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Questions and Answers
What is the primary temperature range for crystallization in the slow cooling method?
What is the primary temperature range for crystallization in the slow cooling method?
- 25 C to 45 C
- 0 C to 25 C
- 75 C to 100 C
- 45 C to 75 C (correct)
Which of the following methods supports the growth of prismatic crystals?
Which of the following methods supports the growth of prismatic crystals?
- Rapid cooling method
- Slow evaporation method (correct)
- Pressure method
- High temperature solution method
What is a significant advantage of low temperature solution growth?
What is a significant advantage of low temperature solution growth?
- It requires higher temperatures for crystallization
- It produces only small-sized crystals
- It allows for the growth of dislocation-free crystals (correct)
- It guarantees rapid crystal growth
What is the main characteristic of the materials suitable for low temperature solution growth?
What is the main characteristic of the materials suitable for low temperature solution growth?
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How does a variable rate of evaporation affect crystal quality in the slow evaporation method?
How does a variable rate of evaporation affect crystal quality in the slow evaporation method?
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Study Notes
Solution Growth
- Solution growth is a simple method to grow many crystalline materials, especially those highly soluble.
- Low temperature solution growth is suitable for materials that decompose at high temperatures and undergo phase transformations below their melting point.
- Two methods of low temperature solution growth are slow cooling and slow evaporation.
- Slow evaporation is a simple and convenient method for growing large single crystals.
- Slow evaporation can produce strain and dislocation-free crystals.
- Slow evaporation can create prismatic crystals by adjusting growth conditions.
- Slow evaporation is the only method for substances that decompose before melting.
- Varying evaporation rates can affect crystal quality.
Slow Cooling Method
- Slow cooling is the easiest method for growing bulk single crystals from solution.
- Only a vessel containing the solution is required for crystal growth.
- Crystallization typically begins between 45°C and 75°C.
- The lower limit of cooling is room temperature.
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