Name: Piezo crystal Quartz& lumbered bars
Brand: ROHz
SKU: QLB
Availability: InStock
Rating: 5 (1 reviews)

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Description

The amount of crystal defect and impurity in synthetic quartz crystal depends on growth rate, mineralizer and raw material. The growth rate affects greatly to the important properties such as infra-red absorption coefficient α, which correlates to Q value, and frequency –temperature characteristics. The larger growth rate causes increase in α, decrease in Q value, and dispersion in frequency-temperature characteristics.
The quality index of synthetic quartz crystal was originally a Q value, and a 5 MHz quartz crystal unit operated in 5th overtone mode was used to obtain the Q value. But it required laborious work to fabricate the 5 MHz crystal unit, so the index had been changed to the coefficient α instead of the Q value

Basic materials characteristics
Density, g/cm³ :	2.65
Melting point, °C:	1467
Thermal conductivity, W/(m x K) (T = 25°C):	10.7 (parallel to axis Z)	6.2 (perpendicular to axis Z)
Hardness (Mohs):	7
Dielectric ñ onstant at 30 MHz:	4.34 (parallel to axis Z)	4.27 (perpendicular to axis Z)
Young's modulus (E), GPa:	97.2 (parallel to axis Z)	76.5 (perpendicular to axis Z)
Chemical stability:	insoluble in water

Specifications：

Twinning: There shall be no electrical or optical twinning in the usable region.
Strain: There shall be no strain contained both inside and surface of seed crystal as well as in a grown quartz crystal.
Cracks and fractures: There shall be no cracks, chippings or fractures in the usable region.
Inclusion density: The specification is in accordance with the IEC 60758.

Size range (µm) Grade	Q’ty per cm³
Size range (µm) Grade	10 to 30	30 to 70	70 to 100	>100
Ia	2	1	0	0
Ib	3	2	1	1
I	6	4	2	2
II	9	5	4	3
III	12	8	6	4

Infra-red quality indication: The specification is in accordance with the IEC 60758

Grade	Max. α3585	Estimated Q values (x 106)
A	0.015	3.8
A	0.024	3.0
B	0.050	2.4
C	0.069	1.8
D	0.100	1.4

Etch channel density: The specification is in accordance with the IEC 60758

Grade	Max. number per cm3
1	10
2	30
3	100
4	300
5	600

Running spec:

Material grade: customized per above listed quality items.
Angles: 2.1 Rotation angle of X-surface around Y-axis: <00°00’±15’；2.2 Rotation angle of X-surface around Z-axis: <00°00’±15’
Dimensional tolerance: 3.1 along X or Z axis:±0.1 mm； 3.2 along Yaxis:±10 mm
Surface finished: lapped or polished comply with customized
the biggest size we can provide now is X direction:200mm

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