The charge state of titanium ions in Pd-doped Ti:CMAS glass and glass-ceramics
The charge state of titanium ions in Pd-doped Ti:CMAS glass and glass-ceramics
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Pd掺杂Ti:CMAS玻璃和微晶玻璃中钛离子的电荷态
DOI：
10.1111/jace.14791
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发表时间：
2017
影响因子：
3.9
通讯作者：
Jain, Himanshu
中科院分区：
文献类型：
--
作者：
Golovchak, Roman;Davis, Mark J.;Vullo, Paula;Astashkin, Andrei;Nichols, Laura;Ingram, Adam;Jain, Himanshu
我们通过X射线光电子能谱、电子顺磁共振、正电子湮没寿命谱和荧光光谱研究了Ti的电荷状态在导电CMAS-TiO 2-Pd玻璃和玻璃陶瓷的电子性质和结构中的作用。这些研究表明，在形成气体的还原气氛中失透的玻璃陶瓷中，Ti 3+离子的浓度至多为约0.1重量%;其他玻璃或玻璃陶瓷样品均未显示出可测量的Ti 3+水平。在液氮温度下在母体玻璃和在空气中获得的玻璃陶瓷中观察到的荧光通过涉及Ti 4+离子和氧气环境的UV诱导的电荷转移过程来解释。X射线光电子能谱数据与先前在不含Pd和掺杂Pd的Ti：CMAS玻璃陶瓷中鉴定出的金红石、钙长石、透辉石和钛酸盐晶相相关。
We have investigated the role of charge state of Ti in the electronic properties and structure of electrically conductive CMAS‐TiO2‐Pd glass and glass‐ceramics by X‐ray photoelectron spectroscopy, electron paramagnetic resonance, positron annihilation lifetime spectroscopy, and fluorescence spectroscopy. These studies suggest the concentration of Ti3+ions was, at most, ~0.1 wt% in glass‐ceramics devitrified in the reducing atmosphere of forming gas; no other glass or glass‐ceramic samples exhibited measurable levels of Ti3+. The observed fluorescence at liquid nitrogen temperature in parent glasses and glass‐ceramics obtained in air is explained by UV‐induced charge‐transfer processes involving Ti4+ions and oxygen surroundings. The X‐ray photoelectron spectroscopy data are correlated with rutile, anorthite, diopside, and titanite crystalline phases identified in Pd‐free and Pd‐doped Ti:CMAS glass‐ceramics earlier.