Large Pyroelectric Effect in Relaxor-Based Ferroelectric Pb(Mg_1/3Nb_2/3)O₃-PbTiO₃ Single Crystals

Authors: Feng, Zuyong¹; Zhao, Xiangyong²; Luo, Haosu²

Source: Journal of the American Ceramic Society, Volume 89, Number 11, November 2006 , pp. 3437-3440(4)

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Abstract:

The pyroelectric properties of (1−x)Pb(Mg_1/3Nb_2/3)O_3−xPbTiO₃ (PMN−xPT) single crystals with various compositions and orientations have been investigated using a dynamic method. Excellent pyroelectric performances can be achieved in 〈111〉-oriented rhombohedral PMN−xPT (0.24≤x≤0.30) crystals, where the measurement direction corresponds to the polar axis of the crystal. At room temperature, the pyroelectric coefficient and the detectivity figure of merit (F_d) for the 〈111〉-oriented PMN-0.28PT single crystal are 8.55 × 10⁻⁴ C·(m²·K)⁻¹ and 9.89 × 10⁻⁵ Pa^−1/2 (100 Hz), respectively, superior to those of the widely used pyroelectric materials. They are also weak temperature dependent and nearly independent of frequency. These outstanding pyroelectric performances make the single crystals a promising candidate for uncooled infrared detectors and thermal imagers.

Document Type: Research article

DOI: http://dx.doi.org/10.1111/j.1551-2916.2006.01264.x

Affiliations: 1: Ferroic Physics Group, National Institute of Materials Science, Tsukuba 305-0047, Ibaraki, Japan 2: Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201800, China

Publication date: 2006-11-01