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|Type:||Artigo de evento|
|Title:||Rare Earth Doping Effect On The Elastic Moduli Of Low Silica Calcium Aluminosilicate Glasses|
|Abstract:||Elastic moduli (E, G, K, ν) of calcium aluminosilicate glasses with < 10 mol% of SiO2 doped with Er2O3 and Yb2O3, melted in air and under vacuum conditions, have been measured using the pulse echo ultrasonic technique. There was a decrease of the elastic properties, < 5%, as rare earth oxide replaces Al2O3 from 0.2 to 1.5 mol% (about 8 wt%). The Young's modulus did not vary within errors of measurements. The Debye temperature varied between 369 ± 9 and 352 ± 9 K, which is explained assuming that the rare earth ions acts as network modifiers disrupting the glass structure. The undoped calcium aluminate glasses fracture toughness is 1.4 ± 0.3 MPam1/2 and the thermal shock resistance is 339 ± 102 W/m. © 2002 Elsevier Science B.V. All rights reserved.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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