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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Role of oxygen vacancy and Fe-O-Fe bond angle in compositional, magnetic, and dielectric relaxation on Eu-substituted BiFeO_3 nanoparticles
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Role of oxygen vacancy and Fe-O-Fe bond angle in compositional, magnetic, and dielectric relaxation on Eu-substituted BiFeO_3 nanoparticles

机译：氧空位和Fe-O-Fe键角在Eu取代的BiFeO_3纳米粒子的组成，磁性和介电弛豫中的作用

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The influence of oxygen vacancies on the dielectric relaxation behavior of pure and Eu-substituted BiFeO_3 nanoparticles synthesized by a sol-gel technique has been studied using impedance spectroscopy in the temperature range of 90 °C to 180 °C. The electric relaxation time and activation energy of the oxygen vacancies can be calculated from the Arrhenius equation, and found to be 1.26 eV and 1.76 eV for pure and Eu-substituted BiFeO_3, respectively. Substitution induces structural disorder and changes in the Fe-O-Fe bond angle, leading to alteration of the magnetic properties, observed from magnetic studies and evaluated using Rietveld refinement of the XRD patterns. X-ray photoelectron spectroscopy (XPS) confirms the shifting of the binding energy of the Bi 4f orbital, establishing Eu substitution at the Bi site. Calculation of the area under the Fe~(2+)/Fe~(3+) (2p) and O (1s) XPS spectra gives approximate values of the oxygen vacancies.
机译：氧空位对通过溶胶-凝胶技术合成的纯的和Eu取代的BiFeO_3纳米粒子的介电弛豫行为的影响已在90°C至180°C的温度范围内使用阻抗谱进行了研究。氧空位的电弛豫时间和活化能可以通过Arrhenius方程计算得出，对于纯的和Eu取代的BiFeO_3，分别为1.26 eV和1.76 eV。取代会引起结构紊乱和Fe-O-Fe键角的变化，从而导致磁性变化，这是从磁性研究中观察到的，并使用Rietveld精细化XRD图案进行评估。 X射线光电子能谱（XPS）证实Bi 4f轨道的结合能发生了位移，从而在Bi位点建立了Eu取代基。通过计算Fe〜（2 +）/ Fe〜（3+）（2p）和O（1s）XPS光谱下的面积，可以得出氧空位的近似值。

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