The effects of Mn ²⁺ doping on the structural, optical and magnetic properties of the corundum-related oxide Zn₃TeO₆ were investigated. Polycrystalline ceramic samples of the solid solution Zn_3-xMn_xTeO₆ (0<x≤2.0) were prepared by a solid-state reaction route. Phase diagram as a function of Mn concentration indicates monoclinic (C2/c) structure for x<1.0, disproportionated mixing of both monoclinic (C2/c) and rhombohedral (R-3) structure for 1.0≤x≤1.6, and R-3 structure for x≥1.8. Moreover, when x=2.0, ZnMn₂TeO₆ was formed, in which the bond length of Te-O and Mn/Zn-O increased, and the Mn/ZnO₆ octahedra became more distorted. Rietveld refinements of the crystal structures from the powder X-ray diffraction (XRD) data showed that the Zn/MnO₆ octahedra were highly distorted in R-3 phase. With the increase of Mn ²⁺ doping content, the solid solution Zn_3-xMn_xTeO₆ demonstrated not only the structure change from C2/c to R-3, but also the color evolution from light yellow to dark yellow. In optical absorption spectroscopy, with the increase of Mn ²⁺ doping concentration, the absorption at 400-550 nm was enhanced, and the optical band gap of the samples gradually decreased from 3.25 eV (x=0.1) to 2.08 eV (x=2.0). Analysis revealed that the color of samples changed from light yellow to dark yellow is due to the d-d transition of Mn ²⁺ ions in Zn/MnO₆ octahedron. Magnetic measurements indicate that the antiferromagnetic transition temperature of the solid solution gradually increased with the increase of the doping amount of Mn ²⁺, and the doped Mn ²⁺ ions exist in a high spin state.

To reduce the F deficiency defect in MgF₂ thin films deposited with magnetron sputtering, SF₆ was added to the working gas Ar₂ as the reactive gas, and MgF₂ thin films were prepared on quartz glass substrates with radio frequency (RF) magnetron sputtering. The effects of sputtering power on the chemical compositions, microstructure and optical properties of MgF₂ thin film were investigated. The results show that with sputtering power increase from 115 to 220 W, the atomic ratio of F to Mg increased continuously, and reached 2.02 at 185 W, close to ideal stoichiometric ratio of 2: 1. The crystallinity of MgF₂ film improved first, then decreased, and finally changed into amorphous state. Profile of particles composing MgF₂ film became clearer at first, and finally became blurred. Refractive index of MgF₂ film decreased firstly and then increased, and got the lowest value at 185 W, 1.384 at 550 nm wavelength which is very close to that of MgF₂ bulk crystal. The integral transmittance of the coated glass within 300-1100 nm (hereinafter referred to as the transmittance of the thin film) increased first and then decreased, and reached 94.99% at 185 W, higher than that of the bare glass substrate by 1.79%.

Sintering aids are widely used to improve the optical quality of ceramics in the preparation of transparent ceramics. However, sintering aids may deteriorate the luminescent properties of the ceramics. In this work, 0.25at%Pr:LuAG scintillation ceramics were prepared by vacuum pre-sintering combined with hot isostatic pressing. The influences of trace SiO₂ sintering aid on the optical and scintillation properties of the ceramics were studied. The results show that a small amount of SiO₂ below 200 ppm (1 ppm means that addition content is 1×10^-6 g/g) can effectively promote the remove of pore during hot isostatic pressing and improve the optical quality of the Pr:LuAG ceramics. Their in-line transmittance with 150 ppm SiO₂ is about 77% at 400 nm. The effects of pre-sintering temperature and holding time on the optical properties of Pr:LuAG ceramics were also investigated. When completely closed pore structure is formed, further increasing the pre-sintering temperature or prolonging the holding time reduce the densification rate in the hot isostatic pressing process, which is not conducive to the remove of pores and lower the optical quality of the Pr:LuAG ceramics. In addition, trace SiO₂ addition has less effect on scintillation properties of the Pr:LuAG ceramics. Adding trace SiO₂ sintering aid combined with hot isostatic pressing is an effective way to prepare Pr doped garnet scintillation ceramics.