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Dielectric and Pyroelectric Properties of 〈111〉‐Oriented Fe‐Doped 0.62Pb(Mg 1/3 Nb 2/3 )O 3 –0.38PbTiO 3 Single Crystals
Author(s) -
Wan Xinming,
Zhao Xiangyong,
Luo Haosu,
Chan H. L. W.,
Choy C. L.
Publication year - 2005
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2005.00585.x
Subject(s) - pyroelectricity , materials science , doping , dielectric , figure of merit , dielectric loss , single crystal , crystal (programming language) , dopant , analytical chemistry (journal) , permittivity , pyroelectric crystal , mineralogy , crystallography , ferroelectricity , optoelectronics , chemistry , chromatography , computer science , programming language
Fe‐doped 0.62Pb(Mg 1/3 Nb 2/3 )O 3 –0.38PbTiO 3 (PMN–0.38PT) single crystals were grown by a modified Bridgman technique. Two kinds of single crystals with different iron ion molar ratios, (i) 0.2 mol% and (ii) 1.0 mol%, were obtained. The effect of doping iron ions on the dielectric and pyroelectric properties of the 〈111〉‐oriented PMN–0.38PT single crystals was examined. The temperature of the permittivity maximum ( T m ) exhibits no dispersion behavior and decreases with increasing doping concentration. The dielectric loss of the 0.2 mol% Fe‐doped PMN–0.38PT single crystal is much lower than that of the high dopant content crystal (1.0 mol%) and undoped crystal, which makes it possess excellent pyroelectric performance. By a dynamic method, the measured pyroelectric coefficient and detectivity figure of merit ( F D ) of 0.2 mol% Fe‐doped PMN–0.38PT single crystal are 439 μC/m 2 ·K and 56.3 μPa −1/2 , respectively, both better than those of widely used pyroelectric single crystal LiTaO 3 . The results imply that the single crystal is a promising candidate for infrared detectors and other pyroelectric applications. The mechanism of doping effect was also discussed based on the principles of crystal chemistry.