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Crystal structure refinement, dielectric and magnetic properties of A-site and B-site co-substituted Bi0.90Nd0.10Fe1-xTixO3 (x=0.00, 0.02, 0.05 & 0.07) ceramics
Journal of Alloys and Compounds ( IF 6.2 ) Pub Date : 2018-04-06
Manisha Yadav, Ashish Agarwal, Sujata Sanghi, R.K. Kotnala, Jyoti Shah, Tanvi Bhasin, Muskaan Tuteja, Jogender Singh

Nd and Ti co-doped Bi0.90Nd0.10Fe1-xTixO3 (x = 0.00, 0.02, 0.05 & 0.07) ceramics were prepared via conventional solid state reaction method. The crystal structure was investigated by X-ray diffraction at room temperature. The XRD data was further studied by Rietveld refinement using Full prof suite which revealed the structural transformation from rhombohedral (R3c) into triclinic (P1) phase. Low values of R factors and χ2 showed good agreement between experimental and refined intensities. The analysis of Raman spectra is consistent with the earlier reported data. Dielectric response of all the prepared samples was analyzed in the frequency range 100 Hz to 7 MHz at different temperatures. All the samples exhibited dispersion in dielectric constant values at lower frequencies and became nearly constant at higher frequencies. With Ti substitution, the dielectric constant became stable at higher frequencies due to suppression of oxygen vacancies. The temperature variation of dielectric constant and tanδ displayed sharp anomalies in the vicinity of Neel temperature. Impedance spectroscopy disclosed appearance of grain contributions in the prepared samples. Magnetic characterization was performed by using Vibrating sample magnetometer upto a field of 5 kOe at room temperature. The hysteresis loop exhibited inherent antiferromagnetism with a weak ferromagnetism. The maximum remnant magnetization (Mr) is observed for Bi0.90Nd0.10Fe0.95Ti0.05O3 is 3.15 memu/g and the corresponding value of coercive field is 130.65 Oe.



中文翻译:

A位和B位共取代Bi 0.90 Nd 0.10 Fe 1-x Ti x O 3(x = 0.00、0.02、0.05和0.07)陶瓷的晶体结构细化,介电和磁性

通过常规固态反应方法制备了Nd和Ti共掺杂的Bi 0.90 Nd 0.10 Fe 1-x Ti x O 3(x = 0.00、0.02、0.05和0.07)陶瓷。在室温下通过X射线衍射研究晶体结构。Rietveld精炼使用Full prof suite进一步研究了XRD数据,揭示了从菱形(R 3 c)到三斜(P1)相的结构转变。的[R因子和χ低值2在实验强度和精细强度之间显示出良好的一致性。拉曼光谱分析与早期报道的数据一致。在不同温度下,在100 Hz至7 MHz的频率范围内分析了所有制备样品的介电响应。所有样品在较低频率下均表现出介电常数值的分散,而在较高频率下几乎变为常数。用Ti替代,由于抑制了氧空位,介电常数在较高频率下变得稳定。介电常数和tanδ的温度变化在Neel温度附近显示出明显的异常。阻抗光谱法揭示了在制备的样品中晶粒贡献的外观。通过使用振动样品磁力计在室温下达到5 kOe的磁场来进行磁性表征。磁滞回线表现出固有的反铁磁性和弱铁磁性。最大剩余磁化强度(M对于Bi 0.90 Nd 0.10 Fe 0.95 Ti 0.05 O 3观察到r)为3.15 memu / g,矫顽场的相应值为130.65 Oe。

更新日期:2018-04-07
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