| Nikko Hitech International, Inc.

Oxide Single-Crystal Substrates for Superconductor Use

Single-crystal substrates
SrTiO3, Nb:SrTiO3, Al2O3, NdGaO3, TiO2, Nb:TiO2, LaAlO3, MgO, Y:ZrO2, LSAT, MgAl2O4 (spinel).

SrTiO3 characteristics    
Crystal structure Cubic Perovskyte    
Lattice constant 0.3905 nm    
Melting temperature 2080ºC    
Density 5.122 g/cm3 (20ºC)  
Dielectric constant 310 (27ºC,1 MHz)  
Coefficient of thermal expansion 11.1×10-6 /ºC (room temperature to 1000℃)  
Phase transistion 110 K (Cubic to quadratic)  
Coefficient of refraction 2.407 (at 589 nm)  
       

Standard SrTiO3 Products   
Orientation (100), (110), (111)  
Crystal axis tolerance ±0.5º  
Dimensions 10 × 10 × 0.5 mm or 15 ×15 ×0.5 mm  
Polish Single or Double side  
     

Nb:SrTiO3 characteristics
Crystal structure Cubic Perovskyte    
Lattice constant 0.3905 nm    
Melting temperature 2080ºC    
Density 5.122 g/cm3 (20 ℃)  
Dielectric constant 310 (27 ℃,1 MHz)  
Coefficient of thermal expansion 11.1×10-6/ºC (room temperature to 1000℃)  
Phase transistion 110 K (Cubic to quadratic)  
Coefficient of refraction 2.407 (at 589 nm)  
Resistivity(Ω•cm)
(typical example)
7 – 10×10-2
3 – 7×10-3
(Nb: 0.05 wt%)
(Nb: 0.50 wt%)
 
       

Standard Nb:SrTiO3 Products  
Orientation

(100), (110), (111)

 
Crystal axis tolerance ±0.5º  
Dimensions 10 × 10 × 0.5 mm or 15 ×15 × 0.5 mm  
Polish Single or Double side  
     

Al2O3 (Sapphire) characteristics   
Crystal structure Corundum 3-directional    
Lattice constant a=0.4759 nm
c=1.299 nm
   
Melting temperature 2040ºC    
Density 3.987 g/cm3    
Dielectric constant (in c direction) 9.41 (30 GHz)  
Dielectric loss (in c direction) 3×10-5 (30 GHz)  
Pressure strength

(in a direction) 6.93×10-6/ºC
(in c direction) 7.63×10-6/ºC

(in a direction) 8.89×10-6/ºC
(in c direction) 9.97×10-6/ºC


(200ºC)


(1000ºC)

 
       

Standard Al2O3 (Sapphire) products 
  Al2O3  
Orientation (0001), (01-12), (11-20)  
Size 10 ×10 × 0.5mmt , 15 × 15 × 0.5mm
50.8 diameter × 0.325 mm, 50.8 diameter × 0.425 mm
76.2 diameter × 0.425 mm, 76.2 × 0.525 mm
 
Polish Single/Double  
     

NdGaO3 characteristics
Crystal structure Prismatic    
Lattice constant a=0.5431 nm, b=0.5499 nm, c=0.7710 nm    
Melting temperature 1650ºC    
Density 7.56 g/cm3    
Dielectric constant 20 – 25 (27ºC,1MHz)  
Coefficient of thermal expansion 10×10-6/ºC    
       

Standard NdGaO3 Products  
Orientation

(100), (001), (110)

 
Crystal axis tolerance ±0.5º  
Dimensions 10 × 10 × 0.5 mm  
Polish Single or Double side  
Roughness Ra ≤ 1.0 nm
Rmax ≤ 5.0 nm
 
Flatness

≤ λ (λ = 632.8 nm)

 
Note: NdGaO3 available in up to 2-inch diameter   
     

TiO2 Characteristics    

Crystal structure

Quadratic

   
Lattice constant a=0.459 nm
c=0.295 nm
   
Melting temperature 1840 ºC     
Density 4.252 g/cm3 (20 ºC)  
Dielectric constant 113 (1 MHz)  
Coefficient of thermal expansion (in a direction)        7.81×10-6 / ºC
(In b direction) 10.1×10-6 / ºC
(30–400 ºC)
(30–400 ºC)
 
Band gap 3.0 eV    
Coefficient of refractance no=2.5490
ne=2.8226
(at 706.5 nm)  
       

 

Standard TiO2 Products
Orientation (100)  、(110) 、 (001)  
Crystal axis tolerance ±0.5º  
Dimensions 15 × 15 × 0.5mm  
Polish Single side polish  
     

Nb:TiO2 Characteristics  

Crystal structure

Quadratic

   
Lattice constant a=0.459 nm
c=0.295 nm
   
Melting temperature 1840 ºC     
Density 4.252 g/cm3 (20 ºC)  
Dielectric constant 113 (1 MHz)  
Coefficient of thermal expansion (in a direction)        7.81×10-6 / ºC
(In b direction) 10.1×10-6 / ºC
(30–400 ºC)
(30–400 ºC)
 
Band gap 3.0 eV    
Coefficient of refractance no=2.5490
ne=2.8226
(at 706.5 nm)  
Resistivity (Ω•cm)
(typical example)
4.50
0.27
0.16
(Nb: 0.05 wt%)
(Nb: 0.50 wt%)
(Nb: 1.00 wt%)
 
       

Standard Nb:TiO2 Products  
Dopant % 0.05 wt% 
(0.04 at%)
0.50 wt%
(0.43 at%)
 
Orientation

(100)  、(110) 、 (001)

   
Crystal axis tolerance ±0.5º    
Dimensions 15 × 15 × 0.5mm    
Polish Single side polish    
       

LaAlO3 Characteristics
Crystal structure Hexagonal  
Lattice constant a=0.5364 nm
c=1.311 nm
 
Melting temperature  2100 ºC  
Density 6.52 g/cm3  
Dielectric constant 15–22 (27 ºC,1MHz)  
Coefficient of thermal expansion 12.5×10-6 / ºC  
     

Standard LaAlO3 Characteristics  
Orientation (0001)  
Crystal axis
tolerance
±0.5º  
Dimensions 10 × 10 × 0.5 mm or 15 ×15 × 0.5 mm  
Polish Single or double side  
     

LSAT (La0.3Sr0.7)(Al0.65Ta0.35)O3 Characteristics
Crystal structure Cubic  
Lattice constant a=0.7736 nm  
Melting temperature 1840ºC  
Density 6.79 g/cm3  
Dielectric constant 22 (27ºC,1MHz)  
Coefficient of thermal expansion 10×10-6 /ºC  
     

Standard LSAT (La0.3Sr0.7)(Al0.65Ta0.35)O3 Products
Orientation (100)  
Crystal axis tolerance  ±0.5º  
Dimensions 10 × 10 × 0.5 mm or 15 ×15 × 0.5 mm  
Polish Single or double side  
     

MgO Characteristics
Crystal structure Cubic halite  
Lattice constant a=0.4213 nm  
Melting temperature 2800 ºC  
Density 3.59 g/cm3  
Dielectric constant 10 (27 ºC,1MHz)  
Coefficient of thermal expansion 13.5×10-6 / ºC  
     

Standard MgO characteristics
Orientation (0001)  
Crystal axis tolerance ±0.5º  
Dimensions 10 × 10 × 0.5 mm or 15 ×15 × 0.5 mm  
Polish Single or double side  
     

YSZ (Yttria-stabilized zirconia)  
Crystal structure Cubic  
Lattice constant a=0.5139nm   
Melting temperature 2500ºC   
Density 6.05 g/cm3   
Dielectric constant  27 (27ºC,1MHz)  
Coefficient of thermal expansion  10.3×10-6 /ºC   
     

Standard YSZ (Yttria-stabilized zirconia) products
Orientation (100), (111)  
Crystal axis tolerance ±0.5º  
Dimensions 10 × 10 × 0.5 mm or 15 ×15 × 0.5 mm  
Polish Single or double side  
     

MgAl2O4 (Spinel)  
Crystal structure Cubic Spinel  
Lattice constant a=0.8083 nm  
Melting temperature 2130ºC  
Density 3.6 g/cm3  
Coefficient of thermal expansion 7.45×10-6 / ºC  
     

Standard MgAl2O4 products
Orientation (111)  
Dimensions 10 × 10 × 0.5 mm