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Ultra-silicon is prepared by the process of
- a)zone-refining
- b)sublimation
- c)crystallisation
- d)fractional distillation
Correct answer is option 'A'. Can you explain this answer?
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Ultra-silicon is prepared by the process ofa)zone-refiningb)sublimatio...
Ultra Pure Silicon is prepared by Zone refining. Zone Refining is based on the difference in solubility of impurities in molten and solid state of the metal. This technique is used for obtaining metals of very high imputity.
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Ultra-silicon is prepared by the process ofa)zone-refiningb)sublimatio...
Explanation:
Ultra-silicon is a highly purified form of silicon, which is used in the semiconductor industry. It is prepared by the process of zone-refining. This process involves the following steps:
1. Preparation of a silicon rod: The first step in the process is to prepare a silicon rod of high purity. This is done by melting the silicon and then solidifying it into a rod.
2. Placing the rod in a furnace: The silicon rod is then placed in a furnace that has a temperature gradient. The temperature at one end of the furnace is higher than the temperature at the other end.
3. Melting the silicon: The silicon rod is melted by heating it with a high-frequency current. The melted silicon starts to move towards the cooler end of the furnace.
4. Formation of a molten zone: As the melted silicon moves towards the cooler end of the furnace, it forms a molten zone.
5. Moving the molten zone: The molten zone is moved slowly towards the cooler end of the furnace, and as it moves, impurities in the silicon are left behind. This process is repeated several times until the silicon is highly purified.
6. Solidification of the purified silicon: Once the silicon has been purified, it is allowed to solidify into a rod.
The zone-refining process is a highly effective way of purifying silicon. It can produce silicon with a purity of up to 99.9999%. This level of purity is essential for the semiconductor industry, where even small amounts of impurities can affect the performance of electronic devices.
Ultra-silicon is a highly purified form of silicon, which is used in the semiconductor industry. It is prepared by the process of zone-refining. This process involves the following steps:
1. Preparation of a silicon rod: The first step in the process is to prepare a silicon rod of high purity. This is done by melting the silicon and then solidifying it into a rod.
2. Placing the rod in a furnace: The silicon rod is then placed in a furnace that has a temperature gradient. The temperature at one end of the furnace is higher than the temperature at the other end.
3. Melting the silicon: The silicon rod is melted by heating it with a high-frequency current. The melted silicon starts to move towards the cooler end of the furnace.
4. Formation of a molten zone: As the melted silicon moves towards the cooler end of the furnace, it forms a molten zone.
5. Moving the molten zone: The molten zone is moved slowly towards the cooler end of the furnace, and as it moves, impurities in the silicon are left behind. This process is repeated several times until the silicon is highly purified.
6. Solidification of the purified silicon: Once the silicon has been purified, it is allowed to solidify into a rod.
The zone-refining process is a highly effective way of purifying silicon. It can produce silicon with a purity of up to 99.9999%. This level of purity is essential for the semiconductor industry, where even small amounts of impurities can affect the performance of electronic devices.
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Ultra-silicon is prepared by the process ofa)zone-refiningb)sublimationc)crystallisationd)fractional distillationCorrect answer is option 'A'. Can you explain this answer?
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