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Piezoelectric Langasite La3Ga5SiO14 (LGS) Crystal, 4 inch wafers, can be customized

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Product Information: 

Formulation: La3Ga5SiO14 (LGS)

Diameter: 100 mm

Thickness: 0.35-0.5 mm

First Reference Flat: 32.0 mm

Second Reference Flat: 18.0 mm

Surface Roughness (Polished): Ra ≤ 1 nm

Surface Polish Choices: SSP or DSP.

Orientations:  xyl/48.5º/26.7º  (0º,138.5º,26.7º) or (0º,22º,90º), or following 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/℃2

-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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