GeO2 Base Glasses: G87a

About Property Data Summaries.

Reference: NBS Technical Note 1212

Other materials: Germanate Glasses

Material Summary:

Molar composition: 87.5% GeO2 + 12.5% K2O

Property Summary:

Property                           Value  Environment  Notes
---------------------------------  -----  -----------  --------------------------------------
Crack Growth Exponent []   .......: 
Elastic Modulus [GPa]   ..........: 61.3   N2 gas      
Fracture Energy [J/m2]  ..........:  3.9   N2 gas     Notched beam,precracked
samples,
                                                       crosshead speed 3.4 µm/s,dew point 50 °C
Fracture Toughness [MPa m1/2].....:  0.72  N2 gas     Notched beam,precracked samples,
                                                       crosshead speed 3.4 µm/s,dew point 50 °C


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Date created: 08 February 2001
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