Quartz crystal is commonly known as crystal, and its chemical composition is SiO2. It is a representative single crystal and a widely used piezoelectric crystal. It has no pyroelectric effect and no ferroelectricity. Its melting point is 1750 ℃, and its density is 2.65 103kg/m3, with a Mohs hardness of 7. Its outstanding advantages are stable performance, particularly good temperature stability of dielectric and piezoelectric coefficients. Its piezoelectric coefficient hardly changes with temperature within the room temperature range. In the range of 20-200 ℃, for every 1 ℃ increase in temperature, the piezoelectric coefficient d11 only decreases by 0.016%. At different temperatures under atmospheric pressure, the crystal structure of quartz varies. When the temperature is below 573 ℃ α Quartz crystal; When the temperature is between 573 and 870 ℃, it is β Quartz crystal; When the temperature is between 870 and 1470 ℃, it is a scale quartz; When the temperature reaches 1470 ℃, it transforms into cristobalite. the main materials used for manufacturing piezoelectric components are α Quartz crystal.

Piezoelectric quartz, also known as piezoelectric crystal. Crystal quartz refers to quartz crystals with relatively pure and transparent composition, also known as crystals. Generally colorless and transparent, if it contains micro pigment ions such as Fe, Ti, or due to differences in atomic arrangement, it can appear purple, yellow, smoke, tea, light red, light green, and other colors. The chemical composition of crystal quartz is SiO2., The general block size of quartz single crystals is required to be greater than 12 twelve 12 mm; When the ore grade of the deposit is high, the block size can be relaxed to 8x8 8 mm. When evaluating mineral deposits, the low industrial grade is: 0.5g/m3 for primary and open-pit mining, 3G/m3 for underground mining, 0.3G/m3 for sand and water mining, and 0.5g/m3 for underground mining.