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首页> 外文期刊>The American mineralogist >The elastic properties of diopside, CaMgSi_2O_6
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The elastic properties of diopside, CaMgSi_2O_6

机译:透辉石CaMgSi_2O_6的弹性

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The 13 single-crystal elastic moduli of two samples of diopsidic pyroxenes close to the ideal composition (CaMgSi2O6) from different locations have been measured at ambient pressure and room temperature by Brillouin spectroscopy. We obtain (in GPa, ±1σ uncertainty): C_(11) = 229.0(4), C _(22) = 179.0(4), C_(33) = 242.5(4), C_(44) = 78.9(3), C_(55) = 68.1(2), C_(66) = 78.2(3), C_(12) = 78.0(7), C_(13) = 69.8(6), C_(23) = 58.0(7), C_(15) = 9.9(3), C_(25) = 6.1(5), C_(35) = 40.9(3), C_(46) = 6.6(2), and C_(11) = 226.1(9), C_(22) = 179.5(8), C_(33) = 239.2(9), C_(44) = 78.1(6), C_(55) = 69.2(4), C_(66) = 76.4(8), C_(12) = 77.4(10), C_(13) = 70.2(13), C_(23) = 56.7(16), C_(15) = 9.9(7), C_(25) = 5.9(12), C_(35) = 41.0(7), C_(46) = 6.8(4) for the two diopside samples. There are no major differences in the elastic tensor of the nearly pure diopside composition compared with the second sample containing slightly higher Al and Fe contents. Polycrystalline averaging of the Cij for the aggregate bulk and shear moduli yield Ks = 114.6(7) GPa, G = 72.7(4) GPa and Ks = 113.7(8) GPa, G = 72.2(5) GPa for the two diopside samples. The shear moduli reported here are 8% larger than those determined from previous measurements on a similar natural sample. We confirm the existence of systematic correlations between the composition of the M2 site and most of the Cij values. No unusual compositional dependence of Cij values or the shear modulus near end-member diopside composition is observed.
机译:通过布里渊光谱法在环境压力和室温下测量了两个来自理想位置的接近理想成分(CaMgSi2O6)的二元辉石样品的13个单晶弹性模量。我们获得(在GPa中,±1σ不确定度):C_(11)= 229.0(4),C _(22)= 179.0(4),C_(33)= 242.5(4),C_(44)= 78.9(3 ),C_(55)= 68.1(2),C_(66)= 78.2(3),C_(12)= 78.0(7),C_(13)= 69.8(6),C_(23)= 58.0(7) ),C_(15)= 9.9(3),C_(25)= 6.1(5),C_(35)= 40.9(3),C_(46)= 6.6(2)和C_(11)= 226.1( 9),C_(22)= 179.5(8),C_(33)= 239.2(9),C_(44)= 78.1(6),C_(55)= 69.2(4),C_(66)= 76.4( 8),C_(12)= 77.4(10),C_(13)= 70.2(13),C_(23)= 56.7(16),C_(15)= 9.9(7),C_(25)= 5.9( 12),两个透辉石样品的C_(35)= 41.0(7),C_(46)= 6.8(4)。与含Al和Fe含量稍高的第二个样品相比,几乎纯的透辉石组合物的弹性张量没有重大差异。对于两个透辉石样品,总体积和剪切模量的Cij的多晶平均产率Ks = 114.6(7)GPa,G = 72.7(4)GPa,Ks = 113.7(8)GPa,G = 72.2(5)GPa。在此报告的剪切模量比以前在类似的天然样品上测得的剪切模量大8%。我们确认M2站点的组成与大多数Cij值之间存在系统相关。没有观察到Cij值或端部透辉石成分附近的剪切模量的异常成分依赖性。

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