石英材料
石英的水热生长：
- 用水加矿化剂（NaOH或Na 2 CO 3）将高压釜填充到某个预定因子。
- 挡板定位温度梯度，使每个区域几乎等温。
- 种子是（通常）Z切单晶的薄片。
- 营养素由小块（~2½到4厘米）的单晶石英（“lascas”）组成。
- 温度和压力通常为约350℃和800至2,000个大气压; T2-T1通常为40℃至100℃。
（每次运行30至260天），扩散到生长区，并沉积在种子上。
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
- Physical properties of synthetic crystal quartz
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Density, g/cm3
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Melting point, °C
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1467
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Thermal conductivity, W/(m x K) (T = 25°C)
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(parallel to axis Z) (perpendicular to axis Z)
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Thermal coefficient of linear expansion at temperature range 0-25°Ñ, °C-1
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õ 10-6 (parallel to axis Z)
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õ 10-6 (perpendicular to axis Z)
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Hardness (Mohs)
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7
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Specific heat capacity, J/(kg x K) (T = 25°C)
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710
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Dielectric constant at 30 MHz
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(parallel to axis Z) (perpendicular to axis Z)
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Young's modulus (E), GPa
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(parallel to axis Z) (perpendicular to axis Z)
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Shear modulus (G), GPa
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Bulk modulus (K), GPa
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Chemical stability
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insoluble in water
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Elastic coefficients
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C11=87 C12=7 C44=58 C13=13 C14=18 C33=106
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More details about finished crystals, saw filters, quartz blanks process flow and fused silica wafers, please contact us.
Our company export quartz blanks, LN wafer and LT wafer
crystal quartz refractive index vs wavelength
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l, mm
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n0
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ne
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l, mm
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n0
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ne
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l, mm
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n0
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ne
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3
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07
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evaluation of synthetic quartz crystal
- 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.
specification for synthetic quartz crystal
- 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.
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Size range
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Qty per cm3
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Grade (µm)
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10 to 30
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30 to 70
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70 to 100
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>100
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Ia
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2
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1
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0
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0
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Ib
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3
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2
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1
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1
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I
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6
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4
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2
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2
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II
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9
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5
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4
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3
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III
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12
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8
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6
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4
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- e) Infra-red quality indication: The specification is in accordance with the IEC 60758.
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Grade
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Max. α3585
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Estimated Q values (x 106)
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A
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A
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3
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B
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C
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D
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- f) Etch channel density: The specification is in accordance with the IEC 60758.
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Grade
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Max. number per cm3
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1
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10
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2
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30
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3
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100
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4
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300
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5
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600
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for lumbered quartz crystal
- a) Angles:
- Rotation angle of X-surface around Y-axis: 00°00’±15’
- X轴表面绕Z轴的旋转角度：00°00'±15'
- b）尺寸公差：
- 沿X或Z轴：± mm
- 沿Y轴：±10 mm
c）表面粗糙度：可定制，研磨和抛光。
