Detailed below are typical specifications for single crystal cultured quartz multi-high lumbered bar quartz, grown on Z-plate seeds and lumbered into several uniformly dimensioned bars.
Section drawing
The individual as-grown crystals are crystallographically oriented and lumbered with several cuts in the YZ plane; thus producing equal sized lumbered bars, as shown below. In this process, the “top”, “centre” and “bottom” bars differ slightly in that while the centre bars are pure-Z material, both the top (+X direction) and bottom (-X direction) bars contain a small quantity of +X or -X material, respectively.
This non-Z material is, in all cases, limited to a thickness not to exceed 2.0 mm. Seed material in tops, centres and bottoms is centred in the Z direction within a 3.0 mm wide band.
Typical Specifications
Mechanical Characteristics
| Description | Units | Typical Values | Tolerance | |
|---|---|---|---|---|
| mm | X-height x Z-width | mm | 10.0 x 20.0 | ± 0.13 |
| mm | 9.0 x 18.0 | ± 0.013 | ||
| Y-length | mm | 200 | ± 5 | |
| Orientation of X-surface | @ Y-axis | degrees | 0 | ± 15 minutes |
| @ Z-axis | degrees | 0 | ± 15 minutes | |
| Orientation of Z-surface | @ X-axis | degrees | 0 | ± 1 degree |
| @ Y-axis | degrees | 0 | ± 1 degree | |
| Flatness of -X lumbered surface | mm | Flat | ± 0.1 | |
| Flat surface finish of -X lumbered surface, Ra | µm | 4.0 | maximum |
Material Characteristics
| Handedness | Right | |||
|---|---|---|---|---|
| Infrared a (3500 cm-1) | α – units | Grade B: 0.045 | maximum | |
| Grade II | Grade I | |||
| Inclusions (diameter) 25 – 75 µm | cm³ | 5 | 4 | maximum |
| Inclusions (diameter) 75 – 100 µm | cm³ | 4 | 2 | maximum |
| Inclusions (diameter) >100 µm | cm³ | 3 | 2 | maximum |
| Etch Channels | cm² | Grade 4: 300 | maximum | |
| Twins and Cracks in useful volume | Count | None |
Seed Characteristics
| Seed centricity | Within central 3mm | |
| Non-Z material | +X growth | 2.0 mm maximum |
| -X growth | 2.0 mm maximum |
Marking and Packaging
- Supplier logo, grind lot number, part number and “Minus X” are marked on the minus-X surface of each bar.
- Bars are packed in individual cells within double walled cardboard boxes containing approximately 25kg.
- Total piece count net weight, gross weight and part number are marked on the exterior of the carton.
- Cartons are appropriately marked for export purposes and affixed to wooden pallets suitable for ocean transport.
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.
