Hangzhou Freqcontrol Electronic Technology Ltd.
Hangzhou Freqcontrol Electronic Technology Ltd. We Grow Crystal. We Fabricate Wafer. We are Piezoelectric Specialist.
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3 inch Seedless Single Crystal Quartz Wafer AT-Cut Frequency Control piezo wafer
The Quartz, a very important piezoelectric material, is raw material for making quartz crystal resonators. Its main feature is that its atoms or molecules are arranged regularly, which reflects the symmetry of the shape on a macroscopic scale. Under the action of an electric field, the crystal generates stress and deforms, thereby generating mechanical vibration and obtaining a specific frequency. Quartz crystal resonators are manufactured by using its inverse piezoelectric effect characteristics.
| Single Crystal Quartz Material Properties | |
| Purity | Optical grade: 99.99% |
| Crystal Structure and lattice parameters | Hexagonal a= 4.914 Å c = 5.405 Å |
| Growth Method | Hydrothermal method |
| Hardness | 7.0 Mohs |
| Density | 2.684 g/cm3 |
| Melt Point | 1610 deg C (phase transition point: 573.1 °C) |
| Specific heat | 0.18 cal/g |
| Thermoelectric Constant | 1200 mV / °C @ 300 °C |
| Thermal conductivity | 0.0033 cal/cm/ °C |
| Thermal expansion coefficient, (CTE) (x10^-6/ K) | perpendicular to Z axis: 13.71 parallel to Z axis: 7.48 |
| Refractive Index | 1.544 |
| Q value Acoustic velocity, SAW Frequency constant, BAW Piezoelectric coupling, | 1.8 x 10^6; 2.4 x 10^6, 3.0 x 10^6 3160 ( m/sec ) 1661 ( kHz/mm ) K2 (%) BAW: 0.65 SAW: 0.14 |
| Inclusion | IEC Grade II |
| Diameter | 3”(76.2mm) | 4”(100mm) | 6”(150mm) | 8”(200mm) |
| Thickness | 0.08mm Min-up | 0.10mm Min-up | 0.20mm Min -up | 0.35mm Min- |
| Primary Flat | 22mm | 32mm | 42.5mm | 57.5mm or notch |
| Surface | LTV (5mmx5mm) | <1.5µm | TTV | <1.5~3 µm |
| Bow | -30<bow<30 | Warp | <40µm | |
| Surface Type | SSP / DSP | Edge Criteria | R=0.2mm or Bullnose | |
| Polished side Ra | <0.5nm or per requested | Back Side Criteria | 0.2-0.5µm or as customized |
FAQs:
A: We look at ourselves as the piezo wafer specialist. We are the very first to work with Single Crystal Quartz in China about 30 years ago. Then gradually we step in the field of LiNbO3, LiTaO3, Quartz glass, LGS, CTGS etc. Especially, if you are looking for a piezo quartz supplier, we are the ultimate choice! We export millions of quartz blanks each year because we master the AT, SC and IT cuts with superior angle precision.
A: Yes, of course. We can fabricate as per your request. In addition, we are so experienced with piezo wafers that we can provide you relevant suggestions if you are not 100% sure about your choice. Besides, we do have some standard wafers in stock, please check with us.
A: Yes, we would suggest you go with the courier agent you are most familiar with (DHL, FedEX, UPS etc.). We can ship via your account. And, of course, we will pack the products safely in acceptable size to help you save the shipping cost. If you need us to take care of the freight, it’s also not a problem. We also have good discount with the international courier companies.
A: The wafer products are fragile and sometimes expensive. The last thing, as the manufacturer, we want to see is the products we make were damaged during courier. As a result, we will pack the wafers adequately and put them in a proper carton filled with buffer sponge. However, accidents are inevitable sometimes. So, please follow the “Acceptance check” steps shown in the drawings below. If the unwanted happened, we will either give the replenishment or refund if you follow the checking steps.
A: Sure. Factory inspection is important for large quantity purchase and long-term cooperation. Face to face discussion is what we mostly confident with. During the past years, big names around the world have witnessed our progress in factory build-up. These days, due to the Covid-19 pandemic, we also had the experience of videoconferencing with global buyers.
Acceptance Check