Magnetic and dielectric properties of – hybrid composite ceramics

✍ Scribed by Chao-Chao Zhou; Bing-Cheng Luo; Ke-Xin Jin; Xian-Sheng Cao; Chang-Le Chen

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 626 KB
• Volume: 150
• Category: Article
• ISSN: 0038-1098
• DOI: 10.1016/j.ssc.2010.05.005

✦ Synopsis

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(1 -x) BiFeO 3 -xLa 1/3 Sr 2/3 MnO 3 hybrid composite ceramics (x = 0, 0.1, 0.2, 0.3) are prepared by a solid state sintering method. X-ray diffraction shows that the hybrid composite ceramics mainly consist of BiFeO 3 and La 1/3 Sr 2/3 MnO 3 and no middle phase products. The study of the M-H curve reveals that BiFeO 3 is antiferromagnetic with residual magnetism (0.068 emu/g) due to canting of the spin. By introducing La 1/3 Sr 2/3 MnO 3 , weak antiferromagnetism is obviously improved. For composites with x = 0.1, the largest magnetization is observed. On the other hand, with increasing La 2/3 Sr 1/3 MnO 3 , magnetization declines. Additionally, as the content of La 2/3 Sr 1/3 MnO 3 increase, the dielectric constant is found to be increased, while dielectric loss is found to be reduced. By applying a static magnetic field, a large magnetodielectric (MD) effect is obtained. The largest MD effect is obtained at x = 0.3. The observed large MD effect can be explained in terms of magnetic field induced polarization.