To investigate the feasibility of blue cubic zirconia as high-energy ray dosimeter materials, the X-ray/electron beam (EB) radiation and the subsequent ultraviolet–visible (UV) lighting/heat treatment were conducted on blue cubic zirconia. Furthermore, the optical absorption, elemental content, the valence states of Co and Zr, and the type of O elements of ZrO2 was analyzed by ultraviolet–visible absorption spectroscopy, X-ray diffractometry, X-ray photoelectron spectroscopy, electron paramagnetic resonance spectroscopy and thermoluminescence spectroscopy to demonstrate the influence of internal defects formed by the above treatment methods on the color reversed of cubic zirconia. The experimental results showed that the color of ZrO2 changed from blue to brownish yellow after irradiation and reverted to original color after heat treatment or UV lighting. Oxygen vacancies generated by Zr3+ ions occupying the Zr4+ ions site in ZrO2 were increased after irradiation and were decreased after heating or lighting during the color reversible of the blue ZrO2, which is related to the electron transition between Co-3d orbit and O-2p orbit. 

Reversible discoloration mechanism of irradiated blue cubic zirconia single crystals

Oxygen vacancy is an inherent defect of aquamarine crystals. The concentration and properties of this defect have an essential influence on aquamarine crystals and optical properties. This paper reports that blue in aquamarine crystals is due to the interaction between Fe2+ and oxygen vacancy. Infrared and Raman spectra showed that more Fe2+ replaced Al3+ in dark sample A than in light sample B. Oxygen vacancies were found in all samples. Dark sample A strongly absorbed the 830 nm band associated with Fe2+ in the UV–Vis–NIR absorption spectrum. The band gap of dark sample A was smaller than that of light sample B, and the difference in band gap was related to the concentration of oxygen vacancies. X-ray Photoelectron Spectroscopy showed that the oxygen vacancy concentration in sample A was higher than that in sample B, which showed that the oxygen vacancy concentration affected the color depth of aquamarines. 

The effect of oxygen vacancies on the color formation of aquamarine

The visable light absorption and color reversible mechanism of Co doping cubic zirconia single crystals after X-ray irradiation

Substantiation of the Effect of Fine-Grained Microstructure of Silicon Nitride Based Ceramics on the Protective Properties of Metal-Ceramic Macrocomposite Plates

The Effect of Hydrogen Concentration on the High-Temperature (600 °C) Reduction Performance and Strength of YSZ–NiO(Ni) Anode Material for Solid Oxide Fuel Cells

The high temperature stability of zirconia crystals is improved by regulating the content of the stabilizer Y2O3. Cubic zirconia crystals with thermal stability are one of the most active academic...

Local Structure Regulation and Spectroscopy Study of Blue Cubic Zirconia

Different jadeites have different characteristics. In this paper, the La-ICP-MS test is used to compare and analyze the elemental characteristics of jadeite in Guatemala and the Qing dynasty. The test results show that the highest value of Guatemalan jadeite Ca can reach 2.5 apfu, while the highest value of Qing dynasty jadeite is 0.73 apfu. The highest value of Na is the same for both. The concentration distribution range and highest value of Guatemalan jadeite and Qing dynasty jadeite Mg/(Mg + Fe) are the same. Guatemalan jadeite and Qing dynasty jadeite have a very wide content of trace elements. Qing dynasty Ca/(Mg + Fe) distribution is wider. Concentrations of Guatemalan and Qing dynasty jadeite Sr/Ba, which is a marine sediment, are greater than 1. The Ba in the Qing dynasty jadeite sediments contains a large amount of clay, resulting in higher levels than the average amount in Guatemalan jadeite Ba. The standard distribution map is similar, showing a “horn” shape. The Sr distribution is uneven. Guatemalan jadeite is heavily enriched in rare earths. Eu shows positive and negative abnormalities. The total rare earth value is 8.15 ppm. Qing Dynasty jadeite shows light rare earth enrichment, and Eu is a positive anomaly. The total rare earth value is 7.07 ppm. The characteristics of the two elements are somewhat similar, but different, which does not rule out the possibility that Qing dynasty jadeite came from Guatemala.

https://www.mdpi.com/1420-3049/28/7/3119/pdf?version=1680267603

Comparative Analysis of Guatemalan and Qing Dynasty Jadeite Elemental Signs

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Local Structure Regulation and Spectroscopy Study of Blue Cubic Zirconia

Comparative Analysis of Guatemalan and Qing Dynasty Jadeite Elemental Signs