The chemical composition of the quartz crystal is SiO2. Quartz is widely used. Generally, quartz can be used as a raw material for glass. Purple and pink quartz and agate can also be used as raw materials for carving arts and crafts. Quartz crystals not only have piezoelectric effects, but also have excellent mechanical, electrical and temperature characteristics, so they are used to design resonators, oscillators and filters.
Parameter
Property | Value |
Chemical formula | SiO2 |
Crystal structure | Hexagonal |
Lattice parameters | a=4.90Å, c=5.40Å |
Density | 2.65 g/cm3 |
Melting Point | 1750°C |
Refractive Index | n0=1.54422, ne=1.55332 |
Thermal Conductivity at 50℃/(W·m-1·K-1) | //C=10.659，⊥C=6.1864 |
Thermal Expansion/ | //C=7.97×10-6K-1, ⊥C=13.37×10-6K-1 |
Specific Heat / (J·kgm-1·K-1) | 0.188 |
Hardness (Mohs) | 7 |
Acoustic Impedance | 1.42 |
Young`s Modulus / 106psi | //C=14.1 ⊥C=11.1 |
- Quartz is a non-plastic material
- The physical and chemical properties are very stable.
- The appearance of quartz is usually white, Milky white, gray-white and translucent, and the Mohs hardness is 7.
- Insoluble in acid, slightly soluble in KOH solution.
- Quartz has the ability to penetrate ultraviolet rays and is not conductive.
- Used as raw material for glass and ceramics industry
- Flux for metallurgical industry
- Quartz crystal oscillator
- Aerospace and Aerospace Industry
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