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Sol–gel synthesis, structural, optical and magnetic characterization of Ag3(2+x)PrxNb4?xO11+δ (0.0 ≤ x ≤ 1.0) nanoparticles

机译:溶胶 - 凝胶合成,结构,光学和磁性表征Ag3(2 + x)prxnb4 xO11 +δ(0.0≤x≤1.0)纳米颗粒

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In this work we have studied the optical and magnetic properties of sol–gel synthesized nanocrystalline Ag _(3(2+ x )) Pr _( x ) Nb _(4? x ) O _(11+ δ ) ( x = 0.0, 0.50 and 1.0; S1–S3) samples. The structural, morphological, optical and magnetic properties of the nanoparticle were investigated using X-ray diffraction, scanning electron microscopy with energy-dispersive X-ray profile, optical absorbance spectroscopy, vibrating sample magnetometer and electron paramagnetic resonance spectroscopy. The X-ray diffraction results reveal the formation of single-phase monoclinic lattice structure with P 2/ m in all the samples. The optical absorption spectra indicates charge transfer from O ~(2?) to Nb ~(5+) of niobium and ~(3) H _(4) to ~(1) D _(2) , ~(3) P _(0) , ~(3) P _(1) and ~(3) P _(2) of praseodymium (4f ~(2) ) ions. Magnetic studies reveal that the samples exhibit ferromagnetism at room temperature. EPR lineshapes of the nanoparticles S1–S3 at 77 and 300 K show a broad unresolved isotropic lineshapes due to the relaxation process.
机译:在这项工作中,我们研究了溶胶 - 凝胶合成纳米晶Ag的光学和磁性,(3(2+ x))Pr _(x)Nb _(4≤x)O _(11+δ)(x = 0.0 ,0.50和1.0; S1-S3)样品。使用X射线衍射研究纳米颗粒的结构,形态,光学和磁性,扫描电子显微镜,具有能量分散X射线曲线,光学吸收光谱,振动样品磁力计和电子顺磁共振光谱。 X射线衍射结果揭示了在所有样品中具有p 2 / m的单相单斜晶格结构的形成。光学吸收光谱将来自O〜(2?)至Nb〜(5+)的电荷转移到铌〜(3)H _(4)至〜(1)d _(2),〜(3)P _ (0),〜(3)P _(1)和〜(3)P _(2)镨(4F〜(2))离子。磁性研究表明样品在室温下表现出铁磁性。纳米颗粒S1-S3在77和300K处的EPR线接收显示出由于弛豫过程而宽的未分解各向同性线。

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