Y₃NbO₇ transparent ceramic series for high refractive index optical lenses

Abstract

A 2 B 2 O 7 and A 3 BO 7 transparent ceramic families are potential materials for optical lenses because of their high refractive index. Although nonstoichiometry is widely present in these material families, its effect on refractive index and optical propertieshas not yet been fully studied. In this study, optical properties are reported for the Y 3 NbO 7 transparent ceramic series, Y 1−x Nb x O 1.5+x (x = 0.20, 0.22, 0.24, 0.25, 0.26), which were fabricated by a pressureless pre-sintering and a hot isostatic pressing postsintering treatment. The refractive index increases from 2.04 to 2.10 (at 587.6 nm) as the Nb content x increases, which is mainly attributed to the variation in the oxygen ion/vacancy ratio. The Abbe number is larger than 40, showing a decreasing trend as the Nb content x increases. The specimen with x = 0.24 has the highest inline transmittance, which were 62% and 76% at 587.6 and 2000 nm, respectively, for a 1-mm-thick specimen. Through the approach of nonstoichiometry, Y 1−x Nb x O 1.5+x series exhibit balanced properties of refractive index, Abbe number, and transmittance, which can be considered as a promising candidate for high refractive index optical lenses. K E Y W O R D Sdefect fluorite, optical materials/properties, refractive index, transparent ceramics SUPPORTING INFORMATIONAdditional supporting information may be found online in the Supporting Information section.

Ho3+-doped Y3NbO7 transparent ceramic elaborated by air pre-sintering and post-HIP treatment as potential LASER gain material at 2 μm

“…The refractive index, n(), was determined using experimental ellipsometry measurements (described in supplementary information Figure SI2). A value of 1.99  0.01 at around 2 µm was obtained, in good agreement with the values reported by Huang et al [21]. The Ho 3+ -doped compound presents a large optical window between 310 nm and 8 m.…”

Progress in ceramic materials and structure design toward advanced thermal barrier coatings

“…In addition to zirconate-based ceramics, there is still a high demand for the exploration of new ceramic materials for TBCs. In this case, rare-earth niobates that are widely used as dielectric materials, magnetic materials, protonic ceramic fuel cells (PCFC), and luminescent materials have been considered as new ceramic TBC materials [65][66][67][68][69][70]. As shown in Fig.…”

A Promising Radiation Thermal Protection Coating Based on Lamellar Porous Ca‐Cr co‐Doped Y3NbO7 Ceramic

“…However, Chunlei Wan et al, found that the changing of Re/Nb cation ratio and oxygen ion/vacancy ratio can hardly change the infrared transparency, and consequently, the low emissivity nature of niobates. [7] To improve the emissivity of these thermal barrier ceramics, one would introduce gap-states and lattice distortions into the structures, for example, by incorporating additional rare earth and/or transition metal cations, such as Ce 4+ , Mn 4+ , Ca 2+ , and Cr 3+ . into the host lattice.…”

“…However, Chunlei Wan et al., found that the changing of Re/Nb cation ratio and oxygen ion/vacancy ratio can hardly change the infrared transparency, and consequently, the low emissivity nature of niobates. [ 7 ]…”