Structural investigation of gallate glass using L3-edge extended X-ray absorption spectroscopy and computer simulation

Abstract

General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. ) prepared by aerodynamic levitation and laser heating. The short range ordering around the rare-earth has been obtained by combined technique including molecular dynamics simulation (MD). The results give an average Pr-O coordination number of 6.68(2) and a mean Ga-O coordination number of 4.29(2).A good agreement between the experimental data and the simple molecular dynamics simulations give rising a glass network of a Pr-O polyhedral structure and a predominant GaO 4 tetrahedral network in this glass.

Principal Vibration Modes of the La2O3–Ga2O3 Binary Glass Originated from Diverse Coordination Environments of Oxygen Atoms

“…For Ga−Ga, Ga−La, and La−La interactions, both A ij and C ij were set to 0, i.e., only Coulomb interactions were considered. 15 The above results are qualitatively consistent with the MAS NMR spectra in Figure 1. Figure 4b shows that the coordination number of the La−O pair is mainly 6−9.…”

“…Recently, binary glass systems containing only rare-earth oxides and gallium oxide were synthesized by the levitation technique. 15,16 Particularly, La 2 O 3 −Ga 2 O 3 glass exhibited excellent optical properties, such as high refractive index, low dispersion, wideband transmittance, and efficient fluorescent emission by rare-earth activation. 16−19 These properties can be attributed to the high oxygen polarizability, low vibrational frequency, and large rare-earth solubility of the La 2 O 3 −Ga 2 O 3 glass.…”

“…However, NWF-free materials generally have low glass-forming abilities, making it difficult to obtain glass in a bulk form. A levitation technique is suitable for obtaining bulk glass with unconventional compositions without NWFs − since it efficiently suppresses the heterogeneous nucleation and promotes deep undercooling of the melt. Recently, binary glass systems containing only rare-earth oxides and gallium oxide were synthesized by the levitation technique. , Particularly, La 2 O 3 –Ga 2 O 3 glass exhibited excellent optical properties, such as high refractive index, low dispersion, wideband transmittance, and efficient fluorescent emission by rare-earth activation. − These properties can be attributed to the high oxygen polarizability, low vibrational frequency, and large rare-earth solubility of the La 2 O 3 –Ga 2 O 3 glass.…”

Low phonon energies and wideband optical windows of La2O3-Ga2O3 glasses prepared using an aerodynamic levitation technique

“…Very recently, Kidkhunthod et al . reported the glass formation of Pr 3 Ga 5 O 12 glass by a levitation technique and investigated local structure around Pr and Ga atoms10.…”

Aerodynamic levitation, supercooled liquids and glass formation

“…Containerless methods have been shown to extend glass formation by enabling deep supercooling into regions where fragile liquids start to become viscous [5,[73][74][75][76][77][78][79]. Cooling rates of the order of ~30-1000 K/s are typically obtained from quenching bulk glasses in the aerodynamic levitator.…”