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Rare earth doping effect on the elastic moduli. of low silica calcium aluminosilicate glasses

机译:稀土掺杂对弹性模量的影响。低硅钙铝硅酸盐玻璃

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摘要

Elastic moduli (E, G, K, v) 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 MPa m(1/2) and the thermal shock resistance is 339 +/- 102 W/m. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 34]
机译:使用脉冲回波超声技术测量了在空气中和真空条件下熔化的,掺有Er2O3和Yb2O3的SiO2 <10 mol%的硅铝酸钙玻璃的弹性模量(E,G,K,v)。当稀土氧化物代替Al2O3时,其弹性性能降低了<5%,从0.2到1.5 mol%(约8 wt%)。杨氏模量在测量误差内没有变化。德拜温度在369 +/- 9和352 +/- 9 K之间变化,这是在假设稀土离子充当破坏玻璃结构的网络改性剂的情况下进行解释的。未掺杂的铝酸钙玻璃的断裂韧性为1.4 +/- 0.3 MPa m(1/2),抗热震性为339 +/- 102 W / m。 (C)2002 Elsevier Science B.V.保留所有权利。 [参考:34]

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