W.Z. Zhu et al.: Dielectric behavior of Mn-doped morphotropic phase boundary composition in the PZN–BT–PT
FIG. 11. ln(1/⑀Ј − 1/⑀Јmax) versus ln(T − T ) at 10 kHz for compositions with different levels
m
of doping: (a) 1 mol%, (b) 3 mol%, (c) 5 mol%, (d) 8 mol%.
2
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1, 749 (1998).
IV. CONCLUSIONS
1) Perovskite structure can be achieved in the fabri-
8
(
3. J.C. Ho, K.S. Liu, and I.N. Lin, J. Mater. Sci. 28, 4497 (1993).
cation of Mn-doped MPB composition of the PZN–BT–
PT system provided that precursor approach is adopted.
Addition of Mn stabilizes the rhombohedral phase against
the tetragonal one, resulting in the displacement of the MPB
region toward the PT-rich side at room temperature.
4. J. Kelly, M. Leonard, C. Tantigate, and A. Safari, J. Am. Ceram.
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5
6
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7
8
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2+
(2) Mn doping weakens the frequency dispersion of
Tmax due to the enhanced ferroelectric coupling between
defect dipole pair and polar vector of spontaneous po-
larization. However, the frequency dependence of ⑀Ј is
promoted.
1625 (1998).
9
. W.Z. Zhu, A.L. Kholkin, P.Q. Mantas, and J.L. Baptista, J. Am.
Ceram. Soc. 84, 1740 (2001).
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41 (1989).
(
(3) The diffuseness of phase transition is appreciably
1
1
1
increased by Mn doping. Marked non-Curie–Weiss be-
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3
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2+
in Mn concentration.
ACKNOWLEDGMENTS
2
312 (1999).
One of authors (W.Z. Zhu) is grateful to the Founda-
tion for Science and Technology (FCT) of Portugal for its
financial support (PRAXIS XXI/BPD/16300/98) during
his stay in Portugal.
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