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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 23, Number 10
BKCSDE 23(10)
October 20, 2002

Title	Ferroelectric Properties of Substituted Aurivillius Phases SrBi2Nb2-xMxO9 (M=Cr, Mo)
Author	S.-Y. Moon, K. S. Choi, K. W. Jung, H. Lee, D. Jung
Keywords	Aurivillius phase, Ferroelectric property, Dielectric constant
Abstract	Partially doped Aurivillius phases SrBi₂Nb_{2-xM_xO₉ (M=Cr and Mo) were successfully synthesized and characterized. The extent of the substitution was limited at ~20 mole % because of the size differences between Nb⁵⁺ and Cr⁶⁺ , and between Nb⁵⁺ and Mo⁶⁺ . When the amount of substitution exceeded ~20 mole%, the phases began to collapse and the second phases were made. The dielectric constants of substituted compounds were enlarged nevertheless Cr or Mo is substituted. The increment is bigger in the Mo substituted compound than in the Cr doped one although the Nb(Cr)O₆ octahedra could be more strongly distorted than the Nb(Mo)O₆ octahedra since the ionic size difference between Nb⁵⁺ and of Cr⁶⁺ is much bigger than that between Nb⁵⁺ and Mo⁶⁺ . Consequently, the dielectric constant of the substituted Aurivillius phase Bi₂A_n-1B_n-xM_xO_3n+1 depends on the extent of distortion of the BO₆ octahedra and more strongly on the polarizability of the metal.}
Page	1463 - 1466
Full Text	PDF

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