Piezoelectric Material For Microphones Barium Titanate Crystal BTO Substrate
Piezoelectric material for microphones BTO substrate single crystal substrate
Barium titanate is a piezoelectric material used in microphones and other transducers.When BTO substrates are below 18℃, the phase transformation can lead to shattering of the BTO substrates. A battery thermal box must be added to the order to keep BTO substrates above 18 degrees Celsius.
Properties:
| Crystal Structure |
Tetragonal ( 4m) : 9℃ < T < 130.5 ℃ a=3.99A, c= 4.04A , |
| Growth Method | Top Seeded Solution Growth |
| Melting Point(℃) | 1600 |
| Density(g/cm3) | 6.02 |
| Dielectric Constants |
ea = 3700, ec = 135 (unclamped) ea = 2400, e c = 60 (clamped) |
| Index of Refraction |
515 nm 633 nm 800 nm no 2.4921 2.4160 2.3681 ne 2.4247 2.3630 2.3235 |
| Transmission Wavelength | 0.45 ~ 6.30 mm |
| Electro Optic Coefficients |
rT 13 = 11.7 ?1.9 pm/V rT 33 =112 ?10 pm/V rT 42= 1920 ?180 pm/V |
|
Reflectivity of SPPC ( at 0 deg. cut ) |
50 - 70 % ( max. 77% ) for l = 515 nm 50 - 80 % ( max: 86.8%) for l = 633 nm |
| Two-wave Mixing Coupling Constant | 10 -40 cm-1 |
| Absorption Loss |
l: 515 nm 633 nm 800 nm a: 3.392cm-1 0.268cm-1 0.005cm-1 |
Advantage:
1.Excellent photorefractive properties
2.High reflectivity of self-pumped phase conjugation
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