A study by density measurements and indentation tests of a calcium silicophosphate bioactive glass with different MgO or SrO contents

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• 作者：Porto Ló ; pez ; J.M. ; Galliano ; P.G. ; Cavalieri ; A.L. ; Ló ; pez ; J.M.P.
• 刊名：Journal of Non-Crystalline Solids
• 出版年：1995
• 期刊代码：50_00223093
• 类别：ms
• 出版时间：December, 1995
• 卷：191
• 期：3
• 页码：311-320
• 文件大小：595 K

摘要

Vickers and Knoop indentation techniques and density measurements have been employed to study the structure of two series of glasses in the system CaO-RO-SiO₂-P₂O₅-CaF₂ (R = Sr, Ca, Mg) with: (a) constant alkaline earth oxide content, but using different cations (Ca, Ca+Sr, Ca+Mg), and (b) increasing alkaline earth concentration (Mg and/or Ca). Samples have been prepared by melting the raw materials at 1400°C, and pouring the liquid on a steel plate. From the experimental data, microhardness, H_V fracture toughness, K_IC and values for mean atomic volume, V_A, and ionic volume fraction, V_F, were obtained. The last parameter is proposed as a suitable one for the analysis of variations in cationic coordination numbers, n. The results show that Mg, Ca and Sr have similar values of n. The value of n is proposed to be six.