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• W4308153370 abstract "• New TiO 2 -LaO 3/2 -HfO 2 glass has been prepared by aerodynamic levitation method to research the effect of HfO 2 on optical, thermal and mechanical properties. • Hafnium oxide can increase the refractive index n d up to 2.324. • Hafnium oxide has a higher melting point than lanthanum oxide, but its incorporation reduces glass transition temperature T g and onset crystallization temperature T x . • TiO 2 -LaO 3/2 -HfO 2 glass performs strong mechanical properties with hardness of 9.058 Gpa. 70.21TiO 2 -(29.79-x)LaO 3/2 -xHfO 2 (x=0, 1.5, 3, 4.5, 6) glasses were fabricated by aerodynamic levitation technique. XRD shows the amorphous state of these synthesized glasses. DSC indicates that the glass transition temperature (T g ) and onset crystallization temperature (T x ) decreases while ΔT (=T x - T g ) decreases and then increases with the increase of HfO 2 . Density increases from 4.931 to 5.147 gcm −3 with the addition of HfO 2 , while hardness increases from 8.587 to 9.058 GPa. Raman spectra indicate that the maximum phonon energy is 720 cm −1 . The transmittance region of glasses is wide from 386nm to 6.5 μm, and the largest transmittance can reach 72%. Furthermore, Abbe number decreases from 17.797 to 16.969 with the addition of HfO 2 , which is attributed to the increase in the inherent absorption wavelength (λ 0 ). Finally, the refractive index increases from 2.293 to 2.324 with the addition of HfO 2 , which is attributed to the increase in oxygen packing density (OPD), decrease in molar volume (V m ). The reason for the relatively small increase in the refractive index is that the oxygen polarizability has a certain decrease, which offsets a part of the effects of V m and OPD. These results are useful for designing new optical glass with excellent properties." @default.
• W4308153370 created "2022-11-08" @default.
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• W4308153370 date "2023-02-01" @default.
• W4308153370 modified "2023-10-01" @default.
• W4308153370 title "Optical, mechanical and thermal properties in HfO2-doped TiO2-LaO3/2 glasses fabricated by aerodynamic levitation" @default.
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• W4308153370 doi "https://doi.org/10.1016/j.materresbull.2022.112079" @default.
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