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LGS Piezoelectric Crystals

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.).

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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)

ε11

ε33

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.(10-6·K-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 Δf, %

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/cm³

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.
   α2, ×10-8/℃

-3.2

-6.8

Temp. Coef. TTO, ℃

25

23

Dielectric Constant e

4.92

27

Power flow angle F, °

0

0.5


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