Crystals Land

  BaTiO₃ & doped BaTiO₃

Undoped and doped Barium Titanate crystals are the excellent photorefractive materials, their high Self pumped Phase Conjugation (SPPC) reflection and two wave mixing (optical amplification) efficiency, which make them important role for information processing and image storage. In addition, BaTiO₃ is an important substrate material for some special film due to its unique ferroelectric and other properties.

Physical Properties:

Structure	Tetragonal(4m) at 13oC<T<132 oC
Cell parameter	a=3.99Å,c=4.04Å,(at 26 oC)
Melting Point	1891 K
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
Mohs Hardness	4.5

 

 

 

 

 

 

Optical Properties:

Transmission wavelength	0.43 - 6.30μm
Index of Refraction		515 nm	633 nm	800 nm
	no	2.4912	2.4160	2.3681
	ne	2.4247	2.3630	2.3235
Electro Optic Coefficients	rT13=8+/-2 pm/V
	rT33=105-/+10 pm/V
	rT42=    1300+/-100 pm/V
Reflectivity of  SPPC ( 0º cut)	50-70 % (Ce: BaTiO3) for λ = 515 nm
	40-60% (Pure BaTiO3) for λ = 515 nm
	50-80 % (Ce: BaTiO3) for λ = 633 nm
	40-60% (Pure BaTiO3) for λ= 633 nm
Two-wave mixing coupling constant	10-40cm-1
Absorption loss		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＞
Angle tolerance	better than ±0.5°