Lanthanum Aluminate single crystal has a lattice constant (a=3.790 Å) which fits high Tc superconductive material (such as YBCO: 3.86 Å) very well, proper dielectric constant and low dielectric loss in microwave band, so it is suitable for high Tc microwave electronic devices (for example high Tc superconductive filter in mobile communication). It is grown by Czechrolsky method, possible to get large size (2”and 3” in diameter) and high quality crystal and substrate. It is an important substrate that has been applied in communication industry.

Crystal structure

triclinic，3m，

~Peroviskite

Cell parameter

a=3.790Å, α=90˚5’

for pseudocubic

（°K）

Melting point

2373

（g/cm³）

Density

6.52

（J/g·k）

Specific Heat

0.427（298°K）

（W/m·k）

Thermal conductivity

11.6(300°K)

（x10^-6k^-1）

Thermal expansion

11.6(940°K)

（εr）

Dielectric constant

24(295°K)

23.7(80°K)

(18-35GHz)

（tgδ）

Dielectric loss

6x10^-6(80°K)

microwave

（Mohs）

Hardness

6.5

Growth Method

Czokralski

Specifications

Standard Size:

Ф3″,Ф2″,Ф1″, 20x20，10x10，10x5，10x3mm or customer design.

Thickness: 0.5mm，1.0mm.

Thickness tolerance:±0.02mm

or 0.005mm for special order;

Polish: one or two sides

Orientation：＜100＞＜110＞＜111＞

Orientation accuracy: ±0.5°

Edge Orientation accuracy: 2°

（or 1°for special order）

Cut with special tilt angle ：

available(tilt angle:1°－45°)

Micro roughness Ra：

≤5Å（5μm×5μm）