Hydrothermal treatments of soda-lime silicate glass allow for a substantial toughening of the material. Molecular water diffuses within the glass structure and leads to substantial densification of the network detected by antimatter probe. The water diffusion on the tin side of the float glass is slower leading to a reduced resistance to the crack formation. Abstract Hydrothermal treatments of soda–lime silicate glass cause a remarkable improvement in the resistance to flaw formation with an increase of the critical load to ≈1 kgf. This remarkable effect is achieved even if the reaction ..read more

Abstract A vacuum environment is usually preferred for reducing the dwell time and sintering temperature for doped zirconia ceramics. However, for the present work with 10 mol.% CaO-doped ZrO2 (10CaSZ) ceramics, both hot-pressing and vacuum sintering techniques yielded ceramics with open pores (ρ ∼ 93%) and significant amounts of the deleterious monoclinic phase (>$ > $50%). This is in stark contrast with the conventionally sintered highly dense (>99%) 10CaSZ ceramics, where only tetragonal and cubic phases were noted. Probing via electron paramagnetic resonance (EPR) de ..read more

Abstract Oxygen transport membranes (OTMs) can be operated as efficient oxygen separators and oxygen distributors, but their diffusion is hampered by the lack of appropriate materials with sufficient chemical stability in operating conditions. Mixed ionic-electronic conducting SrTiO3-based perovskite are a promising option due to their remarkable resistance in reducing environments, but they are prone to degradation in CO2-containing atmospheres owing to carbonate formation. In this study, we propose new Ca1- xSr xTi0.8Fe0.2O3- δ perovskites where the Sr2+ cation is partially substituted by Ca ..read more

Abstract Oxygen produced through in-situ resource utilization (ISRU) is critical to maintaining a permanent human presence on the lunar surface. Molten regolith electrolysis and carbothermal reduction are two promising ISRU techniques for generating oxygen directly from lunar regolith, which is primarily a mixture of oxide minerals; however, both processes require operating temperatures of 1600°C to melt lunar regolith and dissociate the molten oxides. These conditions limit the use of many oxide refractory materials, such as Al2O3 and MgO, due to rapid degradation resulting from reactions bet ..read more

Abstract In this paper, Ni was introduced into the matrix of carbon fiber reinforced SiOC (C/SiOC) composites by the precursor infiltration and pyrolysis method to catalyze the generation of in situ formed nanostructures including carbon nanotubes (CNTs), turbostratic carbon, and SiC. The effect of in situ formed nanostructures catalyzed by Ni on the properties of the C/SiOC composites was investigated. The results demonstrated that the presence of in situ formed nanostructures in the matrix improved the densification and mechanical properties of C/SiOC composites. In addition, the incorporati ..read more

A multi-scale optimization strategy combining local phase control and microstructure regulation can be used to simultaneously enhance the W rec and η. Excellent W rec of 5.61 J/cm3 and high η of 85.1% are obtained at a largely improved E b of 710 kV/cm. Decreased grain size, increased bandgap, and the coexistence of the antiferroelectric phase and paraelectric phase contribute to superior energy-storage performance. Abstract Dielectric ceramics have attracted significant attention in power electronic systems, owing to their exceptional charging and discharging speeds, as well as their h ..read more

Abstract NaNbO3-based (NN) energy storage ceramics are known for exhibiting high maximum polarization (P max) and large recoverable energy density (W rec). However, the huge energy loss density (W loss) has been a limiting factor in improving energy storage performance. Therefore, a ternary system was designed to achieve both huge W rec and efficiency (η). The combination of 0.35Bi(Zn0.5Ti0.5)O3–0.65BaTiO3 (BZTBT) was chosen to reduce grain size and disrupt the long-range ordered domains, thereby inducing the polar-nano-regions to mitigate W loss. The optimal performance was achieved with the ..read more

Abstract Polymer-derived ceramics (PDCs) are a class of advanced materials obtained by pyrolysis in a controlled atmosphere of an organosilicon polymer. Their functional as well as mechanical properties originate from the peculiar nanostructures developed during the pyrolysis. Herein, we investigate the formation of transient microporosity in a model PDC (methyl-silsesquioxane) obtained in Ar, Ar–5%H2, CO2, and air. It is shown that a common evolution can be detected up to 700°C. At this temperature, the structure of the material in terms of chemical bonds is marginally changed (only redistrib ..read more

Abstract The novel orange-red light-emitting garnet-type phosphors Li3Bi3Te2O12:xSm3+ (0.005 ≤ x ≤ 0.25) were first synthesized using the high-temperature solid-state reaction method. The phase structure was recorded with XRD. Raman spectroscopic analysis was conducted for the first time to extract detailed structural insights of the tellurate garnet Li3Bi3Te2O12:Sm3+. The characteristics of the obtained compounds were investigated, including particle morphology, elemental mapping, diffuse reflection spectra, excitation and emission spectra, thermal stability, chromaticity coordinates accordin ..read more

Abstract While the MgCl2 mixing alite paste causes degradation of the modulus and hardness of C–S–H formed, the underlying degradation mechanism needs to be better understood. This study comprehensively analyzed the mechanical properties of alite pastes mixed with MgCl2 solutions, examining the effects at both mesoscale and nanoscale. The in situ X-ray diffraction analysis revealed that the formation of brucite occurred at a very early age together with the formation of portlandite, which may induce a loosened packing density of C−S−H and served as the primary cause of modulus and hardness deg ..read more