The cutting of crystal axis by quartz wafer is called the cutting mode of quartz wafer. Due to the anisotropy of quartz crystal, the electrical and thermal properties of different cut quartz chips are different because of their elastic properties, piezoelectric properties and temperature properties. The following figure shows the positions of various cutting patterns: (1) the cut symbol indicates: There are two ways to express the cut symbol of quartz single crystal, one is the symbol representation stipulated by ire standard, the other is the customary symbol representation peculiar to quartz single crystal. The cut symbols specified by ire are represented by a set of letters (xyzlwt) and angles, the thickness and length of the wafer along the original direction of the coordinate axis are represented by the sequence of three letters in XYZ, the direction of rotation is represented by T (thickness), l (length) and w (width), and the positive sign of the angle is represented by anticlockwise rotation and the negative sign is represented by clockwise rotation. Example: (YXL) 35 ° original wafer angle: Y direction Original wafer length: X direction Rotate 35 ° anticlockwise around the length direction (x axis) to get the cutting direction of the wafer, (xytl) 5 ° / - 50 ° thickness t (x axis) 5 ° anticlockwise, and then rotate 50 ° clockwise around the length L (Y axis), which is the cutting direction of the quartz wafer. The customary symbols of quartz single crystal are mostly expressed in two English capital letters. For example, the customary symbols of (YXL) 35 ° cut type are expressed in at, and (xytl) 5 ° / - 50 ° are expressed in NT. (2) common quartz single crystal cutting type: Cutting Type (Orientation)Vibration ModeFrequency RangeShape (XYt) 0°~5°X0°~5°thickness bending2~50KHzrod (XYt) -18°30′X-18°30′length extension50~500KHzlong sheet (XYtl) 5°/-50°NTplane bending16~100KHzlong sheet (YXl) 35°ATthickness shear500KHz~350MHzdisc (rectangular sheet) (YXl) -49°BTthickness shear3MHz~75MHzdisc (rectangular sheet) (YXl) 37°~38°CTplane shear200KHz~1000KHzsquare sheet (rectangular sheet) (YXl) -52°~-53°CTplane shear100KHz~600KHzsquare sheet (rectangular sheet)