microwave network analysis
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2018 ◽  
Vol 16 (1_suppl) ◽  
pp. 93-100 ◽  
Author(s):  
Jinpei Lin ◽  
Zeping Guo ◽  
Mei Li ◽  
Qing Lin ◽  
Kangling Huang ◽  
...  

Background: A multiferroic material can simultaneously show two or more basic magnetic properties, including ferromagnetism, antiferromagnetism, and ferroelectricity. BiFeO3 is a multiferroic material with a rhombohedral distorted perovskite structure. Doping can reduce the volatility of Bi and greatly improve the magnetoelectric properties of BiFeO3. Methods: To investigate the influence of the doping content we used the following analytical methods: X-ray powder diffraction (XRD), scanning electron microscopy (SEM), microwave network analysis (PNA-N5244A), and the Superconducting Quantum Interference Device (Quantum Design MPMS) test. Results: With the increase of Ca2+ concentration in the solution, the grain size of Bi1- xCa xFeO3 becomes smaller, showing the role of Ca2+ ions as the dopant for fine grains. The calcination temperatures are the major causes for the saturated magnetization. The residual magnetization ( Mr) and the coercive force ( Hc) decrease linearly with the increase of x value, and due to the effect of Ca2+ substitution at Bi3+ sites, which causes the valence change of Fe and/or the oxygen vacancies. Conclusions: The XRD result indicates that the diffraction peak emerges with the increase of Ca2+ and the main diffraction peak achieves a high angle. The best calcining temperature is 600 °C, and the morphology is very dependent on the calcining temperature.


2016 ◽  
Vol 24 (3) ◽  
pp. 2466 ◽  
Author(s):  
Rui Cheng ◽  
Li Xia ◽  
Chaotan Sima ◽  
Yanli Ran ◽  
Jalal Rohollahnejad ◽  
...  

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