BaTiO3  Single  Crystal

        Barium Titanate single crystal is an excellent photorefractive material which has high SPPC (Self pumped Phase Conjugation) reflection and two wave mixing (optical amplification) efficiency, It is important for information processing and image storage. Besides that it is also an important substrate material for some special film as its unique ferroelectric and other properties.

    The followings are important for the use of BaTiO3, both for the bulk device and substrate:

1.The tetragonal BaTiO3 single crystal (the useful phase for both photorefractive effect and substrate) will change the phase when its temperature is lower than 13℃ or higher 125℃, so it is necessary to keep its temperature in the safe range during its using, storage and transportation.

2.The extra force such as compacting, cracking will cause a phase transition.

3.Poling is needed for (001)orientation substrate, while is not necessary for （100）、（110）、（111）orientations.

4.Normally the maximum size for BaTiO3 substrate is 10x10mm; the thinnest thickness is 0.3mm.

　

BaTiO3 in growing

Boules

Finished Products

Typical  Properties:

Crystal Structure

 Tetragonal(4m)    13oC<T<132 oC

Cell parameter

a=3.99Å,c=4.04Å,(at 26 oC)

Melting Point

 1891 oK  

Density

 6.06 g/cm3 (at 26 oC)

Specific Heat

0.527J/g·k(300°K)
Thermal conductivity

6 W/m·k(300°K)

Thermal expansion

(10-6k-1）

15.7∥a  6.2∥c
Dielectric constant（εr）

εa=3000   εc=800
Hardness（Mohs）

4.5
Growth Method

TSSG(Top Seeded Solution Growth)

Index of Refraction  

515 nm

633 nm

800 nm

 no

2.4912

2.4160

2.3681

 ne 

2.4247

2.3630

2.3235  

Transmission wavelength 

 0.43 - 6.30 um

Electro Optic Coefficients

rT13=8+/-2 pm/V  

  rT33=105+/-10 pm/V

 rT42= 1300+/-100 pm/V

Reflectivity of SPPC

( at 0 deg. cut )

50-70 % (Ce: BaTiO3) for lamda = 515 nm

40-60% (PureBaTiO3) for lamda = 515 nm

50-80 % (Ce: BaTiO3) for lamda = 633 nm

40-60%  (PureBaTiO3) for lamda = 633 nm

Two-wave mixing coupling constant

10-40  cm-1

Absorption loss

Lamda:      515 nm          633 nm          800 nm

 a:         0.285cm-1        0.108cm-1         0.033cm-1

Wavelength range for photo refractive effect

Undoped BTO :for visible

Ce:BTO:480-780nm

Rh:BTO:720-1060nm

Specifications

Standard Size: 10x10，10x5，10x3,5x5 mm,

Thickness: 0.5mm，1.0mm. 

Polishing: one or two side polished

Bulk:      5x5x5,4x4x4,3x3x3 mm, 0°or 45°cut,2-6 faces polished

Orientation：＜100＞,  ＜110＞,  ＜001＞, ＜111＞

Orientation accuracy:  ±0.5°

　

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