Sapphire single crystals

Ruby single crystals

Large single crystals of Ruby (and other crystals such as Sapphire, Garnets, etc...) grown by the Horizontal Directed Crystallization Method (dimensions 250 x 150 x 20-30 mm).

Features:

high melting point, extremely hard and resistant to abrasion, low dielectric constant - excellent electroinsulating properties, low friction coefficient, shock resistant, high refractive index, broad optical transparency (from UV to IR), chemically inert and stable

Applications:

laser, jewelery, optics, optoelectronics, microelectronics, semiconductors, chemical industry, substrates, rods, ribbons, components of machinery and equipment, such as water and electrical meters, relays and watches and other applications

Ruby single crystal

Basic properties:

Physical properties:
Chemical formula Al2O3 : Cr3+
Symmetry ¯3m, R3c
a = 4.748 Å
c = 12.957 Å
Specific mass 3 984 kg.m-3 - 4 010 kg.m-3
 
Thermal properties:
Melting point 2 323° K
Thermal expansion 5.0 x 10-6 K-1
Maximum temperature of application 2 125 - 2 225 K
 
Mechanical properties:
Mohs hardness 9 - 9.4
Tensile strength 415 MPa
Compression strength 2 000 MPa
Bending strength 700 MPa
 
Optical properties:
Refractive index 1.765 at 0.65 µm
Transmission 0.17 - 6.5 µm
 
Chemical properties:
Solubility insoluble in common bases and acids under 1000° C
(is attacked only by HF and H3P04 at above 300° C)
Chemical stability stable in contact with W, Mo, SiC
(in O2 absence) up to melting point

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