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CTGS Piezoelectric Crystal

Ca3TaGa3Si2O14 (CTGS)crystal possessing the same structure as langasite crystal (LGS) , has been reported to be a promising new piezoelectric material for fabrication of surface acoustic wave (SAW) and bulk acoustic wave (BAW) devices. Different from LGS, CTGS has an order structure, that mean its compositions and properties are homogeneous inside of the whole crystal, which is helpful for its applications.
Basic Properties
CTGS crystal possesses good piezoelectric properties and high thermal stability.  Some properties are shown in Table 1.
Table 1 Dielectric, piezoelectric and elastic properties of CTGS and LGS

Table 1 Dielectric, piezoelectric and elastic properties of CTGS and LGS 

Crystal

Relative

Dielectric Constant

Piezoelectric Constant

(pC/N)

Elastic Stiffness(1011 Pa)

ε11

ε33

d11

d14

c11

c12

c13

c14

C33

C44

CTGS

18.15

23.74

-4.58

10.43

1.232

0.330

0.448

0.004

1.781

0.409

LGS

18.96

50.19

5.66

-5.48

1.898

1.058

1.022

0.144

2.626

0.535

     Table 2 SAW properties of CTGS and LGS

Properties

LGS

CTGS

Density, g/cm3

5.746

4.66

SAW Velocity Vef, m/s

(Y-Cut)

2350

(Y-Cut)

2774

Electromechanical coupling factor 

K2emc, %(SAW)

0.3~0.38

0.322

Dielectric Constant e

19.62

16.7


   

 

 

 

X Direction

540 mm

Y Direction 

540 mm

Z Direction

40 mm

Direction Precision

±20¢

 

Diameter

514 mm

Frequency

2.721 MHz

Direction Precision

±20¢

Surface Roughness (Lapped)

Ra0.30.5 mm

Other sizes reflected in customer specifications

 
 

 

Diameter

6~50.8 mm

Thickness

0.130.5 mm

Reference Flat

2~15 mm

Surface Roughness

(Polished)

Ra1 nm

Orientation

reflected in customer specifications

Other sizes reflected in customer specifications

 

 

 

VCSA_43Cb0s1T/