Pure Z Quartz For Mechanical Processing
Section drawing
These crystals are suitable for lumbering into multiple bars for AT-cut blanks or for lumbering into single pure-Z bars for further fabrication using mechanical wafer processing techniques.
Typical Specifications
Mechanical Characteristics
| Description | Units | Typical Values | Tolerance |
|---|---|---|---|
| Zeff | mm | 22 or 38 | ± 4 |
| Distribution of Zeff | Customer specified | ||
| X | mm | Xseed +15 | ± 2 |
| Y | mm | 165, 175 or 200 | ± 3 |
| Centricity of seed [Z1 – Z2] | mm | 1.0 | maximum |
| Z taper in useful volume [Zmax – Zmin] | mm | 1.5 | maximum |
| A | mm | >Xseed | |
| Cracks in useful volume | count | >none | |
| Condition of -X surface | qualitative | >smooth |
Material Characteristics
| Description | Units | Typical Values | Tolerance | ||
|---|---|---|---|---|---|
| Handedness | Right | ||||
| Twins in useful volume | Count | None | |||
| Infrared a (3500 cm-1) | α – units | Grade B: 0.045 | maximum | ||
| Grade C: 0.060 | maximum | ||||
| Grade II | Grade I | ||||
| Inclusions (diameter) | 25 – 75 µm | cm³ | 5 | 4 | maximum |
| 75 – 100 µm | cm³ | 4 | 2 | maximum | |
| Inclusions (diameter) | >100 µm | cm³ | 3 | 2 | maximum |
| Etch Channels | cm² | Grade 4: 300 | maximum | ||
| Filaments | Qualitative | 150 | maximum |
Seed Characteristics
End chamfer [Xseed – Xseed minmm2.0-maximum
| Description | Units | Typical Values | Tolerance |
|---|---|---|---|
| Xseed | mm | 39.0, 54.0 or 65.0 | -0.0 +0.5 |
| Z | mm | 2.0 | -0.5 +0.2 |
| Orientation of Z-surfaces @ X-axis | arc minutes | 0 | ± 15 |
| Orientation of Z-surfaces @ Y-axis | arc minutes | 0 | ± 30 |
| Orientation of X-surfaces @ Z-axis | arc minutes | 0 | ± 15 |
Marking Requirements
- Location: -X surface
- Information: Batch, supplier identification, and orientation (Z-surfaces around X-axis)
- Method: Ink Stamp
Packaging Requirements
- Bars are classified into 1 mm groups based on Zeff Each carton contains only bars within one size group.
- Bars are packed in individual cells within double wall cardboard boxes containing approximately 25 kg.
- The size group and batches contained are marked on the exterior of the carton.
- Cartons are appropriately marked for export purposes and firmly affixed to wooden pallets suitable for sea shipment.
References
International Electrotechnical Commission Standard, CEI/IEC 758, Second edition, 1993-04.
Institute of Electrical and Electronic Engineers Standard on Piezoelectricity, ANSI/IEEE Std. 176-1987.
