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首页> 外文期刊>Contributions to Mineralogy and Petrology >Compositional dependence of elastic properties and density of glasses in the system anorthite-diopside-forsterite
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Compositional dependence of elastic properties and density of glasses in the system anorthite-diopside-forsterite

机译：钙长石-透辉石-镁橄榄石体系的弹性和玻璃密度的成分依赖性

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摘要

The compressional (v_p) and shear (v_s) wave velocities of 20 glasses in the pseudoternary system anorthite (An)-diopside (Di)-forsterite (Fo) were measured by Brillouin spectroscopy as a means of constraining the effect of composition on the elasticity of glasses. The velocity data together with measured densities were used to calculate the elastic properties: Young's modulus (E), adiabatic bulk modulus (K_s), shear modulus (G), and Poisson's ratio (#sigma#). The data show that different chemical constituents affect the density, velocities and elastic properties in a highly systematic way. All of the properties we examined are well described by ideal mixing of molar properties. The addition of MgO strongly increases the bulk, Young's and shear moduli. The results are compared to different models describing the elastic properties of glasses as a function of chemical composition. We show that the influence of magnesia is underestimated in previous models, in some cases due to a lack of appropriate experimental data. The relatively large values of elastic moduli for magnesia-rich glasses can be explained by the high bonding strength between magnesium and SiO_4 and AlO_4 tetrahedra. The strongest effect of magnesium is on the bulk modulus; the shear modulus is less affected. Therefore, Poisson's ratio shows a modest increase with increasing MgO content. The observed increase of Poisson's ratio with increasing MgO content may be explained by a reduced bond strength between tetrahedral due to the addition of MgO.
机译：通过布里渊光谱法测量了假三元系钙长石（An）-透辉石（Di）-镁橄榄石（Fo）中20块玻璃的压缩（v_p）和剪切（v_s）波速，以此作为限制成分对弹性的影响的手段眼镜。速度数据与测得的密度一起用于计算弹性性能：杨氏模量（E），绝热体积模量（K_s），剪切模量（G）和泊松比（＃sigma＃）。数据表明，不同的化学成分以高度系统的方式影响密度，速度和弹性。理想的摩尔特性混合很好地描述了我们检查的所有特性。 MgO的添加极大地增加了体积，杨氏模量和剪切模量。将结果与描述玻璃的弹性特性（作为化学成分的函数）的不同模型进行比较。我们表明，在某些情况下，由于缺乏合适的实验数据，氧化镁的影响被低估了。镁含量高的玻璃的弹性模量值较大，可以通过镁与SiO_4和AlO_4四面体之间的高结合强度来解释。镁最强的作用是对体积模量的影响。剪切模量的影响较小。因此，泊松比显示出随着MgO含量的增加适度增加。观察到的泊松比随MgO含量的增加而增加，可以解释为由于加入MgO而使四面体之间的结合强度降低。

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