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LGS Piezoelectric Single Crystals Higher Electromechanical Coupling Factor Than Quartz

    Buy cheap LGS Piezoelectric Single Crystals Higher Electromechanical Coupling Factor Than Quartz from wholesalers
     
    Buy cheap LGS Piezoelectric Single Crystals Higher Electromechanical Coupling Factor Than Quartz from wholesalers
    • Buy cheap LGS Piezoelectric Single Crystals Higher Electromechanical Coupling Factor Than Quartz from wholesalers

    LGS Piezoelectric Single Crystals Higher Electromechanical Coupling Factor Than Quartz

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    Brand Name : CRYLINK
    Certification : Iso9001
    Price : negotiation
    Delivery Time : 3-4 weeks
    Payment Terms : TT
    Supply Ability : 100 pieces /month
    Model Number : CRYLINK-LGS Crystal
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    LGS Piezoelectric Single Crystals Higher Electromechanical Coupling Factor Than Quartz

    Product Details
    Langastie crystal (La3Ga5SiO14, LGS), belonging to the space group P321, point group 32, has been reported to be promising new piezoelectric materials for fabrication of surface acoustic wave (SAW), bulk acoustic wave (BAW) devices and sensors(pressure sensor, acceleration sensor, QCM,etc.). It is reported that devices made of langasite crystal could be used at a high temperature up to 900°C because of its high thermal stability.

    Basic Properties
    Langasite crystal possesses some great properties, such as higher electromechanical coupling factor than quartz, no phase transition from room temperature to melt point. Some properties of langasite crystal are shown in Table 1 and Table 2.
    With the rapid development of the communication technology, the new generation communication system enables people not only to talk, but also to transmit image, data and video. Langasite crystal possesses high SAW properties compared with quartz, which make it to be the most competitive material in this field. SAW properties of langasite and quartz are listed in the Table 3.


    Products Information

    Diameter

    10~100 mm

    Thickness

    0.13~0.5 mm

    First Reference Flat

    15.0 mm

    Second Reference Flat

    8.0 mm

    Surface Roughness
    (Polished)

    Ra≤1 nm

    Orientation

    following customer specifications

    Other sizes reflected in customer specifications

    Table 1 Dielectric, piezoelectric, elastic stiffness constants and their first order temperature coefficients of langasite crystal

    Constant

    Relative
    Dielectric Constant

    Piezoelectric Constant
    pC/N)

    Elastic Stiffness(1011 Pa)

    11

    33

    d11

    d14

    c11

    c12

    c13

    c14

    C33

    C44

    Value

    18.96

    50.19

    5.66

    -5.48

    1.898

    1.058

    1.022

    0.144

    2.626

    0.535

    First Order Temp. Coef.(10-6K-1)

    150

    -760

    329

    -342

    -66

    204

    -75

    -335

    -94

    -63

    Table 2 Comparative properties of piezoelectric crystals

    Properties Crystal

    Quartz SiO2

    Langasite
    La3Ga5SiO14

    Lithium tetraborate Li2B4O7

    Lithium tantalate LiTaO3

    Electromechanical Coupling Factor K, %(BAW)

    7.0

    15.8

    24.0

    47.0

    Frequency Spacing f, %

    0.25

    0.90

    4.00

    7.00

    Q-Factor Q, ×103

    100

    50

    10

    2

    Temperature Frequency Coefficient
    TFC,×10-6/℃

    0.5

    1.6

    6.0

    4.0

    Table 3 SAW properties of langasite and Quartz

    Properties Crystal

    Quartz (SiO2)

    Langasite (La3Ga5SiO14)

    Density, g/cm

    2.65

    5.746

    SAW Velocity Vef, m/s

    (0°, 132.75°, 0°)
    3157

    (0°, 140°, 25°)
    2756

    Electromechanical coupling factor K2emc, %(SAW)

    0.14

    0.36

    Second order temp. coef.
    2, ×10-8/℃

    -3.2

    -6.8

    Temp. Coef. TTO, ℃

    25

    23

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