Adiabatic Elastic Moduli of Vitreous Calcium Alurninates to 3.5 Kilobars
Adiabatic Elastic Moduli of Vitreous Calcium Alurninates to 3.5 Kilobars
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玻璃体铝酸钙的绝热弹性模量为 3.5 公斤
DOI：
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发表时间：
1969
期刊：
影响因子：
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通讯作者：
M. Manghnani
中科院分区：
文献类型：
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作者：
T. Sokolowski;M. Manghnani
用“脉冲叠加”超声干涉法测量了4个玻璃铝酸钙样品在25℃、3.5kbar压力下的弹性波速和有关的弹性参数，得到的体积(K2)、剪切(μ)模数和泊松比(σ)远高于报道的硅酸盐玻璃。然而，铝酸钙的体积弹性系数与Soga和Anderson提出的29种玻璃的体积弹性系数与每离子对的比体积之间的关系很好地吻合。掺SiO_2真空熔融铝酸钙的DVp/DP值最高(8.9x10−3 Km/(s.kbar))，掺BaO的气熔样品最低(6.8x10−3 Km/(s.kbar))。BaO掺杂引起了剪切波速-压力关系的反常行为，掺杂BaO的空气熔融样品的dv3/dp为−4.1×10−3 km/(s.kbar)。1bar的可压缩性和可压缩性随压力的变化率的差异似乎与组成和熔体条件有关。Dk3/dp为4.0~4.7，dσ/dp为6.8~7.5×10−4/kbar。
“Pulse superposition” ultrasonic interferometry was used to measure elastic wave velocities and related elastic parameters of four vitreous calcium aluminate specimens at pressures up to 3.5 kbars at 25°C. The values obtained for the bulk (K2) and shear (μ) moduli and for Poisson's ratio (σ) were much higher than those reported for silicate glasses. The bulk moduli for the calcium aluminates, however, fit quite well with the relation between bulk modulus and specific volume per ion pair suggested by Soga and Anderson for 29 glasses. The (dvp/dP) value was highest (8.9×10−3 km/(s.kbars)) for the SiO2-doped vacuum-melted calcium aluminate and lowest (6.8×10−3 km/(s.kbars)) for the BaO-doped air-melted specimen. The BaO doping seemed to cause anomalous behavior in the shear wave velocity vs pressure relation; the (dv3/dP) value for the BaO-doped air-melted specimen was −4.1 ×10−3 km/(s.kbars). The differences in the compressibility at 1 bar and the rate of change of compressibility with pressure appear to be related to composition and melt conditions. The (dK3/dP) values ranged from 4.0 to 4.7 and the (dσ/dP) values from 6.8 to 7.5 ×10−4/kbars.