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SiO2 Crystal  

 

Single crystal quartz wafer is an excellent substrate for microwave filters for wireless communication industries.  PHOSCTECH can provide high quality quartz wafers for both research and industries production at the lowest price.
 
 

Typical Physical Properties
Purity   Wt %
SAW grade: > 99.9     Optical grade: 99.99
Crystal Structure
Hex.     a= 4.914 Å   c = 5.405 Å
Growth Method
Hydrothermal
Hardness
7.0   Moh’s
Density
2.684   g/cm3
Melt Point
1610 o C          ( phase transition point: 573.1oC)
Specific heat
0.18 cal/gm
Thermoelectric Constant
1200 mV /o C @ 300 o C
Thermal conductivity
0.0033 cal/cm/ o C
Thermal expansion (x10-6/ oC)
a11: 13.71      a33: 7.48
Index of Refraction
1.544
Q value
Acoustic velocity, SAW
Frequency constant, BAW
Piezoelectric coupling ,
1.8 x 106 min.
3160 ( m/sec )
1661 ( kHz/mm )
K2 (%)   BAW: 0.65       SAW: 0.14       
Inclusion
IEC Grade II
Standard Quartz Wafer Specifications
Orientation
Y, X or Z cut:   Rotated to any value in the range 30o ~ 42.75o ± 5 min.
Primary flat: orientation specified by customer   ± 30 min
Secondary Flat: orientation specified by customer.
Seed: located in the center: width < 5mm, height > 66mm
Polished surface
EPI polished on one side or two sides to Ra < 10 Å
Working Area: Wafer diameter minus 3 mm
BOW: < 20 mm for 3” wafer and 30 mm for 4” wafer
No chips out on working area. In the edge, chip width < 0.5 mm
Pit and scratches: < 3 per wafer or < 20 per 100 wafers
Standard Thickness
0.5 mm ± 0.05mm          TTV < 5 mm
Standard Diameter
f 2” (50.8mm )         f 3” (76.2mm)           f 4”(100mm)           ±0.2 mm
Primary Flat : 22 ± 1.5 mm (f 3” )     32 ± 3.0 mm ( f 4” )
Secondary Flat: 10 mm ±1.5 mm
Production Capability
20,000 wafer per month

   
 

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Tel:+86-(0)591-87846955 +86-(0)591-87846952 Fax: +86-(0)591-87856157 Website:www.phosctech.com E-mail: sales@phosctech.com