Mhadhbi Noureddine, Jabeur Wiem, Guesmi Ahlem, Houas Ammar, Ben Hamadi Naoufel, Naïli Houcine
Laboratory Physico Chemistry of the Solid State, Department of Chemistry, Faculty of Sciences, University of Sfax BP 1171 Sfax 3000 Tunisia
University of Monastir, Preparatory Institute for Engineering Studies of Monastir Monastir 5019 Tunisia.
RSC Adv. 2023 Oct 16;13(43):30168-30175. doi: 10.1039/d3ra04777f. eCollection 2023 Oct 11.
A series of P - doped LaMoO phases with different concentrations of P were prepared using conventional solid-state reactions. The formation of phase-pure P-doped LaMoO has been monitored by powder X-ray diffraction, thermal analysis, conductivity measurements, Raman, and FT-IR absorption techniques. The structure and lattice parameters of LaMoPO are obtained from Rietveld refinement. The effect of substituting P for Mo reveals that the phase transition which occurs in LaMoO around 560 °C disappears when > 0.02, as demonstrated by thermal analysis. Pure P-doped phases with monoclinic structure (α-form, the space group 2) were observed for the concentration of optically active ions up to = 0.02. When the concentration of P ions is higher, a cubic structure (β-form, the space group 23) starts to appear. However, up to the concentration of = 0.03 of the P ion a mixture of the monoclinic and cubic phases has been observed. From infrared and Raman analysis it is confirmed that different vibration modes arise from the vibration of molybdenum-oxygen bands. Mo-O bond lengths are also found to be independent of P-doping.
采用传统固相反应法制备了一系列不同磷浓度的磷掺杂钼酸镧相。通过粉末X射线衍射、热分析、电导率测量、拉曼光谱和傅里叶变换红外吸收技术监测了纯相磷掺杂钼酸镧的形成。通过Rietveld精修获得了LaMoPO的结构和晶格参数。用磷取代钼的效应表明，热分析表明，当x>0.02时，LaMoO中在560℃左右发生的相变消失。对于光学活性离子浓度高达x = 0.02的情况，观察到具有单斜结构（α-型，空间群C2）的纯磷掺杂相。当磷离子浓度较高时，开始出现立方结构（β-型，空间群P23）。然而，直到磷离子浓度达到x = 0.03时，仍观察到单斜相和立方相的混合物。通过红外和拉曼分析证实，不同的振动模式源于钼-氧带的振动。还发现Mo-O键长与磷掺杂无关。
