LANTHANUM ALUMINATE

TYPICAL PROPERTIES:

Chemical Formula: LaAlO₃

Density: 6.57

Molecular Weight: 213.89

Color: Colorless to light brown

Crystal Structure: Distorted Perovskite

              Crystal System (RT):                       R3m a = 5.377 A

              Rhombohedral:                                a = 60.13

              Crystal System (>500 ^oC):Pm3m a = 3.821 A

              Cubic

Phase Transition: -500 ^oC 2^nd Order

Twin Structure: Twin boundaries parallel to 100 planes in pseudo-cubic cell.

Lattice Constant: A = 5.357

Melting Temperature: 2110 ^oC

Mohs Hardness: 5-5.6

Dielectric Constant: 20-25

Thermal Conductivity: 10 Watts per Degree per Meter

Thermal Expansion: -10 X 10⁶/ ^oC