Understanding Salt Crystal Lattice: Factors Influencing Crystal System Selection

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SUMMARY

The discussion centers on the factors influencing the selection of crystal lattice structures in salts, specifically cubic, hexagonal, and orthorhombic systems. It is established that thermodynamics and kinetics play crucial roles in determining the crystal form, with Ostwald's rule indicating that the least stable form typically crystallizes first. The cubic lattice is not universally the most stable; each salt has its own optimal crystal structure based on specific energetic conditions. The conversation highlights the complexity of crystallization processes and the need for a nuanced understanding of individual compounds.

PREREQUISITES
  • Understanding of thermodynamics and kinetics in crystallization
  • Familiarity with Ostwald's rule of stages
  • Knowledge of crystal lattice structures (cubic, hexagonal, orthorhombic)
  • Basic principles of crystallography
NEXT STEPS
  • Research the implications of Ostwald's rule in crystallization processes
  • Study the thermodynamic stability of different crystal forms
  • Explore the kinetics of crystallization in various salts
  • Investigate specific examples of salts and their preferred crystal lattices
USEFUL FOR

Chemists, materials scientists, and students studying crystallography or solid-state chemistry will benefit from this discussion, particularly those interested in the factors influencing crystal formation in salts.

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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