Quartz melts at a temperature of 1670 °C. This high melting point is a result of the strong silicon-oxygen bonds that make up the quartz structure. Quartz is a crystalline form of silicon dioxide (SiO2), and its high melting point is indicative of its stability and resistance to heat.
The reference provided mentions that quartz can withstand temperatures up to 1000 °C without experiencing thermal shock, which is a testament to its thermal stability. However, it is important to note that this temperature is well below the actual melting point of quartz. The melting process of quartz involves breaking the strong bonds between silicon and oxygen atoms, which requires a significant amount of energy, hence the high melting temperature.
In industrial applications, such as in the production of high-quality sapphire crystals, quartz is often used in conjunction with materials like molybdenum crucibles, which have a melting point of up to 2610 °C. This combination allows for operations at temperatures generally above 2000 °C, which is still below the melting point of quartz, ensuring its structural integrity during these high-temperature processes.
The reference also discusses the use of fused quartz tubes, which are made by melting high-purity quartz crystals at a temperature of 2000 °C. While this temperature is high, it is still below the melting point of quartz, allowing for the formation of fused quartz tubes without the quartz itself melting.
In summary, quartz has a high melting point of 1670 °C due to its strong silicon-oxygen bonds. This property makes quartz highly resistant to heat and suitable for various high-temperature applications, where it maintains its structural integrity even when subjected to temperatures well above those encountered in typical industrial or laboratory settings.
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