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Novel ferroelectricity in polar semiconductor ZnO by Li-substitution
Description
Ferroelectricity in Li-substituted II-VI semiconductor ZnO ceramics was studied. A ferroelectric phase transition temperature T/sub c/ is 370 K in hot-pressed ceramics synthesized by the spark plasma sintering method, although the previous cold-pressed ceramics showed a relative low T/sub c/ (330 K). The Rietveld analysis of X-ray powder diffraction pattern showed R/sub WP/=7.4%, u=0.3821 (3) for Zn (Li) and x=0.09 at 293 K in Zn/sub 1-x/Li/sub x/O hot-pressed ceramics. The ferroelectricity in Zn/sub 1-x/Li/sub x/O results from small structural distortion (of order 10/sup -3/ /spl Aring/) induced along the polar c-axis by substitutional Li atoms, instead of the host Zn atoms in the wurtzite structure.
Journal
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- ISAF 1998. Proceedings of the Eleventh IEEE International Symposium on Applications of Ferroelectrics (Cat. No.98CH36245)
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ISAF 1998. Proceedings of the Eleventh IEEE International Symposium on Applications of Ferroelectrics (Cat. No.98CH36245) 475-478, 2002-11-27
IEEE