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Material Sciences 2024
稀土Eu离子掺杂TiO2的结构变化研究
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Abstract:
TiO2是典型两性氧化物，是一种性能较好的白色颜料。本文采用拉曼散射方法研究了压力下Eu离子掺杂的TiO2/Eu3+材料的结构变化特性。在低压力区，Eg和A1g两个Raman振动模式峰随压力变化系数为0.095 nm/GPa和0.074 nm/GPa。在高压力区间，金红石结构的A1g模式逐渐减弱，特征峰546 nm峰位随压力的变化行为在15.7 GPa出现明显变化，且线性变化系数变为0.03 nm/GPa。金红石结构TiO2/Eu3+在15.7 GPa发生由金红石结构到斜锆石结构的压致结构转变。相变压力高于文献中报道，在掺杂进入少量其他尺寸的离子可以对其基质晶格结构压力稳定范围进行调制。
TiO2 is a typical amphoteric oxide and a high-performance white pigment. Raman scattering method is used to study the structural change characteristics of Eu ion doped TiO2/Eu3+ materials under pressure. In the low pressure region, the two Raman vibration peaks of Eg and A1g exhibit pressure variation coefficients of 0.095 nm/GPa and 0.074 nm/GPa. In the high pressure range, the A1g mode of the rutile structure gradually weakens, and the characteristic peak at 546 nm exhibits a significant change at 15.7 GPa, with another linear variation coefficient of 0.03 nm/GPa. The rutile structure of TiO2/Eu3+ undergoes a pressure induced structural transition from rutile structure to baddeleyite structure at 15.7 GPa. The phase transition pressure is higher than reported pressure, and doping with a small amount of other sized ions can modulate the pressure stability range of its matrix lattice structure.
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