蓝色立方氧化锆的局域结构调控与光谱研究,CrystEngComm

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蓝色立方氧化锆的局域结构调控与光谱研究
CrystEngComm ( IF 2.6 ) Pub Date : 2023-02-03 , DOI: 10.1039/d2ce01674e
Yanlin Wang ₁ , Xinxin Liu ₁ , Shaokui Pan ₁ , Qishen Zhou ₁ , Jun Shu _{1,

2}

Affiliation

_{通过调节稳定剂Y 2} O ₃的含量提高氧化锆晶体的高温稳定性。具有热稳定性的立方氧化锆晶体是氧化锆晶体材料最活跃的学术研究领域之一。尽管如此，蓝色立方氧化锆在高温下变色的原因尚未确定。本文研究了氧化钇稳定氧化锆 (YSZ) 的光谱，并进行了局部结构调控，以确定晶体在高温下颜色不稳定的原因。两种不同ZrO ₂ –Y ₂ O _{3的蓝色立方氧化锆样品}在空气气氛中将比例在 800 °C 下加热 1 小时。比较了不同配比的立方氧化锆晶体加热前后的结构、光学特性和电子结合能。样品 A 变色，而样品 B 保持不变。_{Y 2} O ₃的量样品 A 中的稳定剂含量是样品 B 的三倍。加热后样品 A 吸收截止边的显着变化表明晶体带隙减小。晶体的高温变色归因于氧空位的增加。XPS、XRD 和 Raman 的研究表明加热后样品 A 中的氧空位浓度增加。热释光光谱表明加热后氧空位缺陷的深度和缺陷浓度的增加。

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Local structure regulation and spectroscopy study of blue cubic zirconia

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 research areas for zirconia crystal materials. Nonetheless, the reason for the discoloration of blue cubic zirconia at high temperatures was not determined. In this paper, the spectra of yttria-stabilized zirconia (YSZ) were investigated, and the local structure regulation was carried out to determine the reasons for the colour instability of crystals at high temperatures. Two kinds of blue cubic zirconia samples with different ZrO₂–Y₂O₃ ratios were heated at 800 °C for 1 hour in an air atmosphere. The structure, optical characteristics, and electron binding energy of cubic zirconia crystals with different ratios before and after heating were compared. Sample A changed colour, while sample B remained unchanged. The amount of Y₂O₃ stabilizers in sample A is three times higher than that in sample B. The significant shift in the absorption cut-off edge of sample A after heating indicates a reduction in the crystal bandgap. The high temperature discoloration of the crystals is attributed to an increase in oxygen vacancies. The study of XPS, XRD, and Raman showed an increase in the concentration of oxygen vacancies in sample A after heating. The thermoluminescence spectra indicate the depth of oxygen vacancy defects and the increase in defect concentration after heating.

更新日期：2023-02-03

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