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Phase transition behavior and electrical properties of (1− x)Bi0.5Na0.5TiO3–x(Na0.53K0.44Li0.04)(Nb0.88Sb0.08Ta0.04)O3 lead-free ceramics

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Title: Phase transition behavior and electrical properties of (1− x)Bi0.5Na0.5TiO3–x(Na0.53K0.44Li0.04)(Nb0.88Sb0.08Ta0.04)O3 lead-free ceramics
Authors: Wang, Hong-Qiang1, Dai, Ye-Jing1 daiyj04@gmail.com, Shen, Zhu-Rui1 ericshen1124@yahoo.com.cn, Zhang, Xiao-Wen2
Source: Journal of the European Ceramic Society. Jul2012, Vol. 32 Issue 8, p1481-1484. 4p.
Subjects: Phase transitions, Electric properties of metals, Titanium oxides, Antimony, Piezoelectric materials, Ceramic materials, Molecular structure
Abstract: Abstract: (1− x)Bi0.5Na0.5TiO3–x(Na0.53K0.44Li0.04)(Nb0.88Sb0.08Ta0.04)O3 (BNT–xNKLNST) with x =0–0.10 lead-free piezoelectric ceramics were prepared by a solid state method, and the structure and electrical properties were investigated in this study. It is found that a morphotropic phase boundary (MPB) of rhombohedral (R) and tetragonal (T) phase exists in the range of 0.03≤ x ≤0.05 and the structure changes to paraelectric phase when x >0.07. The samples with x =0.05 exhibit improved electrical properties owing to the formation of MPB, which are as follows: piezoelectric constant d 33 =120pC/N, remnant polarization P r =39.4μC/cm2 and coercive field E c =3.6kV/mm. These results indicate that the enhanced piezoelectric properties for BNT can be achieved by forming the coexistence of R and T phase. [Copyright &y& Elsevier]
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Abstract:Abstract: (1− x)Bi0.5Na0.5TiO3–x(Na0.53K0.44Li0.04)(Nb0.88Sb0.08Ta0.04)O3 (BNT–xNKLNST) with x =0–0.10 lead-free piezoelectric ceramics were prepared by a solid state method, and the structure and electrical properties were investigated in this study. It is found that a morphotropic phase boundary (MPB) of rhombohedral (R) and tetragonal (T) phase exists in the range of 0.03≤ x ≤0.05 and the structure changes to paraelectric phase when x >0.07. The samples with x =0.05 exhibit improved electrical properties owing to the formation of MPB, which are as follows: piezoelectric constant d 33 =120pC/N, remnant polarization P r =39.4μC/cm2 and coercive field E c =3.6kV/mm. These results indicate that the enhanced piezoelectric properties for BNT can be achieved by forming the coexistence of R and T phase. [Copyright &y& Elsevier]
ISSN:09552219
DOI:10.1016/j.jeurceramsoc.2012.01.008