Synthesis of anatase nanoparticles with extremely wide solid solution range and ScTiNbO6 with α-PbO2 structure
Synthesis of anatase nanoparticles with extremely wide solid solution range and ScTiNbO6 with α-PbO2 structure
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DOI：
10.1016/j.jssc.2009.03.020
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发表时间：
2009-06
影响因子：
3.3
通讯作者：
M. Hirano;T. Ito
中科院分区：
文献类型：
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作者：
M. Hirano;T. Ito
在180 ° C水热反应5h制备了具有宽固溶范围（X = 0 - 0.35）的锐钛矿型纳米颗粒ScXTi 1 - 2XNbXO 2。随着铌和钪含量的增加，在X = 0~0.35范围内，晶格常数a0、c0和禁带宽度逐渐线性增加。通过测定溶液中亚甲基蓝（MB）的浓度，评价了它们的光催化活性和吸附性能。X = 0.25-0.30的样品在900 ℃和X = 0.35的样品在750 ℃的空气中热处理时，α相稳定存在。X = 0.25-0.30的样品在900-950 ° C加热后，α-PbO2相和金红石相共存。α-PbO2结构的组成为ScTiNbO6，其阳离子顺序可能与黑钨矿中所见的相似，在900 - 1500 ° C的温度下热处理后，通过锐钛矿型ScTiNbO6的相变，几乎完全以单相存在。
Anatase-type nanoparticles ScXTi1−2XNbXO2with wide solid solution range (X=0–0.35) were hydrothermally formed at 180°C for 5h. The lattice parameters a0and c0, and the optical band gap of anatase gradually and linearly increased with the increase of the content of niobium and scandium from X=0 to 0.35. Their photocatalytic activity and adsorptivity by the measurement of the concentration of methylene blue (MB) that remained in the solution in the dark or under UV-light irradiation were evaluated. The anatase phase existed stably up to 900°C for the samples with X=0.25–0.30 and 750°C for that with X=0.35 during heat treatment in air. The phase with α-PbO2structure and the rutile phases coexisted in the samples with X=0.25–0.30 after heated at temperatures above 900–950°C. The α-PbO2structure having composition ScTiNbO6with possibly some cation order similar to that seen in wolframite existed as almost completely single phase after heat treatment at temperatures 900–1500°C through phase transformation from anatase-type ScTiNbO6.