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首页> 外文期刊>Materials Science and Engineering. B, Solid-State Materials for Advanced Technology >Impact of leach on lead vanado-iodoapatite [Pb_5(VO_4)_3I]: An infrared and Raman spectroscopic study
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Impact of leach on lead vanado-iodoapatite [Pb_5(VO_4)_3I]: An infrared and Raman spectroscopic study

机译：浸出对钒钒碘磷铅的影响[Pb_5（VO_4）_3I]：红外和拉曼光谱研究

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摘要

Structural changes in lead vanado-iodoapatite [Pb_5(VO_4)_3I], leached in KOH/KCO_3H buffer solution at 90℃, were investigated using infrared (IR) and Raman spectroscopy. The untreated material shows characteristic phonon bands in three wavenumber regions (50-250, 300-500 and 750-870 cm~(-1)). In comparison with a natural apatite, the replacement of phosphate by vanadium in the apatite structure leads to stretching and bending vibrations of the structural tetrahedra shift to lower frequencies. The leached samples all show extra bands between 3000 and 3600 cm~(-1), characterised by two features: a broad tail and two sharp absorption bands near 3490 and 3538 cm~(-1). The former is attributed to the H_2O species absorbed by the gains or located between grain boundaries, whereas the latter two bands, which have the similar frequencies as those of hydroxyls in fluorapatite, are assigned as OH species which substitutes iodine in the leached materials. The leached samples also show an extra Raman band near 1058 cm~(-1) and IR bands near 1370 and 1420cm~(-1), which are the characteristic vibrations of CO_3 units. The uncorrelated relative intensities between CO_3 and OH bands and the absence of the characteristic C—OH vibrations (near 1017 and 1300cm~(-1)) of the HCO_3 ion in the Raman spectra indicate that hydrogen- and carbon-related species mainly exist in the form of CO_3 and OH rather than HCO_3. CO_3 ions could be incorporated into the tetrahedral sites by substitution of VO_4 (B-type substitution) as a result of the leached-induced loss of vanadium.
机译：用红外（IR）和拉曼光谱研究了在90℃的KOH / KCO_3H缓冲溶液中浸出的钒铅-碘磷灰石[Pb_5（VO_4）_3I]的结构变化。未经处理的材料在三个波数区域（50-250、300-500和750-870 cm〜（-1））显示出特征声子带。与天然磷灰石相比，磷灰石结构中的钒替代磷酸盐会导致结构四面体向较低频率的拉伸和弯曲振动。浸出的样品均显示出3000至3600 cm〜（-1）之间的额外谱带，具有两个特征：宽尾巴和3490和3538 cm〜（-1）附近的两个尖锐吸收带。前者归因于被增益吸收的H_2O物种或位于晶界之间，而后两个能带与氟磷灰石中的羟基频率相似的频率被指定为OH物种，替代了沥滤材料中的碘。浸出样品还显示出在1058 cm〜（-1）附近有一个额外的拉曼带，在1370和1420cm〜（-1）附近有IR带，这是CO_3单元的特征振动。拉曼光谱中CO_3和OH谱带之间不相关的相对强度以及HCO_3离子缺乏特征性的C-OH振动（在1017和1300cm〜（-1）附近）表明，氢和碳相关的物种主要存在于的形式为CO_3和OH，而不是HCO_3。由于浸出诱导的钒的损失，CO_3离子可以通过VO_4的取代（B型取代）而掺入四面体位点。

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