Influence of high pressure on the refractive index and density of tholeiite basalt glass

Effect of high pressure on the refractive index and density of natural aluminosilicate glasses of alkali basalt composition in the SiO2-Al2O3-TiO2-Fe2O3-P2O5-FeO-MnO-CaO-MgO-Na2O-K2O system

“…This accidental error involves the error in the determination of the refractive index of the methanol-ethanol (4 : 1) alcohol mixture. The change in the sample thickness can be disregarded, because our estimates demonstrated [3,4] that the systematic error due to a decrease in the thickness for silicate glasses leads to an increase in the refractive index, on the average, by 0.1% at pressures of 0-5.0 GPa. The pressure dependence of the refractive index for the alkali basalt glass is plotted in Fig.…”

“…Among the glasses studied in our previous works, the natural glass of composition (SiO 2 ) 0.534 · (TiO 2 ) 0.013 · (Al 2 O 3 ) 0.093 · (FeO) 0.090 · (MnO) 0.002 · (CaO) 0.123 · (MgO) 0.113 · (Na 2 O) 0.030 · (K 2 O) 0.001 · (P 2 O 5 ) 0.001 (referred to as the tholeiite basalt glass) contains a sufficiently large number of aluminum-oxygen tetrahedra (~15 wt % Al 2 O 3 ) whose charge is predominantly compensated for by alkaline-earth cations [4]. In nature, there are glasses with similar compositions.…”

“…In particular, in our earlier works [1,2], we developed the interference method for measuring the refractive index of isotropic and anisotropic materials under pressure by using an apparatus with diamond anvils. With the use of this method, we measured the refractive indices of glasses containing from 100 to 50 mol % SiO 2 at pressures up to 5.0 GPa [3][4][5][6]. The densities and compressibilities of the studied glasses were calculated from the measured refractive indices within the theory of photoelasticity [7].…”

High-pressure radiative conductivity of dense silicate glasses with potential implications for dark magmas

“…Initial refractive indices of 1.55 and 1.57 were adopted for E-glass and M-glass, respectively 39,40 , and a slight pressure dependence of the refractive indices of both silicate glasses was assumed based on compilations from previous literature 41 . Although thermal conditions at the bottom of the mantle are poorly constrained, temperatures are expected to be 43,000 K. We have therefore calculated the radiative contribution to thermal conductivity of the silicate melts up to 7,000 K (Fig.…”

Friction and wear properties of basalt fiber reinforced/solid lubricants filled polyimide composites under different sliding conditions

“…in comparison with glass and asbestos fibers. 21 The investigations of basalt fibers (BFs)-reinforced polymer composites have been actively pursued. Currently, most studies focused on the processes and mechanical and physical properties of basalt fibers.…”