Hall effect and dielectric properties of Mn-doped barium titanate
2003; Elsevier BV; Volume: 66; Issue: 1-4 Linguagem: Inglês
10.1016/s0167-9317(02)01011-0
ISSN1873-5568
AutoresXiang Wang, Min Gu, Bin Yang, Shining Zhu, Wenwu Cao,
Tópico(s)Microwave Dielectric Ceramics Synthesis
ResumoBaMnxTi1−xO3 (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=1/|eR| decreases with increasing Mn concentration. We propose that Mn3+ and Mn4+ substitution of Ti can partially trap the conductance electrons. The dielectric constant ϵ1 of the pellets exhibited a peak at Tc∼110 °C upon heating and the height and position of this peak depends on the Mn concentration. The Mn2+ incorporated in the oxygen octahedron of the BaTiO3 unit cell is in a more centered position than Ti4+ and may, therefore, modify considerably the ferroelectric property.
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