Hall effect and dielectric properties of Mn-doped barium titanate

✍ Scribed by Xiang Wang; Min Gu; Bin Yang; Shining Zhu; Wenwu Cao

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 110 KB
• Volume: 66
• Category: Article
• ISSN: 0167-9317
• DOI: 10.1016/s0167-9317(02)01011-0

✦ Synopsis

BaMn Ti O (0 # x # 0.01) ceramics have been prepared using a sol-gel method. The Hall coefficient,

leakage conductance and dielectric constant were measured. The Hall effect confirms that the charge carriers of the ceramics are electrons, and the electronic concentration n 5 1/ueRu decreases with increasing Mn 31 41 concentration. We propose that Mn and Mn substitution of Ti can partially trap the conductance electrons.

The dielectric constant e of the pellets exhibited a peak at T |110 8C upon heating and the height and position 1 c 21 of this peak depends on the Mn concentration. The Mn incorporated in the oxygen octahedron of the BaTiO 3 41 unit cell is in a more centered position than Ti and may, therefore, modify considerably the ferroelectric property.