.

Quartz Materials

Quartz Materials

Hydrothermal Growth of Quartz:

CQT supply piezo single crystal blanks, which include quartz materials and quartz blanks. We has been servicing for microelectronic manufacturers, defense related contractors, National laboratories, universities and scientists around the world since 1990

Product Parameters

  1. Physical properties of synthetic crystal quartz

Density, g/cm3

Melting point, °C

1467

Thermal conductivity, W/(mxK) (T=25°C)

Thermal coefficient of linear expansion at temperature range 0-25°Ñ, °C-1

Hardness (Mohs)

7

Specific heat capacity, J/(kgxK) (T=25°C)

710

Dielectric constant at 30 MHz

Young's modulus (E), GPa

Shear modulus (G), GPa

Bulk modulus (K), GPa

Chemical stability

insoluble in water

Elastic coefficients

C11=87 C12=7 C44=58 C13=13 C14=18 C33=106

More details about finished crystals, saw filters, quartz blanks process flow and fused silica wafers, please contact us.

Our company export quartz blanks, LN waferand LT wafer

l, mm

n0

ne

l, mm

n0

ne

l, mm

n0

ne

3

a) 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.

b) 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.

a) Twinning: There shall be no electrical or optical twinning in the usable region.

b) Strain: There shall be no strain contained both inside and surface of seed crystal as well as in a grown quartz crystal.

c) Cracks and fractures: There shall be no cracks, chippings or fractures in the usable region.

d) Inclusion density: The specification is in accordance with the IEC 60758.

Size range

Qty per cm3

Grade (µm)

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

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

Grade

Estimated Q values (x 106)

A

A

3

B

C

D

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

Grade

1

10

2

30

3

100

4

300

5

600

a) Angles:

b) Dimensional tolerance:

c)Surface roughness: as customized, lapped and polished are both available.



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