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首页> 外文期刊>RSC Advances >Effect of samarium and vanadium co-doping on structure, ferroelectric and photocatalytic properties of bismuth titanate
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Effect of samarium and vanadium co-doping on structure, ferroelectric and photocatalytic properties of bismuth titanate

机译：mar钒共掺杂对钛酸铋结构，铁电和光催化性能的影响

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We performed a systematic analysis of the structure, ferroelectric and photocatalytic activities of Sm and V co-doped Bi4Ti3O12 (SBVT) ceramics. The formation of 3-layered Aurivillius structure and chemically induced strain of SBVT were analyzed by SEM and HRTEM studies. From the results of structural refinements, temperature dependent XRD and Raman spectra we found that SBVT has a distorted orthorhombic structure and transforms to tetragonal in the temperature range of 475–600 °C. Raman modes of Bi sites experience the phase transition earlier compared to torsional bending modes of BO6 octahedra. From the results of polarization and piezoelectric strain measurements, we found that SBVT exhibits superior ferroelectric characteristics as well as improved S33 (0.02 × 10?3) compared to other rare-earth doped Bi4Ti3O12 materials reported in the literature. SBVT exhibited fatigue endurance up to 108 switching cycles. Such a behavior is attributed to the structural distortions due to the smaller ionic radius of Sm3+ and reduced oxygen vacancies. Local piezoresponse measurements demonstrated imprint characteristics of ferroelectric domains. Furthermore, we assessed the photocatalytic (PC) activity of SBVT – for the first time – in the gas–solid phase, monitoring the degradation of nitrogen oxides (i.e. NO + NO2). Results demonstrated that SBVT was photocatalytically active in the solar spectrum, being able to degrade NOx at ppb level concentration, and exhibited a very stable PC activity (five consecutive PC runs), proving itself suitable for reuse.
机译：我们对Sm和V共掺杂的Bi 4 Ti 3 的结构，铁电和光催化活性进行了系统分析。 small> O 12 （SBVT）陶瓷。通过SEM和HRTEM研究分析了三层Aurivillius结构的形成和SBVT的化学诱导菌株。从结构改进的结果，取决于温度的XRD和拉曼光谱中，我们发现SBVT具有畸变的正交结构，并在475-600°C的温度范围内转变为四方晶。与BO 6 八面体的扭转弯曲模式相比，Bi位置的拉曼模式经历了相变更早。通过极化和压电应变测量结果，我们发现SBVT表现出优异的铁电特性以及改进的 S 33 （0.02×10 < small> ？3 ）与其他稀土掺杂Bi 4 Ti 3 O 12 材料。 SBVT表现出高达10 8 切换周期的耐疲劳性。这种行为归因于Sm 3 + 的较小离子半径和降低的氧空位，从而导致结构变形。局部压电响应测量表明铁电畴的压印特性。此外，我们首次评估了气固相中SBVT的光催化（PC）活性，监测氮氧化物的降解（ ie NO + NO 2 ）。结果表明，SBVT在太阳光谱中具有光催化活性，能够在ppb级浓度下降解NO x ，并且具有非常稳定的PC活动（连续五次PC运行），证明自己适合重用。

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