Relationship between Ferroelectric Performance, Crystal and Electronic Structures in SrBi2(Ta1-xNbx) 1.95M0.05O9 (M = W, Mo)

Naoto Kitamura, Ryo Muroi, Takanori Itoh, Yasushi Idemotoa

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SrBi2(Ta1-xNbx)1.95M 0.05O9 (x = 0~1;M=W and Mo) were investigated from the viewpoint of ferroelectric properties, crystal and electronic structures. By P-E hysteresis-loop and dielectric-constant measurements, it was demonstrated that both the W- and Mosubstituted samples exhibited higher remanent polarization and lower Curie temperature regardless of the Ta:Nb ratio. The Rietveld technique with the neutron diffraction data indicated that the tilting angles of the (Ta,Nb,M)-O6 octahedra and the spontaneous polarization increased by the W and Mo substitutions. Such a change in the crystal structure explained well the behavior of the ferroelectric property. From electron-density analysis using synchrotron X-ray diffraction patters, it was suggested that the bond strength within the (Ta,Nb,M)-O6 octahetron became weaker slightly by the partial replacements of W and Mo.

Original languageEnglish
Pages (from-to)N211-N216
JournalECS Journal of Solid State Science and Technology
Issue number11
Publication statusPublished - 18 Nov 2013

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