal lattice?
Some salts have cubic lattice , some have hexagonal , some have orthorhombic - but what factor decides which crystal system the salt will take over. Most of the examples i have seen consist of cubic lattice system. Is it becasue it is the most symmetrical?
 
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jd12345 said:
What decides that which salt will take up which crystal lattice?
Some salts have cubic lattice , some have hexagonal , some have orthorhombic - but what factor decides which crystal system the salt will take over. Most of the examples i have seen consist of cubic lattice system. Is it becasue it is the most symmetrical?

It is because it is most energetically favorable or kinetically favorable. Thermodynamics and kinetics determine crystal form.
 
didnt understand that clearly. Does cubic form faster than other forms?
And why is cubic form themost stable?
 
jd12345 said:
didnt understand that clearly. Does cubic form faster than other forms?
And why is cubic form themost stable?

No, it is not a general case of cubic being the most stable. Each compound has its own "best" crystal form.
 
jd12345 said:
didnt understand that clearly. Does cubic form faster than other forms?
And why is cubic form themost stable?

I don't know if cubic forms faster than other forms or if it is more stable. It would depend on that which is being crystallized.

Read more here. Notice that Ostwald's rule states that the least stable form usually crystallizes first. That tendency is obviously under kinetic control more so than thermodynamic.
 

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