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ZERODUR

ZERODUR® is a glass ceramic characterized by a phase of evenly distributed nano-crystals within a residual glass phase. It contains around 75 weight percent crystalline phase with a high quartz structure. The crystal structure has a negative linear thermal expansion, while the other glass phase has a positive linear thermal expansion. The material is adjusted in a way that the positive thermal expansion of the glass phase and the negative thermal expansion of crystal structure effectively neutralize each other. The crystals are typically only 50 nm in diameter, and ZERODUR appears reasonably transparent because the refractive indices of the two phases are almost identical. The most important properties of zerodur are:

  • Nearly zero thermal expansion
  • Excellent homogeneity
  • High internal quality
  • Outstanding chemical stability
  • Polishable to a high accuracy
  • Good processing behavior
  • Low helium permeability

Figure 1&2 and table 1 give an overview of ZERODUR’s properties.

 

Figure 1: External transmittance curve of ZERODUR at sample thickness of 5 mm and 25 mm.

 

Figure 2: Thermal expansion coefficient curve of ZERODUR as a function of temperature.

  Optical Properties
 
  Wavelength
(um)
656.27
643.85
587.56
546.07
486.13
479.99 435.83  
  Designated
Letter
C C' d e F F' g  
  Refractive
Index
1.5394 1.5399 1.5424 1.5447 1.5491
1.5497 1.5544  
  Abbe
Number
    56.1 55.9
     
  Mechanical Properties and Chemical Properties
 
  Density
(g/cm3)
Poisson's
Ratio
Knoop
Hardness
Young's
Moduluds (GPa)
Acid
Resistance Class
Alkali
Resistance Class
Climatic
Resistance Class
Stain
Resistance Class
 
  2.53
0.24 620 90.3 1 1
1 0  
  Table 1:ZERODUR Properties
 

Low Expansion Materials :  

ZERODUR® is a registered trademark of Schott Glass Technologies.

Copyright © 2016 Precision Micro-Optics Inc. All Rights Reserved.