Crystal

Structure           (A)                               

M.P. ^oC

Density
g/cm³

Lattice Mis-match to GaN

Thermo Expan
(10^-6/k)

GrowthTech. & Max.size

Al₂O₃

Hexagonal a=4.758 c=12.99

2030

3.97

14%

7.50

CZ  4"

LiAlO₂

Tetragonal  a=5.17 c=6.26

1900

2.62

1.4 %

/

CZ , 2"

LiGaO₂

Orthor.a=5.406 b=5.012  c=6.379

1600

4.18

0.2 %

/

CZ  20 mm

LSAT

Cubic,   a=3.868

1840

6.74

< 1%

10

CZ , 2"

MgAl₂O₄

Cubic a=8.083

2130

3.60

9% 

7.45

CZ  2"

SiC (6H)

Hexag. a=3.080 c=15.12

~2700 subl.

3.217

3.5%

10.3

CVD 50 mm

ZnO

Hexag. a=3.325 c=5.213

1975

5.605

2.2 %

2.90

Hydro-thermal  20mm

GaN

Hexag. a=3.189 c=5.185

~2500 subl.

6.15

0%

α_c = 3.17

HVPE