Below are some of the specs in stock.
X-Cut Single Crystal Quartz
Y-Cut Single Crystal Quartz
Seedless Single Crystal Quartz
Seeded Single Crystal Quartz
Researchers have used the following thin and seedless single crystal quartz spec as samples for single crystal diffraction experiments.
Quartz Item #3064
50.8mm Z-cut 50um DSP Seedless
UniversityWafer, Inc. and our partners research into monitor quartz crystal characteristics results in ongoing improvements to offer
the highest reliability in your process. We recommend gold crystals for most applications. They have low contact resistance, high chemical stability. The gold electrodes crystals are best suited for low stress material coating monitoring, Such as gold, silver, copper film thickness control. Silver crystals will provide superior performance in processes with high heat loads, such as sputtering. They may also improve the deposition of oxides. Alloy crystals are recommended for optical coating with dielectric materials and for semiconductor processes with high-stress materials, Such as SiO, SiO2, MgF2, TiO2 and so on.
The following thin z-cut single crystal quartz have been used by scientists for their diffraction research.
Quartz Item #3064
50.8mm Z-cut 50um DSP Seedless, Minimum
Researchers use the Quartz Wafers as achuck for deep RIE process.
Could you ask the plant if they have any similar requests before?
All single crystal quartz should be grown from one special seed.
And the different cut type will cause the different seed location.
One type is inside the wafer names "with seed", the other type is not inside the wafers, so names "seedless".
1.AT & BT & SC etc such orientations are for many frequency control application which will be used for many electronic and space application, such as mobile phone and satellite etc 2.Z cut is for some optical application, such as some windows and lens etc. meanwhile, general speaking, the polishing designations are for reducing the electronic resistance or enlarging the optical transmittance.
Seeded and Seedless Quartz Single quartz crystal is grown from one special seed and then is divided into three zones, x/y & z zones.
Seedless means the wafers are in the pure x /y or z zone.
|566||76.2mm||ST-Cut||350μm||SSP||Ang:42°45' Seeded (WITH-SEED)|
|547||100mm||ST-Cut||350μm||SSP||Seeded Angle42°45'±15', With-Seed. ST cut.|
|2298||100mm||Z-Cut||500um||DSP||Z-Cut Seedless Wafer|
We have the following large diameter quartz crystal wafers available. All the wafers below have one primary SEMI-Std flat.
|Dia||Ori||Thickness||Pol||Brand /Grade||SEED||TTV||Top side Ra||Backside Ra||S/D|
|150 +/-0.3mm||42.75 ST-cut||500+/-20um||SSP||SAW||withseed||<10um||<1nm||GC#1000||60/40|
Our R&D is active at developing and researching from big material to process 8” quartz wafer or more.
|Cutting Angle||X/Y/Z/AT32、33、36/BT/ST42.75°-cut etc|
|ThinnestThickness||0.08mm Min||0.10mm Min||0.20mm Min||0.35mm or more|
|Orientation Flat||All available|
|Surface Type||Single Side Polished /Double Sides Polished|
|Polished side Ra||<0.5nm|
|Back Side Criteria||General is 0.2-0.5µm or as customized|
|Edge Criteria||R=0.2mm or Bullnose|
|Material Property||ECD||Better than grade 4|
|Inclusion||Better than grade II|
|Q-Value||Better than grade C|
|Wafer Surface Criteria||Particles ￠>0.3 µ m||<= 30|
|Scratch , Chipping||None|
|Defect||No edge cracks, scratches, saw marks, stains|
|Packaging||Qty/Wafer box||25pcs per box|
|AT||0.5–300 MHz||thickness shear (c-mode, slow quasi-shear)||35°15', 0° (<25 MHz)||The most common cut, developed in 1934. The plate contains the crystal's x axis and is inclined by 35°15' from the z (optic) axis. The frequency-temperature curve is a sine-shaped curve with inflection point at around 25–35 °C. Has frequency constant 1.661 MHz⋅mm. Most (estimated over 90%) of all crystals are this variant. Used for oscillators operating in wider temperature range, for range of 0.5 to 200 MHz; also used in oven-controlled oscillators. Sensitive to mechanical stresses, whether caused by external forces or by temperature gradients. Thickness-shear crystals typically operate in fundamental mode at 1–30 MHz, 3rd overtone at 30–90 MHz, and 5th overtone at 90–150 MHz; according to other source they can be made for fundamental mode operation up to 300 MHz, though that mode is usually used only to 100 MHz and according to yet another source the upper limit for fundamental frequency of the AT cut is limited to 40 MHz for small diameter blanks. Can be manufactured either as a conventional round disk, or as a strip resonator; the latter allows much smaller size. The thickness of the quartz blank is about (1.661 mm)/(frequency in MHz), with the frequency somewhat shifted by further processing. The third overtone is about 3 times the fundamental frequency; the overtones are higher than the equivalent multiple of the fundamental frequency by about 25 kHz per overtone. Crystals designed for operating in overtone modes have to be specially processed for plane parallelism and surface finish for the best performance at a given overtone frequency.|
|35°18', 0°(>10 MHz)|
|SC||0.5–200 MHz||thickness shear||35°15', 21°54'||A special cut (Stress Compensated) developed in 1974, is a double-rotated cut (35°15' and 21°54') for oven-stabilized oscillators with low phase noise and good aging characteristics. Less sensitive to mechanical stresses. Has faster warm-up speed, higher Q, better close-in phase noise, less sensitivity to spatial orientation against the vector of gravity, and less sensitivity to vibrations. Its frequency constant is 1.797 MHz⋅mm. Coupled modes are worse than the AT cut, resistance tends to be higher; much more care is required to convert between overtones. Operates at the same frequencies as the AT cut. The frequency-temperature curve is a third order downward parabola with inflection point at 95 °C and much lower temperature sensitivity than the AT cut. Suitable for OCXOs in e.g. space and GPS systems. Less available than AT cut, more difficult to manufacture; the order-of-magnitude improvement of parameters is traded for an order of magnitude tighter crystal orientation tolerances.Aging characteristics are 2 to 3 times better than of the AT cuts. Less sensitive to drive levels. Far fewer activity dips. Less sensitive to plate geometry. Requires an oven, does not operate well at ambient temperatures as the frequency rapidly falls off at lower temperatures. Has several times lower motional capacitance than the corresponding AT cut, reducing the possibility to adjust the crystal frequency by attached capacitor; this restricts usage in conventional TCXO and VCXO devices, and other applications where the frequency of the crystal has to be adjustable. The temperature coefficients for the fundamental frequency is different than for its third overtone; when the crystal is driven to operate on both frequencies simultaneously, the resulting beat frequency can be used for temperature sensing in e.g. microcomputer-compensated crystal oscillators. Sensitive to electric fields. Sensitive to air damping, to obtain optimum Q it has to be packaged in vacuum. Temperature coefficient for b-mode is −25 ppm/°C, for dual mode 80 to over 100 ppm/°C.|
|BT||0.5–200 MHz||thickness shear (b-mode, fast quasi-shear)||−49°8', 0°||A special cut, similar to AT cut, except the plate is cut at 49° from the z axis. Operates in thickness shear mode, in b-mode (fast quasi-shear). It has well known and repeatable characteristics. Has frequency constant 2.536 MHz⋅mm. Has poorer temperature characteristics than the AT cut. Due to the higher frequency constant, can be used for crystals with higher frequencies than the AT cut, up to over 50 MHz.|
|IT||thickness shear||A special cut, is a double-rotated cut with improved characteristics for oven-stabilized oscillators. Operates in thickness shear mode. The frequency-temperature curve is a third order downward parabola with inflection point at 78 °C. Rarely used. Has similar performance and properties to the SC cut, more suitable for higher temperatures.|
|FC||thickness shear||A special cut, a double-rotated cut with improved characteristics for oven-stabilized oscillators. Operates in thickness shear mode. The frequency-temperature curve is a third order downward parabola with inflection point at 52 °C. Rarely used. Employed in oven-controlled oscillators; the oven can be set to lower temperature than for the AT/IT/SC cuts, to the beginning of the flat part of the temperature-frequency curve (which is also broader than of the other cuts); when the ambient temperature reaches this region, the oven switches off and the crystal operates at the ambient temperature, while maintaining reasonable accuracy. This cut therefore combines the power saving feature of allowing relatively low oven temperature with reasonable stability at higher ambient temperatures.|
|AK||thickness shear||a double rotated cut with better temperature-frequency characteristics than AT and BT cuts and with higher tolerance to crystallographic orientation than the AT, BT, and SC cuts (by factor 50 against a standard AT cut, according to calculations). Operates in thickness-shear mode.|
|CT||300–900 kHz||face shear||38°, 0°||The frequency-temperature curve is a downward parabola.|
|DT||75–800 kHz||face shear||−52°, 0°||Similar to CT cut. The frequency-temperature curve is a downward parabola. The temperature coefficient is lower than the CT cut; where the frequency range permits, DT is preferred over CT.|
|GT||0.1–3 MHz||width-extensional||51°7'||Its temperature coefficient between −25..+75 °C is near-zero, due to cancelling effect between two modes.|
|E,5°X||50–250 kHz||longitudal||Has reasonably low temperature coefficient, widely used for low-frequency crystal filters.|
|NT||8–130 kHz||length-width flexure (bending)|
|XY,tuning fork||3–85 kHz||length-width flexure||The dominant low-frequency crystal, as it is smaller than other low-frequency cuts, less expensive, has low impedance and low Co/C1 ratio. The chief application is the 32.768 kHz RTC crystal. Its second overtone is about six times the fundamental frequency.|
|H||8–130 kHz||length-width flexure||Used extensively for wideband filters. The temperature coefficient is linear.|
|J||1–12 kHz||length-thickness flexure||J cut is made of two quartz plates bonded together, selected to produce out of phase motion for a given electrical field.|
|RT||A double rotated cut.|
|SBTC||A double rotated cut.|
|TS||A double rotated cut.|
|X 30°||A double rotated cut.|
|LC||thickness shear||11.17°/9.39°||A double rotated cut ("Linear Coefficient") with a linear temperature-frequency response; can be used as a sensor in crystal thermometers. Temperature coefficient is 35.4 ppm/°C.|
|AC||31°||Temperature-sensitive, can be used as a sensor. Single mode with steep frequency-temperature characteristics.Temperature coefficient is 20 ppm/°C.|
|NLSC||Temperature-sensitive. Temperature coefficient is about 14 ppm/°C.|
|Y||Temperature-sensitive, can be used as a sensor. Single mode with steep frequency-temperature characteristics.The plane of the plate is perpendicular to the Y axis of the crystal. Also called parallel or 30-degree. Temperature coefficient is about 90 ppm/°C.|
|X||Used in one of the first crystal oscillators in 1921 by W.G. Cady, and as a 50 kHz oscillator in the first crystal clock by Horton and Marrison in 1927. The plane of the plate is perpendicular to the X axis of the crystal. Also called perpendicular, normal, Curie, zero-angle, or ultrasonic.|