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| Home » Quartz » Doubly Rotated Quartz Blanks » Request Quote | Search Roditi |
Doubly Rotated Blanks are single crystal cultured quartz
blanks fabricated with a double
angular rotation suitable for
operation in the thickness shear
mode. This family of blanks includes
the SC-cut and IT-cut and is designed
to reduce the effects of stress
on resonant frequency.
| Doubly rotated blanks can be fabricated to a range of specifications for either of the two angles of rotation as well as the overall blank dimensions. Typical specifications for the j -rotation (i.e. the first, or X to X', rotation) are around 22° for SC-cut blanks and 19° for IT-cuts, but can vary by as much as ±10. The q -rotation (i.e. the second, or Z to Z' rotation) typically ranges from 33° to 35°. Verification of specified orientation is assured by providing us with the appropriate x-ray diffraction reference standards. As the blanks are usually angle corrected after delivery, both surfaces are lapped to a rough finish using 15 µm abrasive, unless otherwise specified | Section Drawing |
| Units | Typical
Values |
Tolerance |
|
| X-height x Z-width | mm |
16.5
x 16.5 |
± 0.25 |
| Thickness, t | As
specified |
± 0.013 |
|
| Orientation - φ | degrees |
As
specified (18°-24°) |
± 10 minutes |
| Orientation - θ | degrees |
As
specified (33±-35°) |
± 5 minutes |
| Standard dimensions (other dimensions are available to meet customer-specific requirements) | |||
| Handedness | Right |
|||
| Infrared a (3500 cm-1) | α - units |
Grade
B: 0.045 |
maximum |
|
Grade
l |
||||
| Inclusions (diameter) | 25
- 75 µm |
cm3 |
4 |
|
75
- 100 µm |
cm3 |
2 |
||
>100
µm |
cm3 |
2 |
||
| Etch Channels | cm2 |
Grade
4: 300 |
maximum |
|
| Twins in useful volume | Count |
None |
||
Pure - Z, seed free material
International Electrotechnical Commission Standard, CEI/IEC 758, Second edition, 1994.
Institute of Electrical and Electronic Engineers Standard on Piezoelectricity, ANSI/IEEE Std. 176-1 987.
Reproduced by kind permission of Sawyer Research Products, Inc.© Sawyer Research Products, Inc. Specifications subject to change without notice.All rights reserved
Roditi International 2007